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Emerson Process Management 7951 - page 1
Micro Motion ® 7951 Signal Converte r Operating Manual HB511020, Rev. A November 2007 7951 Signal Converter ( With gas software 1020) Micro Motion ® 7951 Klippon Connector Model D-Type Connector Model Introduction : The Micro Motion ® 7951 Signal Converter can be used for dual-channel/stream gas applications. Software Version : 1020 – Gas Appl ...
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Copyright © 1997 - 2007 Micro Motion, Inc. pursues a policy of continuous development and product improvement. The information contained in this document is, therefore, subject to change w ithout notice. To the best of our knowledge, the information contained in this document is accurate. However, Micro Motion cannot be held responsible for any er ...
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Static precautions Some parts of the instrument (such as circuit boards) may be damaged by static electricity. Therefore, when carrying out any work which involves the risk of static damage to the instrument, the instructions show the following notice: CAUTION While carrying out this procedure, y ou must w ear an earthed w rist strap at all times t ...
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CONTENTS 1. About this manual 1.1 1.1 What this manual tells you 1.1 1.2 Who should use this manual 1.1 1.3 Software versions covered by this manual 1.1 2. Getting started 2.1 2.1 What this chapter tells you 2.1 2.2 What the examples show y ou 2.1 2.3 If you need help… 2.1 2.4 Example 1: 7951 with a 7810/11/12 Gas density transducer 2.2 2.5 Examp ...
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5.7 Step 4: Fitting the 7951 5.4 5.8 Step 5: Making the external connections 5.6 5.9 Step 6: Earthing the instrument 5.6 5.10 Step 7: Connecting the power supply 5.8 6. The keyboard, display and indicators 6.1 6.1 What this chapter tells you 6.1 6.2 The layout of the front panel 6.1 6.3 What the display show s 6.2 6.4 How the buttons w ork 6.2 6.5 ...
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9.5 Analogue 0% and 100% values 9.2 9.6 Live and set data 9.2 9.7 Units which the 7951 can display 9.3 10. Configuring the instrument using wizards 10.1 10.1 What this chapter tells you 10.1 10.2 Wizards : Configuring the easy w ay 10.1 10.3 Wizard Maps : Conventions used 10.1 10.4 Quick-start Guide ( Set-up Wizards ) 10.3 10.5 Set-up wizard select ...
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12. Routine operation 12.1 12.1 What this chapter tells you 12.1 12.2 The menu diagrams 12.1 12.3 Security and passw ords 12.8 12.4 How y ou can edit displayed information 12.8 12.5 Making data values Live or Set 12.10 12.6 Changing the units which are display ed 12.11 12.7 Changing fallback values 12.11 12.8 Changing the time and date 12.11 12.9 C ...
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Appendix D Units and conversion factors D.1 Appendix E Data tables E.1 Appendix F Calculations and theory F.1 ...
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Chapter 1 About this manual Page 1.1 1. About this manual 1.1 What this manual tells you This manual tells you how to install, configure, operate, and service the instrument. In addition, some information is given to help you identify and correct some of the more common faults which may occur. However, since repairs are done by changing suspected f ...
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Chapter 1 About this manual Page 1.2 ...
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Chapter 2 Getting started Page 2.1 2. Getting started 2.1 What this chapter tells you If you are new to the Micro Motion ® 7951 Signal Converter, the worked examples in this chapter can help you to become familiar with the installation and configuration procedures . The examples are: x Example 1: 7951 with a 7810/11/12 (See page 2.2) x Example 2: ...
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Chapter 2 Getting started Page 2.2 2.4 Example 1: 7951 with a 7810/11/12 gas density meter About this example This NON-HAZARDOUS (SAFE) A REA ONLY INSTALLATION † example shows you how to connect either a 7810, 7811 or 7812 gas density meter to the 7951, and then uses the “Dens ity 1” wizard to configure the system. In this example, the “Den ...
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Chapter 2 Getting started Page 2.3 Signal - 0V Power Signal + +24V Power 1 2 3 4 Klippon D-type PL5/9 PL5/1 PL5/10 PL5/2 SK6/22 SK6/14 SK6/24 SK6/15 7951 7812 SIG A SIG B Figure 2.2: Safe area wiring for a 7812 (3-w ire arrangement) Turn on the power 3. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine whi ...
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Chapter 2 Getting started Page 2.4 Figure 2.3: Prime Line density display C A L I B R A T I O N C E R T I F I C A T E 7812xx GAS DENSITY METER Serial No: Cylinder No: Amplifier No: Calibration Dat e: 123456 123456 123456 14JUL97 PRESSURE TESTED TO 3 75 BAR DENSITY CALIBRATION FOR NITRIGEN AT 2 0 DEG C Based on Pre ssure- Temperat ure-Densi ty Data ...
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Chapter 2 Getting started Page 2.5 View the Multi- view display 26. Press the MULTI-VIEW DISPLAY button. The display looks similar to that in Figure 2.5 , although values shown may vary. 27. Pressing the DOWN-ARROW button results in the message: “Invalid Multiview Page” This appears because it is possible to h ave more than one Multiview page a ...
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Chapter 2 Getting started Page 2.6 2.5 Example 2: 7951 with a 3096/3098 Gas Specific Gravity Meter About this example This example shows you ho w to connect a 3096/3098 to the 7951 and then use the “SG 1” wizard to configure the system. In this example, the “SG 1” wizard is used to configure a connection as follows: x A single 3096/309 8 is ...
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Chapter 2 Getting started Page 2.7 Sig + Neg (24v) Power + 1 2 3 Klippon D-type PL5/9 PL5/5 PL5/6 PL5/10 SK6/22 SK6/18 SK6/19 SK6/24 7951 3096/3098 Barrier as defined in the latest 3096/3098 specification 1 2 3 4 (0v) Power - Signal - Signal + Intrinsically Safe Earth Figure 2.7: Hazardous area wiring for a 3096/3098 Turn on the power 3. Turn on th ...
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Chapter 2 Getting started Page 2.8 Figure 2.8: Prime Specific Gravity display View the Multivie w display 22. Press the MULTI-VIEW DISPLAY button. The display looks simil ar to that in Figure 2.9 , although values and titles shown may vary. V Density 0.000 a b c d From Multi-view key V Invalid Multi view Page a b c d Figure 2.9: Multi-View display ...
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Chapter 2 Getting started Page 2.9 2.6 Example 3: 7951 with a mA-type temperature transmitter About this example This example shows you ho w to connect a mA-type temperature transmitter to the 7951, and the n use the “Temperature” wizard to configure the system. In this example, the “Temperature” wizard is used to configure connections as f ...
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Chapter 2 Getting started Page 2.10 Turn on the power 4. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignor e any flashing alarm lights which may appear. Go to the wizards menu 5. Press the MENU button to go to Page 1 of the Main Menu (if you aren ...
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Chapter 2 Getting started Page 2.11 Figure 2.11: Line temperature data display End of Worked Example 3 ...
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Chapter 2 Getting started Page 2.12 2.7 Example 4: 7951 with a mA-type pressure transmitter About this example This example shows you ho w to connect a mA-type pressure transmitter to the 7951, and then use the “Pressure” wizard to configure the system. In this example, the “Pressure” wizard is used to configure a connection as follows: x A ...
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Chapter 2 Getting started Page 2.13 Turn on the power 4. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignor e any flashing alarm lights which may appear. Go to the wizards menu 5. Press the MENU button to go to Page 1 of the Main Menu (if you aren ...
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Chapter 2 Getting started Page 2.14 2.8 Example 5: 7951 with a PRT-type temperature transmitter About this example This example shows you ho w to connect a PT100 transmitter to the 7951, and then use t he “Temperature” wizard to configure the system. In this example, the “Temperature” wizard is used to configu re a connection as follows: x ...
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Chapter 2 Getting started Page 2.15 Turn on the power 4. Turn on the power to the system. The system goes through a Power On Self Test (POST) routine which takes less than 30 seconds. When it is finished, ignore any flashing alarm lights which may appear. Go to the wizards menu 5. Press the MENU button to go to Page 1 of the Main Menu (if you aren? ...
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Chapter 2 Getting started Page 2.16 ...
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Chapter 3 About the Micro Motion ® 7951 Page 3.1 3. About the Micro Motion ® 7951 3.1 Background The Micro Motion ® 7951 is designed to meet the demand for a reliable, ver satile, user-friendly and cost-effective instrument for liquid and gas metering. It has a Motorola 68332 32-bit microprocessor and surface-m ounted circuit board components so ...
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Chapter 3 About the Micro Motion ® 7951 Page 3.2 3.3 Physical description of the 7951 The main body of the 7951 is a one-piec e aluminium extrusion which provides the best possible EMC protection. The keyboard and display is attached to the front of the instrument and all electrical and communications connectors are mounted on the Rear Panel . The ...
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Chapter 3 About the Micro Motion ® 7951 Page 3.3 3.5 Typical installations The diagram below illustrates a typical installation utilising the 7951 . PT TE DT 4-20mA 4-wire PRT Frequency MODBUS communications to and from host com p uter Part of pipeline T ransducers and transmitte rs PT TE Static pressure transducer T emperature elemen t (PRT) DT D ...
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Chapter 3 About the Micro Motion ® 7951 Page 3.4 For example, for a 7951 Dual-Channel Gas Signal Converter , the software version number is 511020 . You can find the software version number in two ways: 1. It is printed on a label at the rear panel of the 7951 . 2. It is written into the menu structure – see Chapter 12. ...
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Chapter 4 What you can connect to a 7951 Page 4.1 4. What you can connect to a 7951 The information in this chapter has been moved to Appendix C. ...
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Chapter 4 What you can connect to a 7951 Page 4.2 ...
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Chapter 5 Installing the system Page 5.1 5. Installing the system 5.1 What this chapter tells you This chapter gives full instructions for installi ng the 7951 . It does not go in to detail ab out how to install any periphera l devi ces (such as trans ducers, comp uters or printers) which are conn ected to t he 7951 . For this in formation you must ...
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Chapter 5 Installing the system Page 5.2 5.5 Step 2: Unpacking the instrument Remove the instrument from its packing and examine it to see if any items are loose or if i t has been damaged in transit. Check that all items on the shipping list are present. If any items are missing or if the equipment is damaged, contact your supplier immediately for ...
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Chapter 5 Installing the system Page 5.3 5.6 Step 3: Setting DIP-switches Some types of connection may requir e DIP-switches to be set. 5.6.1 Analogue Input DP -switches The 7951 has two blocks of DIP-s witches on the Processor Board, as shown in Figure 5.1: x SW1 switches – select whether each input is 4-20 mA or PRT. x SW2 switches – not used ...
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Chapter 5 Installing the system Page 5.4 5.7 Step 4: Fitting the 7951 Caution: You must not fit the 7951 where it may be subjected to extreme conditions or be lia ble to damage . For further in formation abou t the environmental co nditions within which it can operate, see Appendix C. 1. Firstly, referring to Figure 5.2, cut out an aperture in the ...
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Chapter 5 Installing the system Page 5.5 You can mount the clamp so that it is fixed permanently or can be removed later, if requir ed. If you want the clamp to be fixed permanently, carry out Steps 3 - 8. If you want to be able to remove the clamp, carry out Steps 9 - 12. If the clamp is to be fixed permanently: 1. Make sure that the face of the f ...
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Chapter 5 Installing the system Page 5.6 5.8 Step 5: Making the external connections 1. Refer to the documentation supplied with the external equip ment to see if you have to carry out any spec ial procedures when connecting them to the 7951 . Take special notice of any information about safety requirements in hazardous ar eas, and complying with E ...
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Chapter 5 Installing the system Page 5.7 7951 7951 7951 7951 2 7951 7951 7951 7951 OK 2 PL1 SK3 7951 1 ( 1 ) Earth stud on 7951 rear panel (D-t ype and Klippon). ( 2 ) Cabinet earth or other suitable metal structure. Figure 4.7: Multiple 7951 chassis earthing (through studs and earth leads) ...
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Chapter 5 Installing the system Page 5.8 5.10 Step 7: Connecting the power supply Plug the dc power connector into plug PL1 and s witch on the power. The instrument goes through the following Power-On-Self-Test (POST) routine: x The display sho ws a sequence of characters or patterns to prove that all elements of the display are working. There is a ...
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Chapter 6 The keyboard, display and indicators Page 6.1 6. The keyboard, display and indicators 6.1 What this chapter tells you This chapter tells you: • How the front panel is laid out. • What the buttons and indicators do. • What characters you can display. 6.2 The layout of the front panel Figure 6.1 shows the layout of the keyboard. The d ...
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Chapter 6 The keyboard, display and indicators Page 6.2 6.3 What the display shows The display can show the following information: • Numerical data in floating point, exponent or integer formats. • Text descriptors. • Units of measurement (if applicable). • Status of parameters i.e. set, live, failed or fallback (if applicable). • Alarm a ...
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Chapter 6 The keyboard, display and indicators Page 6.3 MAIN MENU Moves you straight to page 1 of the top-level menu. INFORMATION MENU Takes you to a special menu providing infor mation on alarms, events, flow status and 795x operating mode. PRINT MENU Takes you to a special menu dealing with data archiving and printing of reports. MULTI-VIEW You c ...
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Chapter 6 The keyboard, display and indicators Page 6.4 In VIEW mode, the buttons that you can use are: ‘ a ’ button On/off toggle for displaying the parameter’s unique i dentification number (location ID). This is displayed to the left of the status indication on line 4. ‘ b ’ button Puts the 795x into EDIT mode so that you can edit the ...
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Chapter 6 The keyboard, display and indicators Page 6.5 ENTER If you are satisfied with the changes y ou have made, press ENTER to accept the chang es and go back to VIEW mode. (The ‘ b ’ also does this.) CLEAR This clears a line of text. BA CK If you do not want to keep the changes you have made, press the BA CK button to abandon the changes a ...
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Chapter 6 The keyboard, display and indicators Page 6.6 DOT Inserts a decimal point. EXPONENT Use this button if you want to show numbers in exponent form. ‘ b ’ button If you want to accept the changes you have made, press the ‘ b ’ . The 795x will then revert to VIEW mode. (Note: ENTER also does this.) ENTER If you want to accept the chan ...
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Chapter 6 The keyboard, display and indicators Page 6.7 6.8 The 795x character set You can use any of the 96 characters shown below as part of your display. Figure 6.3: The 795x character set 6.9 LED indicators Security Indicator This LED shows the present security level of the system. • RED FLASHING – The instrument is at Calibration level. ? ...
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Chapter 6 The keyboard, display and indicators Page 6.8 6.10 Summary of button functions The tables here provide a vis ual summary of the function for each button when in variou s modes. Table 6.1: Summary of w hat the buttons do (Part 1 of 2 ) ...
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Chapter 6 The keyboard, display and indicators Page 6.9 Table 6.2: Summary of w hat the buttons do (Part 2 of 2 ) ...
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Chapter 6 The keyboard, display and indicators Page 6.10 ...
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Chapter 7 The menu system Page 7.1 7. The menu system 7.1 What this chapter tells you Before you can configur e and operate the 795x , you should have some understanding of how the menu system works. The menus are simple and intuitive, so they should present no problems to the average user. This chapter gives you a general tour , showing how to nav ...
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Chapter 7 The menu system Page 7.2 Each menu choice is associated with a lettered button on the front panel - a , b , c or d . For example, a menu choice on Display Line 1 is associated with the a button. Similarly, a menu choice on Displa y Line 2 is associated with the b button, and so on. If there is no menu choice on a display line, the associa ...
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Chapter 7 The menu system Page 7.3 At the lowest levels in each branch of the menu system, there are parameter screens . Figure 7.4 shows how to navigate to the parameter screen for <MeterRun Temperature>. Al l parameter screens fe ature a solid, black, triangular shaped ma rk in the bottom-left corner of Display Line 4. Note : Full details a ...
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Chapter 7 The menu system Page 7.4 Returning to the top-level menu again, there are menu choices that are common to all sof tware versions (Figure 7.5). In addition, you’ll encounter them in subsequ ent chapters. All other menu choices on the Main Menu (e. g. “Flow rates”) are for operators to quickly find final measurements and other calcula ...
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Emerson Process Management 7951 - page 55
Chapter 8 Alarms Page 8.1 8. Alarms 8.1 Alarms 8.1.1 Alarm types The types of alarms that are detected and recorded are: System alarms , caused by one or more of: • Power failure. • Battery low (if a battery is fitted). • Watchdog. • RAM checksum failure. • ROM checksum failure. Input alarms , caused by one or more of: • Failure of anal ...
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Chapter 8 Alarms Page 8.2 8.1.3 Ho w alarms are received and stored When a new alarm is received, the appropriate indi cator LED on the front panel starts flashing. If the indicator is already flashing beca use of a previous alarm, it continues to do so. If the indicator is already ON (steady), it starts to flash. Information about alarms is stored ...
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Chapter 8 Alarms Page 8.3 8.1.5 What the Alarm Status Display tells you A typical Alarm Status Display is shown in Figure 8.2. The display lists, for each type of alarm (System, Input or Limit), the number of alarms that are live and new . • New alarms are alarms that have been recei ved but not accepted. • Live alarms are alarms that refer to ...
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Chapter 8 Alarms Page 8.4 • Acceptance indication This is only shown for those entries that have not been accepted. When the entry is accepted, the i ndicator disappears. • Other entries indication An up-arrow symbol shows that there are entries before the present one, whilst a down-arrow symbol shows that there are others after . If the entry ...
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Chapter 8 Alarms Page 8.5 Dens comp. limit Limit Comparison limit of density ‘A’ and ‘B’ measurements exceeded Additional alarm message letters: ‘L’=Line density, ‘B’=Base density Dens temp A limit Limit [H]igh, [L]ow or [S]tep limit for DensityA temperature exceeded Dens temp B limit Limit [H]igh, [L]ow or [S]tep limit for DensityB ...
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Chapter 8 Alarms Page 8.6 ...
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Chapter 9 Additional facilities Page 9.1 9. Additional facilities 9.1 What this chapter tells you You can also specify features such as: • Fallback values and modes to be used if live inputs fail. • Limits which, if exceeded, trigger alarms. • The units in which the calculat ions are performed and are d isplayed. The following sections give m ...
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Emerson Process Management 7951 - page 62
Chapter 9 Additional facilities Page 9.2 9.4 Fallback values and modes A fallback value is used as a temporary substitute for a parameter if a live input (i.e., the transducer, transmitter or wiring), which is normally used to calculate the parameter, should fai l. A fallback must have one of the following modes: • None The system uses whatever v ...
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Emerson Process Management 7951 - page 63
Chapter 9 Additional facilities Page 9.3 9.7 Units which the 795x can display The 795x can displ ay data values with many different units, as listed in T able 9.1 below. However, when communicating with other devices, the data is always sent using the standard units. In Table 9.1, the following definitions are used: • Standard units: Units which ...
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Chapter 9 Additional facilities Page 9.4 ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.1 10. Configuring your instrument by using wizards 10.1 What this chapter tells you This chapter features complete maps of all the configuration wizards. Each map shows all the possible routes through a wizard. 10.2 Wizards: Configuring the easy way Wizards are configuration tools whi ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.2 "Option n" "Option 1" "Option 2" Heading Option 1 Option 2 Option n An item prompt that appears with the name of the item along with programmable properties - a value, units of measurement and present status. Edit properties and then press the enter key ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.3 10.4 Quick-start Guide ( Set-up Wizards ) Wizard Measurement Task Page Density 1 • Gas density m easurement (nominated as density ‘A’) from a single transducer that is connected to “Density input 1”. 10.6 Density 2 • Gas density m easurement (nominated as density ‘B’ ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.4 10.5 Set-up Wizard Selection Map After using the menu to arrive at the wizard sub-menu, as sho wn earlier in Figure 10.1 , a wizard option can be chosen. Selection Procedure 1. Press the b-button to begin the selection process. 2. Use the up/dow n arrow buttons to cycle through all ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.5 10.6 Units Wizard Selection Map After using the menu to arrive at the units wizard sub-menu, as shown earlier in Figure 10.1 , a wizard option can be chosen. Selection Procedure 1. Press the b-button to begin the selection pr ocess. 2. Use the UP/DOWN ARROW buttons to cycle through ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.6 10.7 Density 1 application wizard See note 5 See note 4 See note 3 See note 2 "Yes" "Yes" "Yes" "Yes" "No" "No" "No" Appears for "Fallback value" only See note 1 "No" "No" 'b&apo ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.7 "None" Route returns to : "Edit Density Limits & Fallback " prompt (on previous page) unless VOS correction has also been selected. VOS "Temp" From "Part 1" page Density A corrections (Selection) None Temp and VOS VOS Temp A1 Transducer A ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.8 10.8 Density 2 application wizard See note 5 See note 4 See note 3 See note 2 "Yes" "Yes" "Yes" "Yes" "No" "No" "No" Appears for "Fallback value" only See note 1 "No" "No" 'b&apo ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.9 "None" Route returns to : "Edit Density B Limits & Fallback " prompt (on previous page) unless VOS correction has also been selected. VOS "Temp" From "Part 1" page Density B corrections (Selection) None Temp and VOS VOS Temp A1 Transducer ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.10 10.9 SG-1 Application Wizard This wizard can be used to configure a s ystem that has a 309 6 gas specific gravity tra nsducer connected to “Density input 3”. Special equations, anal ogue outputs, user alarms and multi-vie w can also be configured here. "Yes" "Yes ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.11 10.10 SG-2 Application Wizard This wizard can be used to configure a s ystem that has a 3096 gas specific gravity transducer connected to “Density input 4”. Special equations, analog ue outputs, user alarms and multi-view can also b e configured here. "Yes" "Yes& ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.12 10.11 SG-1&2 Application Wizard This wizard can be used to configure a s ystem that has 3096 gas specific gravity transducers connected to “Density input 3” and “D ensity input 4”. Special equations, analogue outp uts, user alarms and multi-vie w can also be configured ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.13 10.12 Line density wizard This wizard configures the 795x for getting line densit y ‘A’ and/or line density ‘B’ data. "Temp and VOS" "No" "Yes" "VOS" Appears for "Fallback value" only "No" "None" "Te ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.14 Sequence : Line density ‘B’ measurement "PTZ1" See "Part 1" page "VOS" "Yes" See "Part 1" page "Time Period" See "Part 1" page "No" "Analogue input" "Yes" Line density B selectio ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.15 Sequence : Line density ‘B’ measurement using PTZ1 method Appearance of these prompts depend on selection for "SGERG Selector". N See "Part 1" page "Yes" Edit PTZ1 calculation ? No Yes AGA-NX19 PTZ1 calc select (Selection) SGERG AGA-NX19-mod AGA-NX ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.16 10.13 Base density wizard This wizard configures the 795x for g etting base density ‘A’ and/or base density ‘B’ data. Appears for "Fallback value" only "No" "Auto" Follow "A"+"B" route "B" "A" Base densit ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.17 Sequence : Base density ‘B’ measurement using the PTZ1 method Appearance of these prompts depend on selection for "SGERG Selector". N To "Part 1" page "Yes" Edit PTZ1 calculation ? No Yes AGA-NX19 PTZ1 calc select (Selection) SGERG AGA-NX19-mod AGA ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.18 10.14 Specific gravity wizard This wizard configures the 795x for getting specific gravit y ‘A’ and/or specific gravity ‘B’ data. "No" "Yes" "Analogue input" "Base Density" "Time Period" "Auto" "B" " ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.19 Sequence : Specific gravity ‘B’ measurement from an analogue input "Yes" Turn to "Part 1" page Turn to "Part 1" page "No" Edit SG B analogue input ? No Yes SG B mA Src (Selection) mA input 1 mA input 2 mA input 10 SG @ 100% SG @ 0% Input ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.20 10.15 Temperature wizard This wizard configures the 795x for g etting line temperature ‘A’ and/or densit y temperature ‘A’ and/or density temperature ‘B’ data. From "Part 2" page From "Part 2" page Turn "Part 2" page "No" 'b& ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.21 From "Part 1" page Turn to "Part 1" page Turn to "Part 1" page Turn to "Part 1" page Turn to "Part 1" page Appears for "Fallback value" only "No " "No" "Yes" Edit Temperature Limits & Fall ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.22 10.16 Pressure wizard This wizard configures the 795x for getting line press ure and/or atmospheric pressure data. Turn to "Part 2" page Turn to "Part 2" page "No" Note : 'n' is the number of the input channel selected earlier "Yes" ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.23 Sequence : Atmospheric pressure from an analogue input From "Part 2" page "No" "Yes" "No" "Yes" Edit Atmos. Pressure ? No Yes Atmosp input chl (Selection) mA input 1 mA input 2 mA input 10 Analogue input n type (Selection) PT100 inp ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.24 10.17 Transmitter wizard This wizard configures the 795x for getting live CO 2 and/or live N 2 and/or live ener gy data. Turn to "Part 3" page "Cv/m" Turn to "Part 2" page Exit wizard "No" Note : 'n' is the number of the input chann ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.25 Sequence : Live N2 from an analogue input From "Part 1" page "No" "Yes" Live N2 input chl (Selection) mA input 1 mA input 2 mA input 10 Analogue input n type (Selection) PT100 input 0 - 20mA input 4 - 20mA input Input channel n Edit Live N2 Limits & ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.26 Sequence : Live energy value from an analogue input From "Part 1" page "No" "Yes" Live energy input (Selection) mA input 1 mA input 2 mA input 10 Analogue input n type (Selection) PT100 input 0 - 20mA input 4 - 20mA input Input channel n Edit Live Cv/m ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.27 10.18 Special Calculation wizard "2" 'b' key "1" Setup wizard Special Calc. General equ. const A Edit Special equation: 1 2 General equ. const B General equ. const X General equ. const Y General equ. ptr. a General equ. ptr. b General equ. ptr. c Gener ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.28 10.19 Analogue outputs wizard 'b' key "No" "Yes" "Yes" "No" "Yes" Setup wizard Analogue Outputs Edit Analog output 1? No Yes n =1 Return to the next "edit" prompt OR exit wizard if there are no more prompts 0 - 2 ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.29 10.20 Alarms wizard "B" "A" "Y" 'b' key "X" Setup wizard Alarms Edit X User Alarm: Y A B Exit wizard Comp alarm B ptr1 Comp alarm B ptr2 Comp alarm B limit Comp alarm A ptr1 Comp alarm A ptr2 Comp alarm A limit User alarm Y ptr. Use ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.30 10.21 Multi-view wizard 'b' key Setup wizard Multi view Multiview text width Mv page1 line1 text Mv page1 line1 ptr Exit Wizard Default value is 10 Default value is "Density" Default data is Prime Base Density Mv page1 line2 text Mv page1 line2 ptr Default value ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.31 10.22 Full Setup This wizard consists of multiple wizards. "mA input" "Yes" "No" "Yes" "Yes" "No" "Yes" 'b' key Edit Base density ? No Yes Setup wizard Full Setup "Yes" "No" Edit Spe ...
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Chapter 10 Configuring your instrument by using wi zards Page 10.32 ...
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Chapter 11 Configuring by using the menus Page 11.1 11. Configuring by using the menus The recommended way of configuring the 795x is by using wizards, as e xplained in Chapter 10. But you should use the methods given here if: x You want to configure an installation which is very different from the examples sho wn in Chapter 10. x You want to chang ...
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Chapter 11 Configuring by using the menus Page 11.2 11.3 Recommended sequence for configuration It is recommended that you configure items in the following order: 1. Inputs (See Section 11.5). 2. Transducer details (See Section 11.6). 3. Anything else such as Specific Gravity, Energy, Custom Application, Multiview, etc. Do these in the order in whi ...
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Chapter 11 Configuring by using the menus Page 11.3 11.4 What Sections 11.5- 11.18 tell you Each section tells you how to configure one param eter. The format of each section is: x (Where necessary) a statement which tells you what information you must have to configure the parameter. x (Where necessary) a block diagram showing ho w the instrument ...
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Chapter 11 Configuring by using the menus Page 11.4 78123A GAS DENSITY METER SERIAL NO CYLINDER NO AMPLIF IER NO CALIBRATION DATE : nnnnnn : : : DENSITY CALIBRATION FOR NITROGEN AT 20 DEG C (Based on Pressure-T emperature-Density Data in IUP AC tables) O DENSITY [KG/M3] PERIODIC TIME [uS] n nnn.nnn USER GA S OFFSET DATA Argon/Methane gas mixture ov ...
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Chapter 11 Configuring by using the menus Page 11.5 11.5 Configuring analogue inputs V a b c d a b c d V Flowmeter details Wizar ds Transducer det ails V Analogue inputs a b c d V Avera ge Input type Va l u e a b c d Analogue input 3 Analogue i nput 4 Analogue input 1 Analogue input 7 Analogue i nput 8 Analogue input 5 V a b c d Analogue input 9 Fr ...
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Chapter 11 Configuring by using the menus Page 11.6 11.7 Configuring transmitter detail FIXED Input data Select source, value and status LIVE Input dat a Analogue input 1 Analogue input 10 PRT PT100 or 4-20mA Un-referred temp CA LCULA TE TEMPERA TURE 0% 100% TEMPERA TURE REFERRAL (Orifice only ) RESUL TS Line T emperature (if limits are exceeded) A ...
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Chapter 11 Configuring by using the menus Page 11.7 FIXED Input data Select source, value and status LIVE Input dat a Analogue input 1 Analogue input 10 PRT PT100 or 4-20mA Un-referred temp CA LCULA TE TEMPERA TURE 0% 100% TEMPERA TURE REFERRAL (Orifice only ) RESUL TS T emperature (if limits are exceeded) AL AR M LIMITS High Low Step Limits FAL L ...
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Chapter 11 Configuring by using the menus Page 11.8 Select value and status RESUL TS LIVE Input dat a Analogue input 1 Analogue inpu t 10 CA LCULA TE LIMIT S F A LLBA CK 0% 100% Low High (if limits are exceeded) AL AR M 4-20 mA value mode FIXED Inpu t data CO 2 Active CO 2 Va l u es Limi ts Fallbacks Select value and status RESUL TS LIVE Input dat ...
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Chapter 11 Configuring by using the menus Page 11.9 V a b c d Flowmeter deta ils Wizards Transducer details V Analog inpu ts a b c d Flow rat e Line de nsi ty V To t a l i s e r s a b c d V Atmos pressure Line pressure a b c d V Dens B temperature Line tem peratur e a b c d Live CO2 Live N2 T emperature V a b c d V a b c d Range Limits Va l u e Sel ...
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Chapter 11 Configuring by using the menus Page 11.10 11.8 Configuring flowmeter details LIVE Input data Differential press DP MA SS FLOW RA TE CA LCUL A TION ISO 5167 OR AGA 3 AL AR M If limits are exceeded LIMITS FIXED Input data High Low LIVE Input data Prime density Qm VOLUME FLOW R A T E CA L CULA TION RESUL TS Qv Orifice diamete r Pipe diamete ...
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Chapter 11 Configuring by using the menus Page 11.11 FIXE D Input data LIVE Input dat a Main turbi ne frequency Lin K TURBINE LINEA RISA TION K-factor curve METER FAC T O R RESUL TS Qv Tr turbine temp re f CORRECTIONS A A X Factor x 3600 Kt temp corrections Kp press corrections RESUL TS Qg x 3600 LIVE Input dat a Main turbi ne frequency GROSS VOLUM ...
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Chapter 11 Configuring by using the menus Page 11.12 LIVE Input data SG3096 CA LCULA TION Time period A3 Select value and status Analogue inp ut 1 SG Analogue in put 10 SELECT A B PRIME SG DENSITY SELECTION RESUL TS AL AR M If limits are exceeded FIXED input data Specific gravity A Prime s pec ific gravity Specific gravity B Mode V alue A B Comp Hi ...
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Chapter 11 Configuring by using the menus Page 11.13 Flowmeter detail s Wizards Transducer details V Analog inputs a b c d V a b c d Tur b in e K f a ct o r Flowstop th reshold Turbine frequ ency V a b c d V a b c d V a b c d Turb freq hi limit Corrections Turb gross vol K Turbine K curve Error alarm limit Orifice diameter Dynamic viscosi ty Dif f ...
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Chapter 11 Configuring by using the menus Page 11.14 11.9 Configuring flow rate FIXE D Input data LIVE Input dat a Main turbi ne frequency Lin K TURBINE LINEA RISA TION K-factor curve METER FAC T O R RESUL TS Qv Tr turbine temp re f CORRECTIONS A A X Factor x 3600 Kt temp corrections Kp press corrections RESUL TS Qg x 3600 LIVE Input dat a Main tur ...
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Chapter 11 Configuring by using the menus Page 11.15 LIVE Input da ta Mass flow rat e ST A NDA RD VOLUME FLOW RA TE CA L CULA TION RESUL TS AL AR M If limits are exceeded LIMITS Qs RD Air density FIXE D Input dat a High Low LIVE Input data Prime b ase density Mass flow rate ST A NDA RD VOLUME FLOW RA TE CA LCULA TION RESUL TS AL AR M If limits are ...
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Chapter 11 Configuring by using the menus Page 11.16 11.10 Configuring totalisers LIVE Input da ta Gross volume rate Qg (turbine only ) Actual cycle time Actual cy cle time Actual cy cle time Actual cy cle time Actual cycle time Qv Qm Qs Qe To t a l p t r Alarm T urbine 1 error pulses T urbine 2 error pulses RESUL TS Gross volume total V olume tota ...
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Chapter 11 Configuring by using the menus Page 11.17 V a b c d Flowmeter details Wizards T ransducer details V Analog inputs a b c d Flow rate Line densit y V T otalisers a b c d V Pulse output 5 a b c d V Pulse output 3 Pulse output 4 Pulse output 1 a b c d Reset totals Inhibit tota ls Pulse outputs V a b c d V a b c d Standard volume Energy Vo lu ...
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Chapter 11 Configuring by using the menus Page 11.18 11.11 Configuring line densit y LI VE Inp ut d ata 4-20 mA Tim e p e r io d A Ld e n s i t y Dt e m pA / B Lp r e s s SG LIVE Inp ut da ta Line density A/B CA LCULA TE LINE DENSITY FIXED Input data T p Tr ansducer cal ibrat ion SG VOS Trans - ducer ga mma Density cal tem p VOS type Correct- ion s ...
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Chapter 11 Configuring by using the menus Page 11.19 LIVE Input data FIXED Input data Line temperature Line p ressure AG A8 COMPRESSIBILITY CA LCULA TION AGA8 pa ramete rs Tbase Pbase Comp range RESUL TS Z Zbase Molecular mass (M) AL AR M Invalid component % Nitrogen % Carbon dioxide % Hy drogen sulphide % Water % Helium % Methane % Ethane % Propan ...
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Chapter 11 Configuring by using the menus Page 11.20 LIVE Input data FIXED Input data RESUL TS Line temperature Line pressure Prime SG CO 2 N 2 Nx-19 COMPRESSIBILI TY CA LCULA TION Compressib ility Z Zbase Super compressib ility FPV Mg LIVE Input data FIXED Input data RESUL TS Nx-19mod COMPRESSIBILI TY CA LCULA TION Compressib ility Z Zbase Super c ...
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Chapter 11 Configuring by using the menus Page 11.21 LIVE Input data FIXE D Input dat a Line temperature Line p ressure Base densi ty LINEA R INTERPOLA TION COMPRESSIBILITY CA LCULA TION K10 K1 1 K12 K13 Tb ase Pbase RESUL TS Z Zbase Figure 11.22 Calculating linear interpolation compressibility LIVE Input data FIXE D Input dat a Line pressure Diffe ...
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Chapter 11 Configuring by using the menus Page 11.22 V a b c d Flowmeter details Wizards T ransducer details V Analogue input s a b c d Flow rate Line den sity V T otalisers a b c d V (Selection) Line dens pri me sel a b c d V (Uni ts) (Live or set) Prime density val ue a b c d Line de nsity A Line density B Prime value V a b c d V a b c d Va l u e ...
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Chapter 11 Configuring by using the menus Page 11.23 11.12 Configuring base density LIVE Input data LPress LTe m p Z LDensity Select value and statu s RESUL TS Base density LIVE Input data Analogue in put 1 CA LCULA TE BA SE DENSITY FIXE D Input dat a 100% 0% Analogue in put 4 RESUL TS Base density RESUL TS Base density LIVE Input data Zbase M RESU ...
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Chapter 11 Configuring by using the menus Page 11.24 LIVE Input data CA LCULA TE BA SE DENSITY Prime SG Select value and status Analogue in put 1 CA LCULA TE BA SE DENSITY Analogue i nput 10 NX-19 NX-19mod NX-19mod3h Z-SGERG Z-AGA8 Linear interp olation Sele ct PTZ1 PTZ2 Sele ct SELECT A B PRIME BA SE DENSITY SELECTION RESUL TS AL AR M If limits ar ...
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Chapter 11 Configuring by using the menus Page 11.25 V a b c d Flowmeter de tails Wizards Transducer details V Analogue in puts Flow rat e Line density V T otalisers V a b c d Base densit y Specific gr avity V (Selectio n) Base dens prim e sel a b c d V (Units) (Live or set) P r i m eb a s ed e n s i t y a b c d Base density A Base density B Prim e ...
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Chapter 11 Configuring by using the menus Page 11.26 11.13 Configuring specific gravity RESUL TS Specific gravity LIVE Input dat a 3096SG FIXED Input data K0 Tim e P er i od A K2 Select value and status RESUL TS LIVE Input da ta Analogue i nput 1 FIXED Input data 100% 0% Analogue i nput 10 CALCULA TE SPECIFIC GRA VITY Specific gravity RESUL TS LIVE ...
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Chapter 11 Configuring by using the menus Page 11.27 LIVE Input data SG3096 CA LCULA TION Time period A3 Select value and status Analogue inp ut 1 SG Analogue in put 10 SELECT A B PRIME SG DENSITY SELECTION RESUL TS AL AR M If limits are exceeded FIXED input data Specific gravity A Prime s pec ific gravity Specific gravity B Mode V alue A B Comp Hi ...
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Chapter 11 Configuring by using the menus Page 11.28 V a b c d Flowmeter de tails Wizards Transduc er d etail s V Analog inpu ts a b c d Flow rate Line density V T otali sers a b c d V a b c d Base densit y Specific grav ity V (Selecti on) Prime SG sel a b c d V (Live or set) SG prime value a b c d Specific gravity A Specific gravi ty B Prim e valu ...
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Chapter 11 Configuring by using the menus Page 11.29 11.14 Configuring energy mA ENERGY CA LCULA TION FIXED Input data Parameters (see below ) LIVE Input da ta SG CO2 N2 Select value and status Analogue input 1 Analogue i nput 10 4-20 mA Select 0% 100% ISO6976 ENERGY CA LCULA TION AG A5 ENERGY CA LCULA TION Cm Cm/v Cv RESUL TS Energy RD Select Figu ...
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Chapter 11 Configuring by using the menus Page 11.30 V a b c d Flowmeter de tails Wizards T ransduc er details V Analog ue inputs a b c d Flow rate Line de nsity V T otalisers a b c d V a b c d Base densit y Specif ic gravity V (Selectio n) Energy calc selector a b c d V Energy value a b c d Va l u e Energy Custom applic ation From Configure option ...
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Chapter 11 Configuring by using the menus Page 11.31 11.15 Configuring custom applications FIXED In put data RESUL TS User Calculation Typ e 1 SPECIAL EQUA T ION 1 a(b+Xc) de + Y f ) =A + B User calculation T ype 1 SPECIAL EQUA TION 2 FIXED Input data RESUL TS A+Bt+Ct 2 =e User title AB C t User calculation T ype 2 A, B, X, Y a, b, c, d, e, f User ...
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Chapter 11 Configuring by using the menus Page 11.32 11.16 Configuring mA outputs mA output FIXED Input data mA (A NA LOGUE) OUT PUT 0% Mode 100% Pointe r Filter Va l u e s Cycle time Figure 11.36 mA outputs V a b c d Flowmet er details Wizards T ransduc er details V Analog input s a b c d Flow rate Line density V T otalisers a b c d V a b c d Base ...
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Chapter 11 Configuring by using the menus Page 11.33 11.17 Configuring other parameters V a b c d Flowmeter details Wizards Transducer details V Analogue inputs a b c d Flow rate Line density V T otalisers a b c d V a b c d Base density Specific gravity V Period Density Fraction Atmos pressure a b c d V Pressure Differ ential press T emperature a b ...
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Chapter 11 Configuring by using the menus Page 11.34 What the “Other parameters” option does Selecting “Other parameters” brings up the following options: x Display formats Lets you specify, for each parameter: T he units which are used, together with the number of decimal places or exponential format for the value. x Ala rm s Alarms are de ...
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Chapter 11 Configuring by using the menus Page 11.35 Passwords and security Securable and non-secure modes The 7951 can work in a non-secure or securable mode . In non-secure mode, anyone can have access to any of the facilities. In securable mode, access to facilities can be protected by passwords. Changing security mode On the 7951 you change the ...
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Chapter 11 Configuring by using the menus Page 11.36 Setting or changing a password This can only be done when the present access level is “Programmer”. From the main menu, select the “Other parameters” option. Next, select the “Security” option. Choose the pass word option (i.e. Programmer, Engineer, Operator or World) you want to set ...
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Chapter 11 Configuring by using the menus Page 11.37 11.18 Configuring Multiview V a b c d Flowmeter details Wizards Transducer details V Analog ue inputs a b c d Flow rat e Line density V T otalisers a b c d V a b c d Base density Com pressibility V Line 2 parameter Line 2 text a b c d V Line 1 text a b c d Display line 3 Display line 4 Display li ...
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Chapter 11 Configuring by using the menus Page 11.38 Configuring Multiview Outline of the procedure for configuring Multiview: Step 1: Decide what text you want to display You almost certainly want each lin e of the Multiview display to sho w the name (possibly in an abbreviated form) of a parameter whose valu e you want to display. Bear in mind th ...
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Dual Channel Gas Signal Converter Operating Manual Page i Molecular Weight of Gas Calculation The molecular weight of gas in the stream can be calculated independently of the compressibility calculations. Index for use with list of associated data XX Molecular Weight Calculation 5 Molecular Weight 4 2 Mass of Air Specific Gravity 'B' Mole ...
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Dual Channel Gas Signal Converter Operating Manual Page ii ...
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Chapter 12 Routine operation Page 12.1 12. Routine operation 12.1 What this chapter tells you This chapter tells you ho w to carry out all those procedures which are a part of the normal operation of the 795x. It does not cover configuration, servicing or repair. These topics ar e dealt with elsewhere in this manual. 12.2 Viewing the data The diagr ...
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Chapter 12 Routine operation Page 12.2 V a b c d a b c d V Line density Flow rat es Base de nsity / S G V Flow tot als a b c d Main Menu Leve l 3 menus Leve l 2 menus V (Unit s) (Live or set) (Selec tion name) a b c d Std vol flo w rate Energ y flow rate Vo l u m e f l o w r a t e Gross flow rate V a b c d V a b c d (Units ) (Selecti on name) (Sele ...
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Chapter 12 Routine operation Page 12.3 V a b c d Line density Flow ra tes Base de nsity / S G V Flow totals a b c d Pressure Raw gas data V Energy a b c d Main Menu Lev el 3 m enus Lev el 2 men us Density B temp Base temp erature Line temperature V a b c d Density B temp Line temperature V a b c d DensB temp reading DensA temp readi ng Line temp re ...
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Chapter 12 Routine operation Page 12.4 V a b c d a b c d V Line density Flow ra tes Base de nsity / S G V Flow totals a b c d Pressure Raw gas data V Energy a b c d V a b c d Main Menu Custom applicati on Health ch eck Level 3 menus L e v e l2m e n u s Propane n-Butane V a b c d (Units) (Gas t ype) V a b c d V a b c d Enter comp data C6+ mode (Stat ...
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Chapter 12 Routine operation Page 12.5 V a b c d Line density Flow ra tes Base de nsity / SG V Flow totals a b c d Pressure Raw gas data V Energy a b c d V a b c d Main Me nu Custom appli cation Health check Lev el 3 menus Lev el 2 men us V Selected DP cell DP value a b c d V T urbine Err ors Turbin e freq. a b c d Time period inputs Analo g inputs ...
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Chapter 12 Routine operation Page 12.6 a b c d V Lev el 3 menus Level 2 menus V Ethane Methane a b c d To t a l s Norma lise gas data V a b c d V a b c d Propane i-Butane n-Butane V a b c d n-Hexane n-Hepta ne i-Pentane V a b c d V a b c d V a b c d V a b c d n-Dec ane n-Nona ne Helium n-Octane Live inputs Argon Orif expand fa ctor V el of approach ...
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Chapter 12 Routine operation Page 12.7 V a b c d Line densi ty Flow rat es Base de nsity / SG V Flow totals a b c d Press ure Raw gas data V Energy a b c d V a b c d Main Menu Custom applicatio n Health che ck Lev el 2 me nus Enter passwor d V a b c d Actual cycle time System idle time Time and date V a b c d T ag num ber Software v ersion Tim e Pa ...
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Chapter 12 Routine operation Page 12.8 12.3 Security and passwords For more information about setting and changing passwords, and security in general, refer to chapter 10. 12.4 How you can edit displayed information The figure shows a typical display show ing information about the inputs and outputs. a b c d V Channel through which the data is pass ...
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Chapter 12 Routine operation Page 12.9 12.6 Changing the units which are displayed To change the displaye d units: 1. Go to the menu which displays the parameter, its value and units. 2. Press the c-button . The name of the unit currently in use shifts to the left of the display. 3. Press the UP-A RROW or DOWN-ARROW button to scroll through the lis ...
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Chapter 12 Routine operation Page 12.10 12.11 Printed reports The two types of report The 795x can print out reports which give you information a bout the state of the system. There are two types of report: • Current report This shows the data currently stored in a list of up to 20 locations which you specify. • Alarm log report This shows the ...
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Chapter 12 Routine operation Page 12.11 How to print a report 1. Referring to the diagram, select “Print reports”. 2. Select to print either an Alarm Log or Current Report. (There is a third selection - “Idle” - which lets you leave the menu without a report bein g printed.) The report is printed immediately. Some typical reports CURRENT RE ...
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Chapter 12 Routine operation Page 12.12 ...
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Chapter 13 Routine ma intenance and fault-finding Page 13.1 13. Routine maintenance and fault finding 13.1 Cleaning the instrument You can use a cloth or sponge and water clean the outside of the instrume nt. Do not use caustic cleaning agents or abrasive materials. 13.2 Fault finding Although the instrument is designed to be extr emely reliable it ...
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Chapter 13 Routine ma intenance and fault-finding Page 13.2 Is the trans mitter receiv ing power from the 795x ? Is the 795x configur ed corre ctly ? Is the tra nsmi tter sending current to the 795 x ? Has it ever been displayed ? YES YES YES YES 795x's Connec tor/ Power Suppl y Board is prob ably faulty Correct the configuration The 795x&apos ...
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Chapter 13 Routine ma intenance and fault-finding Page 13.3 Has the fuse in the 795x blown ? Is the security LED on the 795x lit ? Is the power to the 795x ON ? YES YES 795x's Connec tor/ Power Supp ly Board is pro bably fault y NO NO NO Is the 795x's suppl y voltage within spec ? T urn the power ON Replace the 795x's Connector/Po we ...
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Chapter 13 Routine ma intenance and fault-finding Page 13.4 ...
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Chapter 14 Removal a nd replacement of parts Page 14.1 14. Removal and replacement of parts Warning: • Electricity is dangerous and can kill. Discon nect the power supply before making any connections or dis-assembling the 7951 . 14.1 Front Panel Assembl y 1. Undo and remove the four screws which secure the Bezel to the case. Withdraw the Front P ...
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Chapter 14 Removal a nd replacement of parts Page 14.2 14.3 Switch Panel 1. Remove the Front Panel Assembly as explained in Section 14.1 2. Undo the four screws and washers which attach the display to the bezel. Remove the display. 3. Un-solder the flexi cable from the key switch. Remove the spring clip from the switch then withdraw the switch from ...
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Chapter 14 Removal a nd replacement of parts Page 14.3 14.5 Power supply board 1. Undo and remove the four screws which secure the Bezel to the case. Withdraw the Front Panel Assembly to the limits of the connecting wiring then lay it on top of the case. 2. Pull the Power Supply Board forwards so that it disengages from the connector at the back of ...
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Chapter 14 Removal a nd replacement of parts Page 14.4 14.8 Back-up battery 1. Ensure that the unit is disconnected from all power supplies. 2. Ensure that a new battery (CR2430) and a thin edged, non-conductive implement are within easy reach. 3. Undo the six captive screws which attach the front panel assembly to the case. 4. Carefully lift the f ...
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Chapter 14 Removal a nd replacement of parts Page 14.5 14.9 Rear Panel Assembl y Warning: It is strongly recommended that in order to en sure continued compliance to EMC di rectives, you do not attempt to remove the rear panel assemb ly, but return the instrument to the factory. The instructions given below should only be carried out if it is absol ...
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Chapter 14 Removal a nd replacement of parts Page 14.6 14.10 Mother Board Warning: It is strongly recommended that in order to en sure continued compliance to EMC di rectives, you do not attempt to remo ve the rear panel assembl y, b ut return the in strument to the factory. 1. Remove the Rear Panel Assembly as described i n Section 14.9. 2. Referr ...
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Chapter 15 Assembly drawing and parts list Page 15.1 15. Assembly drawing and parts list 15.1 What the drawing and parts list tell you The drawing and parts list sho w those parts of the 7951 which you can obtain as sp ares. To identify an item: 1. Find the item on the appropriate assembly dra wing 2. Note the Item Number by the side of it. 3. look ...
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Chapter 15 Assembly drawing and parts list Page 15.2 Figure 15.1: Diagram for identifying and ordering spares ...
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Chapter 15 Assembly drawing and parts list Page 15.3 Item no. Part number Description Quantity 1 79513701 Instrument case 1 2 79513703 Bezel 1 3 79511206 Displ ay assembly 1 4 79510503 Motherb oard assembly 1 5 79510505 79510504 Connector board assembly (Klippon connectors) Connector board assembly (D-type connectors) 1 1 6 79513702 79513702 Rear P ...
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Chapter 15 Assembly drawing and parts list Page 15.4 ...
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Appendix A Glossary Page A.1 Appendix A Glossary A ADC See Analogue to digital converter Address A number whic h uniquely identifies a location . Alarm An indicator which shows when a failure has occurred. Alarms are classified as System, Input or Limit. API American Petroleum Institute Analogue input An input where information is received in analo ...
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Appendix A Glossary Page A.2 Calibration certificate Each transducer is calibrated before it leaves the factory. The details (together with the transducer’s serial number) are recorded on a Calibration Certificate. Calibration constant Among the information given on the calibrati on certificate are some constants (unique to that transducer) which ...
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Appendix A Glossary Page A.3 Degree Brix A unit on an arbitrary scale which can be converted into actual SG values. Used when describing the sugar content of aqueous solutions. Density The measured densit y of the fluid in a pipeline. Differential pressure The difference in pressure at two points in a pipeline. Digital to analogue converter A circu ...
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Appendix A Glossary Page A.4 H Hazardous area An area where there is a risk of fire or explosion. Health check A check that all inputs and dev ices connected to the 7951 are operating normally. Hg The chemical symbol for the element Mercury. Historical log A log of every alarm received by the 7951. Hub A common connection point for devices in a net ...
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Appendix A Glossary Page A.5 L LED See Light-emitting d iode. Light-emitting diode A diode which light up when current flows through it. LED’s are usually used as indicator lights on instruments. Limit Limits are upper and lower values between which a measured parameter is expected to be. If the parameter is outside these limits, it can trigger a ...
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Appendix A Glossary Page A.6 P Pa See Pascal. Pascal The unit of force. 1 Pa = 1N/m 2 Percent mass The percentage that the mass of a substance has compare d to the total mass for a mixture of substances of which it is a part. Periodic time The duration of one cycle of a wave-form, equal to the inverse of the frequency. Platinum resistance thermomet ...
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Appendix A Glossary Page A.7 S Saybolt viscosity A viscosity measured using methods deve loped by the Saybolt company. It is obtained by timing how long the fluid takes to flow out of a cup through a hole of known size. The viscosit y is expressed in units of time. Security code A code or password which a user must key in before being allo wed acce ...
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Appendix A Glossary Page A.8 Transducer A device which converts a physical q uantity (such as temperature or pressure) to a voltage or some other electric al quantity that can be measured and ana lysed. U Upload To receive data or programs from another instrument. (Opposite of Download ). V Viscosity In a liquid, the resistance to that force which ...
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Appendix B Blank wiring schedule Page B.1 Appendix B Blank wiring schedule ...
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Appendix B Blank wiring schedule Page B.2 ...
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Appendix B Blank wiring schedule Page B.3 External connections Name Ty p e Wiri ng colour Signal Comments 795x Instrument Sheet of Wiring schedule Barrier Pin Pin Connector & pin no. Connector & pin no. ...
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Appendix B Blank wiring schedule Page B.4 ...
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Appendix C Technical data for the 7951 Page C.1 Appendix C Technical data for the 7951 C.1 What this Appendix contains • Ordering information – understanding model codes. • List of different types of external connections you can make to 7951 . • Technical Specification. • Rear panel connector diagrams and pin identit y tables. • Interna ...
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Appendix C Technical data for the 7951 Page C.2 C.3 External connections You can make the following types of external connections to the 7951 : • INPUTS Analog Inputs from devices which monitor continuously changing parameters and tra nsmit analog signals. These include: • PRTs (PT100) • temperature transducers (0/4-20mA) • pressure transdu ...
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Appendix C Technical data for the 7951 Page C.3 • POWER SUPPLIES Inputs d.c. only Outputs d.c. only. These provide po wer within the 7951 and to some other external devices such as transducers. Isolation notes The isolation bet ween the enclosure and all DC power inputs, signal inputs and signal outputs is: 50VDC continuously OR 125VDC for less t ...
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Appendix C Technical data for the 7951 Page C.4 C.5 Specification General Environmental Working temperature 0 to +50°C (-4 to +158°F) Storage temperature -20 to +70°C (-32 to 122°F) Relative humidity Up to 90% non-condensing Bump BS 2011 test E b Vibration Tested to IEC publication 68-2-6, Part II, frequency 10 to 150Hz, maximum acceleration 20 ...
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Appendix C Technical data for the 7951 Page C.5 Inputs Analog Quantity 4 off, each selectable as PRT (PT100) or 4-20mA Options Option for extra 4-20mA inputs: 7951MAA*38*** (Klippon): 4 off 7951MAB*38*** (D-type): 6 off Type 0/4 to 20mA Span selection Unlimited (keyboard selectabl e) Uncertainty ±0.008% of full scale at 25 o C ± 0.001%/°C Resolu ...
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Appendix C Technical data for the 7951 Page C.6 Input trigger level 0.5V RMS (1.2V p-p), Maxim um 30V Input impedance 10k Ω nominal Digital (Status) Quantity 7951MAA****** (Klippon): 6 off 7951MAB****** (D-type): 10 off Options Option for extra status inputs: 7951MAA****** (Klippon): 0 off 7951MAB*38*** (D-type): 8 off Input voltage required 5 to ...
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Appendix C Technical data for the 7951 Page C.7 Pulse Quantit y 7951MAA****** ( Klippon): 3 off 7951MAB****** ( D-type): 5 off Options None Type Open-collector Darlington drivers Output rating 200mA @ 24V with 50% duty cycle Switch voltage 24V maximum Maximum frequency 10Hz Digital (Status) Quantity 7951MAA****** ( Klippon): 7 off 7951MAB****** ( D ...
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Appendix C Technical data for the 7951 Page C.8 Hardware facilities Microprocessor Processor Motorola 68332 Clock speed 24 MHz Computation resolution 64-bit (IEEE 754), fully -floating point maths package. Embedded Real-time operating s ystem. Computation accuracy < 1 part in 10 11 Memory Program storage 2 Mby te FLASH, field upgrad eable using ...
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Appendix C Technical data for the 7951 Page C.9 Alarm annunciation Quantity 3 (one each for Input, System or Limit alarms) Type Red LED Operation Flash indicates ne w alarm condition. Steady indicates accepted alarm. Options None Security Mechanisms 1. Switch located on front panel 2. Software code Indicator Bi-colour LED on the front panel: 1. RED ...
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Appendix C Technical data for the 7951 Page C.10 C.6 Connections C.6.1 7951 D-type Rear Panel Pin PL1 SK1 SK2 SK3 SK4 SK5 SK6 SK7 SK8 1 E Com 2 Rx/Tx+ Com 3 Rx/Tx+ Stat ip 1 Stat op 2 Turb 1 + Ana op 1 PRT 3 pwr + 2 E Com 1 Tx Com 2 Tx Com 3 Tx Stat i p 2 Stat op 3 Turb 1 - Ana op 2 PRT 3 sig + 3 Supply - Com 1 Rx Com 2 Rx Com 3 Rx Stat ip 3 Stat o ...
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Appendix C Technical data for the 7951 Page C.11 C.6.2 7951 Klippon Rear Panel Pin PL1 SK1 SK2 SK3 1 E Com 2 Rx/Tx+ Co m 3 Rx/Tx+ 2 E Com 1 Tx Com 2 T x Com 3 Tx 3 Supply - Com 1 R x Com 2 Rx Com 3 Rx 4 Supply + 5 Com 0V Co m 0V Com 0V 6 7 Com 2 CTS Co m 3 CTS 8 Com 2 RTS Co m 3 RTS 9 Com 2 Rx /Tx- Com 3 Rx/Tx- Pin PL2 PL3 PL4 PL5 PL6 PL7 PL8 PL9 1 ...
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Appendix C Technical data for the 7951 Page C.12 C . 6 Earthing In addition to earthing the chassis, (described in chapter 4), you may have to make extra earth connections in some cases, depending on th e installation requirements. The types of connection can be split into three gro ups, each of which has different earthing requirement s. The group ...
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Appendix C Technical data for the 7951 Page C.13 E E 0v +24V DC Power Protect Ground Group 1 Chassis and instrumentation are earthed together unless you cut the link Group 2 No earthing is required for Status Inputs SK3 Link PL2 Chassis Earth Earth stud Group 3 Connect external earths as required. Pin 1 Pin 9 Protect Ground SK2 Pin 1 Pin 9 Protect ...
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Appendix C Technical data for the 7951 Page C.14 Link SK8 Analogue o/p Common E E 0v +24V DC Power Analogue Power - Protect Ground Protect Ground Protect Ground Protect Ground SK7 Group 1 Chassis and instrumentation are earthed together unless you cut the link Group 2 No earthing is required for Status Inputs Pin 1 Pin 25 SK3 PL1 Chassis Earth Eart ...
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Appendix C Technical data for the 7951 Page C.15 Earthing requirements for group 1 connections only In general, the earthing arrangements are different for large and small installations. (A small installation may possibly consist of just one ins trument.) • If the 7951 is part of a large installation with separate earths for chassis and instrumen ...
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Appendix C Technical data for the 7951 Page C.16 Earthing requirements for group 2 connections only The status inputs do not have to be earthed because the circuitry contains onl y opto-electrical components. Earthing requirements for group 3 connections only These depend on what sort of installation you have and the enviro nment in which it operat ...
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Appendix D Units and conversion factors Page D.1 Appendix D Units and conversion factors The figures in the following table are taken fr om BS 350: Part 1: March 1974: Parameter Imperial units Metric equivalent Length 1 inch 1 foot 25.4 mm 0.3048 m Mass 1 lb 1 ton 0.45359237 kg 1016.05 kg Density 1 lb/ft 3 1 lb/gal 1 lb/US gal 16.0185 kg/m 3 99.776 ...
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Appendix D Units and conversion factors Page D.2 ...
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Appendix E Data tables Page E.1 Appendix E Data tables E.1 The tables Note : The equations used to derive these ta bles are given in Section E.2. Density/temperature relationship of crude oil Temp.(°C) Density (kg/m 3 ) 60 738.91 765.06 791.94 817.15 843.11 869.01 894.86 920.87 946.46 55 742.96 768.98 794.93 820.83 846.68 872.48 898.24 923.95 949. ...
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Appendix E Data tables Page E.2 Platinum resistance law (To DIN 43 760) °C Ohms °C Ohms °C Ohms °C Ohms °C Ohms -220 10.41 -120 52.04 -20 92.13 80 130.89 180 168.47 -210 14.36 -110 56.13 -10 96.07 90 134.70 190 172.16 -200 18.53 -100 60.20 0 100.00 100 138.50 200 175.8 -190 22.78 -90 64.25 10 103.90 110 142.28 220 183.17 -180 27.05 -80 68.28 2 ...
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Appendix E Data tables Page E.3 Velocity of Sound in Liquids The values for a selection of fluids ar e given below. You can obtain further details from reference books such as Tables of Physical and Chemical Constants and some Mathematical Functions by G W C Kaye and T H Laby. Liquid Temperature (t °C) Velocity of Sound ( c ) ms -1 ) Rate of Chang ...
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Appendix E Data tables Page E.4 Water (sea) -4 1430.2 ---- 00 1449.5 ---- 05 1471.1 ---- 15 1507.1 ---- 25 1534.7 ---- o-Xylene 22 1352 ---- ...
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Appendix E Data tables Page E.5 E.2. Equations used to derive data tables Density/temperature relationship The density/temperature relat ionship is: where: t ρ = densit y at line temperature t°C (kg/m 3 ) 15 ρ = density at base temperature 15°C (kg/m 3 ) t Δ = t°C -15°C (i.e. t - base temp erature) 15 α = tangent thermal expansion coeffi ci ...
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Appendix E Data tables Page E.6 For practical purposes, when the liquid volume changes from 0 V t o 1 V as the gauge pressure changes fro m zero (atmospheric) to 1 P , the above equation is simplifie d to: T 1 1 0 P V V 1 » ¼ º « ¬ ª ∂ − = β ISO Document TC 28/SC3/N248, (Generation of Ne w Compressibility Tables for International Use) gi ...
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Appendix F Calculations and theory Page F.1 Appendix F Calculations and theory F.1 The VOS effect on density measurements This sub-section shows how the 795x gas flow computer soft ware works out the velocity of sound factors that are used for correcting line density. Two methods are provided:- 1. Pressure method This method is preferred and is for ...
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Appendix F Calculations and theory Page F.2 Also for both methods, the velocity of soun d of the calibration gas is calculat ed by the 795x using the follo wing equation: Equation F.1#2 : V.O.S. of th e calibration gas Using: () 3 1 2 1 1 * * * ρ ρ ρ D C B A C K K K K C + ¸ ¹ · ¨ © § + + = Where: C C = V.O.S. of the calibr ation gas (in m/ ...
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Appendix F Calculations and theory Page F.3 Table F.1: 'K' Coefficie nt Look-up Values Calibration Gas Density range K A K B K C K D Nitrogen 0-100 Kg/m 3 349.007 -0.530984 E-01 0.595473 E-02 -0.314834 E-04 Nitrogen 0-400 Kg/m 3 348.994 -0.044632 0.297076 E-02 -0.418178 E-05 Methane 0-250 Kg/m 3 442.987 -0.579479 0.623017 E-02 0.0 Argon 0 ...
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Appendix F Calculations and theory Page F.4 Equation F.1#3b : V.O.S. of the measured gas (pure of composition) for S.G. method Using: () ¸ ¸ ¹ · ¨ ¨ © § + − = C G G G C K C C K C * 1 * 1 1 τ τ Where: G C = V.O.S. of the measured gas (in m/s) C C = V.O.S. of the calibration gas (in m/s)……………………..……..{See Equation F.1# ...
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Micro Motion ® 7951 Signal Converter Operating Manual HB511020, Rev. A November 2007 The Emerson logo is a trade mark and service mark of Emerson E lectric Co. Micro Motion is a registered trademark of Micro Motion, Inc. A ll other marks are the property of their respective owners. We reserve the right to modify or improve the designs or specifica ...
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