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Emerson 250 - page 1
3902 Magnolia Rd. Pea rland, Texas 77584 Phone: 281-488-0788 Fax: 281-488-7080 E-mail: magtech @isemagtech.com Website: www.i semagtech.co m LTM – Series Models: LTM-250 and LTM- 350 Magnetostrictive Level Transmitters Instructions & Operation Manual LTM-350_IOM Rev.5 03/11 ...
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Emerson 250 - page 2
Table of Contents Section 1: Warran ty .......... ..... .......... ..... ..... .......... ..... ..... ..... .......... ..... ..... ..... .......... ..... ..... ..... .......... ..... ..... ..... 1 1.0 Warranty..................... ...................... ...................... ...................... ...................... ...................... .... ...
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Emerson 250 - page 3
Table of Contents Section 8: Transmitter Calibration and Troubleshoo ting ..... ..... ..... ..... .......... ..... ..... ..... .......... ..... ..... ..... .......... 28 8.0 Calibration ...................... ...................... ...................... ...................... ...................... ...................... ................. 28 8.1 T ...
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Emerson 250 - page 4
Section 1 Warranty 1.0 Warranty All Magtech product s are warranted against def ects in materials and workmanship for a period of no less than one year from the date of shipment. Th e level gage chamber and process connections are guaranteed for the life of th e tank or vessel to which it is attached. Floats are guaran teed for two years. Magtech w ...
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Emerson 250 - page 5
Section 2 Transmitter Overview 2.0 General Description The LTM-Series are 2-wire electronic field instruments, suitable for installation in hazardous and non-hazardous locations. Tes ting and certification has been obtained fro m different agencies for installa tion in such areas. This instrument is designed to measure and transmit an analog and/or ...
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Emerson 250 - page 6
2.3 Gage Mounted Transmitter The LTM-Series may be strap ped to the outside of the Magtech LG series mag netic level gage. In such an installation, it is used as an accessory transmit ter for the visual le vel gage. The same float used to activate the magnetic gage is also used to activate the magnetostrictive sensor of th e LTM and transmit a dire ...
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Emerson 250 - page 7
A stilling well ma y be used along with the transmitter insid e the tank. Stilling-well is a pipe external to the sens or probe and float encasing the entire assembly pr otecting it from surface agitation or from physical damage du e to the length of the sensor probe. A depicti on of a transmitter with a stilling well is pro vided below. Figure 4. ...
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Emerson 250 - page 8
Section 3 Transmitter Description 3.0 Detailed Description The LTM-Series is an ass embly of two major components: The Sensor Tube Assembly : This is a 5/8” diamet er stainless steel probe , sealed on one end, with the magnetostrictive waveguide in its center. In addition to the magnetostrictive waveguide, the tube also houses th e optional tempe ...
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Emerson 250 - page 9
A high-speed microcontroller is util ized in the design to process and calculate the elapsed time measurement. Accurate crystals are used for the time based to res olve sub-microsecond timing increments. The binary number, equ ivalent to the microseconds of th e echo travel time is used t o calculate the distan ce of the float and a corresponding d ...
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Emerson 250 - page 10
Section 4 Installation 4.0 Gage Mount Installation The LTM-Series can be mounted to the side of a Magtech LG series level gage usin g special mounting brackets and stainles s steel hose clamps. When mounting the transmitter to an LG series gage the active sensor region of the pr obe should fall within the centerline of the process conn ections on t ...
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Emerson 250 - page 11
2. Identify Proper O rientation of Transmitter: There are a few possible orientations of the LTM Series transmitters, th ey are: Figure 9. Possible t ransmitter configurati ons Transmitter A is a standard top mount configuration. Transmitter B is a top mou nt with elbow, usually utilized when there ar e temperature or head room issues. There is als ...
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Emerson 250 - page 12
4. Remote Moun t Electronics Option. Due to process temperature, vibration or accessibility the housing/electronic s of the LTM transmitter can be remote mounted as far as 25 ft. The housing/electronics are sup plied with a pipe- mount bracket that can be mount ed most nearby posts or pipes with hose clamps. The drawing below depict s a gage mounte ...
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Emerson 250 - page 13
4.3 Insulation (against extreme heat/cold) Magtech strongly r ecommends that an experienced Magtech Technician do insula tion of the magnetic level gages at the factory with externally mounted transmitters. If Cryogenic “Hard Skin” cold ser vice type insulation is requ ired, it must be done at the factory due to the custom “TUBE in TUBE” de ...
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Emerson 250 - page 14
Section 5 Field Wiring 5.0 Recommended Loop Wiring The following is the recommended loop wiring. Figure 13. Recommended Lo op Wiring 11 ...
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Emerson 250 - page 15
The following is the Hart Topology. Figure 14. HART Loop Topol ogy Please visit www.hartcomm2. org to learn more about HART Pr otocol. 12 ...
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Emerson 250 - page 16
5.1 Area Classification Installation Safety If the instrument is used as an explosion proof (exp) device then exp conduit mus t be sealed within 18 inches of the termination point – at the instrument. Power must be supplied by an isolated supply. Caution-To reduce the risk of ignition of hazard ous atmospheres, disconnect the device from the supp ...
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Emerson 250 - page 17
Section 6 Transmitter Specifications 6.1 Hazardous Locations / General Ratings CSA and CSAUS: Exp losion Proof: Class I Div. 1 or 2, Grps. B, C, D Class II, Grps. E, F, G Class III T amb -40°C to 85°C (-40°F t o 185°F) ATEX: Ex d: Sira 10ATEX1308X Ex d IIC T5 Gb Ex tb IIIC T100°C IP 66 Db T amb -40°C to 85°C (-40°F t o 185°F) 0344 II 2GD I ...
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Emerson 250 - page 18
Section 7 Menu Structure and Features 7.0 Pushbutton Ope ration The menu structure and pushb utton operation of the LTM series trans mitters is si mple and user-friendly. The electronics module has 3 push buttons (from left to right): ↑ : This button is us ed to increment values and chang e “Yes” to “No” and “No” to “Yes”. ↓ : T ...
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Emerson 250 - page 19
7.1 Menu Structure Main Screen (scrolling): The menu structure has been designed so the end user can make parameter changes relati vely fast and easy. Below is a detail ed description of these menus. The LTM-250/350 LCD is a 2x8 character s creen. The main scr een scrolls between the following parameters: 1. Level (in selected engineering units) 2. ...
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Emerson 250 - page 20
The following is the LTM-250/350 LCD Menu Flow chart Magtech Magtech LTM-250 or LTM-350 SW Rev 1.00.00 HW Rev 1.00.00 Display? Scroll > Level > Intrface* > Temp** > mA Out > % Range SelLngth 30.00 in Lvl Unit in > ft > mm > cm > m Temp Unit** C > F > R > K Sel PV* Level > Interface Sel Alrm FailHigh > FailL ...
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Emerson 250 - page 21
7.1 Menu Structure Cont inued… Description Manufa cturer and Model: Software Revision Status: This is the current software revisi on. Hardware Revision Status: This is the current hardware re vision. Scrolling Option: Allows the user to stop the main menu from scrolling and choose 1 of 5 p ossible parameters: Engineering Units (l evel, interface, ...
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Emerson 250 - page 22
7.1 Menu Structure Cont inued… Description Select PV: This menu allows th e user to select the measurement that controls the trans mitter’s current output (mA). This menu only appears if the interface (2 floats) option is provided . Select Alarm: The following alarm settings can be chosen: “FailHigh” = 21.00mA “FailLow” = 3.50mA “Hold ...
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Emerson 250 - page 23
7.1 Menu Structure Cont inued… Description Rate of Change (Ro C) Filter: This parameter helps ignor e erroneous readings from the transmitt er’s surroundings. If the user knows how fast the level can change in the vessel (i.e. inches per second) then this p arameter should be set at a rate that the level in the vessel cannot suddenly jump to. S ...
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Emerson 250 - page 24
7.1 Menu Structure Continued… Description Trim Digital-Analog-Converter (DAC): These are factory s et parameters used to provide an accurate 4.000mA and 20.000mA. This parameter should not be changed as Magtech uses NIST traceable equipm ent to calibrate our transmitters and only accredited laboratories f or the annual calibration of our equip me ...
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Emerson 250 - page 25
7.2 Features This section will des cribe in more detail some of the LCD Menus and new featu res exclusive to models LTM-250/350. Scrolling Option: When choosing n ot to scroll the main menu the follo wing options can be chosen by pressing the up and down push buttons (exclusively for models LTM-25 0/350) . 1. Display? Display? Display? Display? Dis ...
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Emerson 250 - page 26
7.2 Features (Exclusiv e to the LTM-250/350 models) There is an “advance” m enu incorporated into the LTM-250 /350 models. To access this m enu press and hold the increment ( ↑) button first th en while holdin g the increment button press and h old the enter button for 3 seconds. A new menu will appear on the LCD screen. The following is a fl ...
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Emerson 250 - page 27
7.2 Features (Exclusiv e to the LTM-250/350 models) This section describes the “advance” menus in detail. ComPort: This menu is currently only utiliz ed at the factory and will not assist in any troubleshootin g. When the menu first appears the “No” option is defaulted, si mply press enter to bypass this option. If “Yes” is selected and ...
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Emerson 250 - page 28
7.2 Features (Exclusiv e to the LTM-250/350 models) Please consult factor y before attempting this procedu re. Document transmitter’s serial nu mber for better assistance. 1-point Calibration Procedure (1pt Cal): The following menu is the 1 –point Calibration pr ocedure. This procedure was designed to help th e user get up an d running in an em ...
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Emerson 250 - page 29
7.2 Features (Exclusiv e to the LTM-250/350 models) Field Reversible Transmitter (FlipPrb): An important and key feature of the LTM-250 and LTM-350 Models is the ability to flip (r otate) the entire transmitter 18 0 degrees. This procedure is only for gage mount transmitters with an elbow connection on them. If the trans mitter does not have an elb ...
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Emerson 250 - page 30
7.2 Features (Exclusiv e to the LTM-250/350 models) Change Signal (ChngSgnl): The next and fin al menu in the special features menu is “ChngSgnl” or change signal option. The feature allows the adjustment of the signal being sent down the sens or probe. It can be utilized when one electronics module is being utiliz ed to save settings for vario ...
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Emerson 250 - page 31
Section 8 Transmitter Calibration and LTM Troubleshooting 8.0 Calibration There really is no need to re -calibrate this instrument. The L TM-Series arrive calibrated to specified measuring ranges at o rder placement. If the need arises and a recal ibration is deemed necessary please f ollow these instructions carefull y. Level simulation will b e r ...
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Emerson 250 - page 32
2. Water damage to the elect ronics module or sensor probe. This is potentially the most severe case the symptoms are unpredictable. If there is any suspici on that the transmitter may have incurred water damag e please contact the factory to make arrang ements to have the unit sent back for factor y inspection. Physical and water damage are not co ...
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Emerson 250 - page 33
Section 9 LTM-350 has HART Protocol 9.0 Hart Protocol: Ge neral Information The LTM-350 is a HART regi stered and certified instrument. The section presents how the HAR T Communication Protocol has been u tilized in the LTM-350. This se ction does not explain what HART Protoc ol is, please visit www.hartcomm2.org to le arn about HART. The following ...
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Emerson 250 - page 34
9.0 Hart Protocol: Menus and Flowchart (continued…) Basic Setup>>>>>>> > Level Setup>>>>>>>>>> > Keypad Rerange>>>>>>>> >>>> > LRV Orientation is: Level Offset URV PV is: (Note 2) Rate of Change Unit LCD Output is: LSL Probe Length USL Level Units Temp ...
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Emerson 250 - page 35
9.0 Hart Protocol: Menus and Flowchart (continued…) HART Information>>>>>> > Manu facturer Model Unique ID Serial Number Date Sales Order Purchase Order Tag Long Tag Message Descriptor Revision #s>>>>>>>>>>>>>> >>> > Universal rev Fld dev rev Final asmbly num Note 1. W hen ...
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