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Emerson LTM-300 - page 1
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Emerson LTM-300 - page 2
L TM-300 Magnetostrictive Level T ransmitter Instruction and Maintenance Manual T able of Contents Section 1. T ransmitter Overview Page 1.0 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Level T ransmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
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Emerson LTM-300 - page 3
The L TM-300 is an elec tronic field instrument, suitable for installation i n h a z a r d o u s a n d n o n - h a z a r d o u s i n d u s t r i a l a r e a s . Te s t i n g a n d certification has been obtained from different agencies for installation in specific areas. This instrument is a two wire , loop powered smart transmitter , designed ...
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Emerson LTM-300 - page 4
The L TM -300 is an assembly of two major components: • The S ensor T ube Assembly . This a 5/8” diameter stainless steel probe, sealed on one end, with the magnetostri ctive wavegui de in its center . In addition to the magnetostrictive wa veguide, the tube also houses the optional temperature sensor and the detec tor electronics. The tube is ...
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Emerson LTM-300 - page 5
Level/Interface. A second float ma y be added below the first one, and the second output will be calibrated automa tically. The second time interval is measured in the same manner as the first and added to the first to derive the position of the heavier floa t. The same six inch dead zone applies to the measur ement of the second level althoug ...
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Emerson LTM-300 - page 6
Ambient T emp. Range -20°C ... +40°C (-4°F ... 104°F) Humidity Limits: SAMA PMC 31.1-5.2 Vibration Limits: SA MA PMC 31.1-5.3 RFI Limits: SAMA PMC 31.1-20 t o 1000 MHz up to 30V/m Material: 316ss standard, optional Hastalloy , Monel, Kynar c oated Operating T emperature: -50 to 302°F (-50 t o 150°C ) Maximum Pressur e: 2000 psig @ 300°F Rang ...
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Emerson LTM-300 - page 7
Displays Level Measur ement Display - in inches Level measur ement Display - in centimeters Level Measur ement Display - in millimeters Level Measur ement Display - in feet Level Measur ement Display - in meters Inter face Measurements - same decimal positions as L evel Only if configuration set to L evel+Inter face or All T emperature Measurement ...
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Emerson LTM-300 - page 8
6.4 Star t-Up f or Gage -M ounted L TM T ransmitters If the transmitter does not appear to calibrate properly, or has an erratic output, check the deadband of the sensor tube and ensure that the float is within the active region of the probe. The active region of the sensor tube is t ypically mar ked with 20mA and 4mA stickers when the unit is cal ...
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Emerson LTM-300 - page 9
All MagT ech produc ts are warran ted against defects in materials and workmanship of one year from date of shipment. The level gage chamber and process connections are guaran teed for the life of the tank or vessel to which it is attached . Floats are guarant eed for two years . MagT ech will repair or r eplace at its discretion those products tha ...
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Emerson LTM-300 - page 10
When the HART Communicator is connected to the transmitter and turned on, the first screen that is seen by the user is the root menu screen. If the transmitter is configured as L evel Only or Level plus T emperature, the scr een to the left shows the information displayed to the user . However if the tr ansmitter is configured as L evel plus Int ...
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Emerson LTM-300 - page 11
If the user selects Operation Status from the Diagnostics screen, he is able to view all of the status bits indicating the health of the transmitter operation. If the entry is labeled OFF , that means that the entr y is in normal operating conditions. If the entr y is labeled ON, that means that the transmitter diagnostics has detected an abnormal ...
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Emerson LTM-300 - page 12
The HART Communicator inf orms the user that the maintenance flags have been r eset when the transmitter has replied to the reset command. The user must acknowledge this information by pressing OK to continue . The user is then notified that the loop may now be returned to automatic contr ol. After the user presses OK the HART Communicator r etur ...
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Emerson LTM-300 - page 13
If it is desired to trim the digital level value, he may selec t a single point zero trim or a full level trim that requires the input of both the zer o l e v e l v a l u e a n d s o m e o t h e r l e v e l value preferably near the end of the level measurement tube . If the transmitter is configured with temperature measur ement, he may select a ...
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Emerson LTM-300 - page 14
Starting at the Calibration screen, select the Zero L evel T rim procedure . This procedure trims the Level digital v alue measurement at the position that the user desires to be the zer o refer ence position. If the user selects Zero Level T rim from the Calibration scr een, this screen will appear reminding the user that the loop should be remove ...
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Emerson LTM-300 - page 15
The HART Communicator now requests that the level floa t be set to the desired level upper trim point. The second trim point can be any other level point but it is recommended that this point be as far away fr om the zero point as possible. When the float is at this position, the transmitter will alway s report the digital value entered in the us ...
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Emerson LTM-300 - page 16
The user is then notified that the loop may now be returned to automatic contr ol. After the user presses OK the HART Communicator r eturns to the Calibration screen. The HART Communicator is now at the starting screen for the Zero T emper T rim . F ull T emperature T rim Starting at the Calibration screen, select the F ull Level Trim procedure . ...
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Emerson LTM-300 - page 17
The user is then notified that the loop may now be returned to automatic contr ol. After the user presses OK the HART Communicator r eturns to the Calibration screen. The HART Communicator is now at the starting screen for the F ull T emper T rim. Basic Setup Proc edures If a transmitter has been configured to measure both L evel and Inter face , ...
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Emerson LTM-300 - page 18
The HART Communicator will display this screen r eminding the user that the loop should be removed fr om automatic control before pr oceeding. When this has been done, the user must press OK to continue . The user is then notified that the loop may now be returned to automatic contr ol. After the user presses OK the HART Communicator r eturns to t ...
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Emerson LTM-300 - page 19
The next screen gives the user a choice to set the 4mA or 20mA values or to Exit the procedur e. Here the user will select the 4mA menu position. The HART Communicator r equests the user to set the Lev el (or Inter face) to the position that is to provide the 4mA loop curr ent output. When that has been done, the user must press OK to continue with ...
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Emerson LTM-300 - page 20
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