Emerson Transmitter 350 Mode D’Emploi

If the need arises and a recalibration is deemed 

necessary please follow these instructions carefully.

Level simulation will be required at 0% and 

100% positions.

1. Verify the “probe length” is not the same as 

the” measuring range” desired.  If so please 

change accordingly.

See Sections 2.1 and 7.1.

2. Go to the “Change Range” menu and set 

the desired URV (measuring range).

3. Go to the “Trim Sensor” menu and enter.

4. At the “Trim Zero” screen place the level (or 

magnet/float) at 0% (4mA point) and then 

press enter.

5. At the “Trim Span” screen place the level 

(or magnet/float) at 100% (20mA point) and 

then press enter.

6. “Exit” the configuration menus and the 

instrument should be calibrated.  If not 

begin to troubleshoot or consult factory for 

assistance.

Error Preventative Calibration: The LTM-250/350 

transmitters are protected from incorrect 

calibration so if something is done incorrectly it will 

display “Span Error” on the LCD for 5 seconds and 

then return to the beginning of the “Trim Sensor” 

menu.

Recommendation:  Again there is no need to 

Magtech manufactures custom built products so 

each transmitter has been specifically designed to 

fit on a magnetic level gage or be inserted into a 

tank/vessel and has been approved by the end user 

at some point during the ordering/purchasing 

process.  Each transmitter has been factory 

calibrated to meet end user requirements so there 

is no need to recalibrate these transmitters unless 

the requirements have changed from the time of 

purchase/delivery to installation.  If the need arises 

to calibrate these units to a new range please 

carefully read and follow the calibration procedure 

in the instruction and operation (I/O manual) or 

consult the factory.  Always feel free to contact the 

factory if any questions or uncertainties arise.  The 

following guide has been established to guide the 

end user through some troubleshooting procedures 

if the need arises.

There are 3 basic scenarios that can potentially 

cause issues.  They are:

1. Physical damage to the sensor probe.  

Accidents can happen during the installation 

process and if the sensor is permanently bent, 

bowed, or kinked it will no longer work 

properly.  Some symptoms of damage to the 

sensor probe are:

a. Erratic output, unit jumping to full scale 

(alarm mode) randomly, usually around 

the damage point.

b. Unit in constant alarm condition

c. Unit going into alarm condition after a 

certain point.

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