Section 6: Transmitter Calibration And Troubleshooting Page; Calibration; General Troubleshooting - Emerson Magtech LTM−350 Series Instruction And Operation Manual

August 2020
4mA Saturation (4mA Sat):
When turned on this feature is designed to cause the
transmitter output to go to 3.80mA saturation if the level
drops below the calibrated 4.00mA point. By default this
feature is turned off so the transmitter output will hold
4.00mA if the level were to slightly fall below the calibrated
4.00mA point. This is due to the design of the transmitter as
it pertains to the MLI and in direct insertion applications.
This option/feature only appears in software revisions
1.02.00 or higher.
Section 6: Transmitter Calibration and Troubleshooting

6.0 Calibration

There really is no need to re-calibrate this instrument.
The LTM-Series arrive calibrated to specified measuring
ranges at order placement.
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.
accordingly. See Section 5.1.
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 move the level (or
magnet/float) to 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:
If so please change
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Reference Manual
L231040 Rev AD
The LTM-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 recalibrate the instrument simply
go to the "Change Range" menu and adjust the LRV or URV
as desired.

6.1 General Troubleshooting

Magtech manufactures custom built products so each
transmitter has been specifically designed to fit on a MLI 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:
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.
NEVER bend, bow or cause a kink in the sensor
probe, this will damage the instrument and void the warranty.
Do not attempt to straighten the sensor probe, this will not
help the instrument work.
please file a claim with the shipping company and contact the
factory to arrange for a replacement.
If the shipment arrives damaged