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6. Maintenance and Troubleshooting
Although transmitters LD series do not require a maintenance on periodical basis, it is good practice
to regularly check the general transmitter status, the possible presence of rust or damage on the
case or on the measuring diaphragm and the presence of clogging in the process connection.
Prohibition!
Repair, maintenance and/or overhaul of the equipment shall only be conducted by
the manufacturer himself, or by a repairer he has qualified or authorized.
Is forbidden during the maintenance operation to use the tool as a handle
or step.
Please refer to the following pages scheme for troubleshooting.
In any case contact our technical department Spirax Sarco for help.
Condition
Potential source
Solution
The transmitter
doesn’t turn on
Supply
Check the supply voltage to be 12.5Vdc<Vsupply<30Vdc.
Polarity
Check the transmitter connection polarity.
Electrical load
Check that the load is less than the maximum allowed.
Measure is
incorrect
Process
Accurately verify the compatibility between the process
and the connection type.
Sensor drift
Apply zero input conditions to the transmitter and use the
OFFSET command.
EMC interference
Accurately verify the possible presence of electromagnetic
interference on the supply line. Check the PE connection.
Erratic analog
output
Wrong span limits Use the LRV and URV commando (or SET LRV and SET
URV) to correct the output.
Uncalibrated
analog output
Use the LOOP TEST command to verify the analog output
calibration. If it is not correct, use the CAL4-20mA command
to calibrate the output.
Incorrect
HART
®
settings
Use the ADDRESS command to verify that the polling
address is set to 0.
Analog output
<4mA or >20mA
Transmitter in
fault mode
Check if the output isn’t out of the allowed span or check
the presence of a failure (e1, e2, … on display).
Wrong fault
settings
Check the settings using the ALARM TYPE command.
Unstable
measure
Measuring
disturbs
Set an input average using the DAMP VALUE command
(i.e. 10 seconds).
Impossible to
access the menu
Wrong / forgotten
password
Contact Spirax Sarco for help
