WIKA IPT-11 - Manual (Page 39)

8 Maintenance and fault rectification
8 .1 Maintenance, cleaning
When used in the correct way, no special maintenance is required in
normal operation.
In some applications, product buildup on the sensor diaphragm can
influence the measuring result. Depending on the sensor and
application, take precautions to ensure that heavy buildup, and
especially a hardening thereof, is avoided.
If necessary, the transmitter has to be cleaned. In this case, make sure
that the materials are resistant against the cleaning detergents.
8 .2 Remove interferences
The operator of the system is responsible for taken suitable measures
to remove interferences.
A maximum of reliability is ensured. Nevertheless, faults can occur
during operation. These may be caused by the following, e.g.:
l Sensor
l Process
l Power supply
l Signal processing
The first measures to be taken are to check the output signals as well
as to evaluate the error messages via the indicating and adjustment
module. The procedure is described below. Further comprehensive
diagnostics can be carried out on a PC with the software PACTware
and the suitable DTM. In many cases, the causes can be determined
in this way and faults can be rectified.
Connect a handheld multimeter in the suitable measuring range
according to the wiring plan.
? 4 … 20 mA signal not stable
l Level fluctuations
à Set the integration time via the indicating and adjustment
module or PACTware
l no atmospheric pressure compensation
à Check the pressure compensation in the housing and clean
the filter element, if necessary
? 4 … 20 mA signal missing
l Wrong connection to power supply
à Check connection according to chapter "Connection steps"
and if necessary, correct according to chapter "Wiring plan"
Reaction when malfunc-
tions occur
Causes of malfunction
Fault rectification
Checking the 4 … 20 mA
signal
Process pressure transmitter IPT-1* Vers. 3.0 - metalic sensor • 4 … 20 mA/HART 39
8 Maintenance and fault rectification
31543
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EN
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