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Operating
Instructions
PHT
40
© SICK AG • Germany • All rights reserved
8013362/1DQY/2021/10/12
Failure
Possible cause
Procedure
No output signal
Cable break
Check connections and cable
No/incorrect voltage supply or current
spike
Adjust the voltage supply to correspond
with the Operating Instructions *)
No/False output signal
Incorrectly wired (e.g. Connected as 2-wire
instead of 3-wire system)
Follow pin assignment (see Instrument
Label / Operating Instructions)
Output signal unchanged after change in
pressure
Mechanical overload through overpres-
sure
Replace instrument; if failure reoccurs,
consult the manufacturer *)
Signal span dropping off/too small
Mechanical overload through overpres-
sure
Replace instrument; if failure reoccurs,
consult the manufacturer *)
Diaphragm is damaged, e.g. through
impact, abrasive/agressive media; corro-
sion of diaphragm/pressure connector;
transmission fluid missing.
Contact the manufacturer and replace the
instrument
Seal/Sealing face damaged/contami-
nated, seal mounted incorrectly, threads
crossed
Clean the seal/sealing face, possibly
replace the seal.
Signal span erratic / incorrect
Electromagnetic interference source in
the vicinity, e.g. inverter drive
Shield the device; shield the cables;
remove the interference source
Working temperature too high/too low
Ensure permissible temperatures as per
the Operating Instructions
Instrument not grounded
Ground instrument
Violent fluctuations in the process media
pressure
Damping; consult with manufacturer
Abnormal zero point signal
Working temperature too high/too low
Ensure permissible temperatures as per
the Operating Instructions
Abnormal mounting position
Correct the zero point through the potenti-
ometer, control panel or software
Overload limits exceeded
Ensure permissible overload limits are
observed (see Operating Instructions) *)
*) Make sure that after the setting the unit is working properly. In case the error continues to exist send in the instrument for repair (or
replace the unit).
10. Trouble shooting
If the problem persists, contact our sales department.