Dräger Polytron Ex, Instructions For Use Manual, Page: 23 / 39

9023744 - 3rd edition - October 2005
Page 23 of 40
Fault – Cause – Remedy
Fault – Cause – Remedy
Should it not be possible to eliminate the malfunctions occurring by employing the remedial measures described, or should
other faults occur:
Transmitter resp. Sensing head SE Ex: check and, if necessary, arrange repair by trained service personnel.
Fault Cause Remedy
No Display Cable faulty Check cable to central controller.
Transmitter resp. sensing head can no
longer be calibrated Ex-sensor faulty or poisoned Replace Ex-sensor, page 22.
Measurement current fluctuates with
approx. 1 Hz between 2.5 mA and 5 mA Sliding switch set to "1" = cal or "2" =
test Set sliding switch to "0" = normal.
Measurement current less than 3.0 mA Sensor connection interrupted or Ex-sen-
sor defective Replace Ex-sensor, page 22.
Measurement signal extremely negative Calibrate transmitter resp. sensing head,
page 15 or page 16.