36 Dräger PEX 1000
Troubleshooting
6 Troubleshooting
Should it not be possible to eliminate the occurring malfunctions by employing the remedial
measures described, or should other faults occur: Let trained service personnel check and, if
necessary, repair the PEX 1000.
Fault Cause Remedy
Display off Cable faulty Check cable to controller unit.
PEX 1000 cannot be calibrated Sensor faulty or poisoned Replace sensor.
Measuring current is 1 mA,
display shows E0, E1, …., or E8
PEX 1000 indicates fault See following table.
Failure code Cause Remedy
E0 Supply voltage is below 12 V DC or
above 30 V DC.
Connect to correct supply voltage.
E1 Hardware error Replace 4 to 20 mA converter
module.
E2 Storage failure, failure while reading
the calibration information
Repeat calibration procedure. If
failure repeatedly occurs: Hardware
failure. Replace converter module.
E3 Sensor not connected or defective Check sensor connection and if
needed replace sensor.
E4 Sensor signal lower than –5 % LEL or
lower than –0.9 % LEL
Adjust zero point and calibrate
sensitivity.
E5 Failure during zero point calibration
(e.g. if the offset is too high)
Check zero gas or sensor and replace
sensor, if necessary.
E6 Failure during sensitivity calibration
(e.g. if the sensor sensitivity
<0.08 mV/%LEL)
Repeat procedure, check test gas or
sensor and replace sensor, if
necessary.
E7 Failure while calibrating the 4 to
20 mA output signal
Repeat procedure, check electrical
installation.
E8 System error Replace 4 to 20 mA converter
module.
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