Dräger PEX 3000

Troubleshooting_ HQ
_ Dräger PEX 3000 
4.5.1 Operational interruptions
In the event of operational interruptions, e.g. when performing maintenance and
inspection work, the transmitter is ready for use again approx. 10 minutes
(sensor warm-up time) after turning on the system once again.
– The transmitter must be re-calibrated, if necessary.
4.5.2 Using the dust filter
Type XTR 0000: a dust filter can be used for the DrägerSensor PR M DQ (see
order list, part number 68 10 537). This is simply pressed into the opening
before the sensor’s wire mesh disc and is latching. This dust filter will effectively
have no impact on the sensor’s response time and the influence on the sensor’s
sensitivity is also minimal. If a dust filter is used, it must also to be used during
the calibration procedure. The dust filter should be replaced before calibration.
5 Troubleshooting
If it is not possible to eliminate the faults by employing the remedial measures
described, or if other faults occur, the transmitter must be checked by
specialists and repaired, if necessary.
Fault Cause Remedy
Display off Cable faulty Check cable to the con-
troller.
Transmitter cannot be
calibrated
Sensor faulty or poi-
soned
Replace sensor (see
"Replacing the sensor",
page 42).
Measuring current is
1 mA, display shows E0,
E1, …. or E8
Transmitter signals a
fault
See following table.
Error code Cause Remedy
E0 Supply voltage is below
12 V or above 30 V.
Correction of the supply
voltage.
E1 Hardware error Replace 4 to 20 mA con-
verter module.
E2 Memory error, error
when exporting calibra-
tion information
Repeat calibration pro-
cedure. If calibration
fails again: Hardware
error. Replace converter
module.
E3 Sensor not connected or
defective
Check sensor connec-
tion and replace sensor,
if necessary.
E4 Sensor signal below –
5 %LEL or lower than –
0.9 %LEL
Calibrate the zero-point
and span.
E5 Error during zero cali-
bration (e.g. offset too
high)
Check zero gas and
sensor and replace sen-
sor, if necessary.
E6 Error during span cali-
bration (e.g. sensor sig-
nal <0.08 mV/%LEL)
Repeat the procedure,
check the test gas and
sensor and replace sen-
sor, if necessary.
E7 Error while calibrating
the 4 to 20 mA output
signal
Repeat calibration,
check the measurement
setup for errors.
E8 System error Replace 4 to 20 mA con-
verter module.
Error code Cause Remedy