62
8
Correcting Faults
8.1.1
Faults
Deactivation during maintenance: Safety transfer O
2
, limit values, fault 001, 002, 004,
005, 007, 008.
Fault no.
Fault text
001 (HP)
101 (ÜP)
Probe/probe voltage fault
/1
Voltage range of O
2
electrode outside of the permissible range.
U-O
2
must always lie within a range of -25 mV ... +300
mV during meas-
urement operation; tolerance time of 30 seconds.
Help:
- The cold start might have been interrupted therefore the probe is not yet
ready for operation.
- Remove the probe and check with ambient air and test gas.
Compare the values with the test report. Exchange the probe if required.
- If the O
2
electrode reacts to CO, the sensor is defective; exchange the
probe.
/2
Voltage range of CO electrode outside of the permissible range.
U-CO must always lie within a range of -25 mV ... +800 mV during meas-
urement operation; tolerance time of 30 seconds.
Help:
- The cold start might have been interrupted therefore the probe is not yet
ready for operation.
- Remove the probe and check with ambient air and test gas.
Compare the values with the test report. Exchange the probe as required.
/3
O
2
offset voltage outside of the permissible range during pre-purge
The offset voltage of the O
2
electrode must always lie within a range of
-25 mV ... +5 mV during pre-purge.
Help:
- The cold start might have been interrupted therefore the probe is not yet
ready for operation.
- Remove the probe and check with ambient air and test gas.
Compare the values with the test report. Exchange the probe if required.
- The probe is blown "cold": unfavourable installation site.
/4
CO offset voltage outside of the permissible range during pre-purge. The
offset voltage of the CO electrode must always lie within a range of
-25 mV ... +10 mV during pre-purge.
Help:
- The cold start might have been interrupted therefore the probe is not yet
ready for operation.
- Remove the probe and check with ambient air and test gas.
Compare the values with the test report. Exchange the probe if required.
- The probe is blown "cold": unfavourable installation site.
/5
Both offset voltages outside of the permissible range during pre-purge; see
triggers /3 and /4.