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Revision 10
GT SERIES
1 INSTRUMENT, 7 APPLICATIONS
5.5.3 Sensor Fault (After Warm-up)
There are two types of sensor faults:
1. 'ZERO FAULT' and a spanner (wrench) symbol alternating with a zero reading, as illustrated in
.
• Apply relevant test gas for two minutes and then remove it.
• Allow the display to return to zero.
• Switch monitor OFF and ON again.
Figure 50: Zero Fault
• If the fault persists, return the monitor for service.
2. 'ZERO FAULT' and a spanner (wrench) symbol, alternating with a gas reading, as illustrated in
.
• Leave monitor ON for 30 to 60 minutes.
• Switch it OFF and ON.
• If the fault persists, return the monitor for service.
5.5.4 Sample / Flow Fault
If a sample fault occurs, 'FLOW FAULT' alternates with the mode name, as shown in
.
• Pump switches off (except Confined Space mode)
• Pump symbol disappears
• Fault LED tuns ON.
Figure 51: Flow Fault (CSM)
Check sample line, filter or probe for blockage. Clear blockage then restart the pump by pressing
the FLOW ACK button.