V!SA - USER HANDBOOK
3.4.4 Sensor Fault
There are three types of sensor fault as illustrated in the
following displays:
1) If a "ZERO FAULT" flag and a spanner symbol appears
above gas type, as shown in Fig. 3.8, then the sensor
requires replacement or an electrical fault exists. Return
instrument to an approved Service / Repair facility.
Fig. 3.8 Sensor Fault
2) If a "ZERO FAULT" flag and a flashing spanner symbol
appear, alternating with a zero LEL reading as shown in
Fig. 3.9, apply test gas for two minutes to allow the display
to return to zero then switch instrument Off and On again.
If fault remains, return instrument to an approved Service
/ Repair facility.
alternating with
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