Heath Consultants Personal Surveyor (PS200 Series) - Manual (Page 60)

4-10
USER HANDBOOK
4.5.3 Sensor Fault
Note: The PS200 instrument features continual toxic
sensor integrity detection. This may generate a
sensor fault indicated by a red illuminated backlight,
audible beeping and flashing red LED’s. Unlike zero
fault, it would only occur immediately after switch-on
and occasionally during operation. If this fault
occurs, allow instrument to run in fresh air for up to
20 minutes. If fault does not clear, return instrument
to an approved Service / Repair facility.
There are three types of sensor fault as illustrated in the
following displays:
1) If a “SENSOR FAULT” warning and a spanner symbol
appears adjacent to a gas type, as illustrated in Fig. 4-8, then
the sensor requires replacement or an electrical fault exists.
Return instrument to an approved Service / Repair facility.
Fig. 4-8 Sensor Fault
2) If a “ZERO FAULT” warning and a flashing spanner
symbol appear, alternating with a zero LEL reading as
illustrated in Fig. 4-9, 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 a GMI
approved Service / Repair facility.