GMI PS500 Manual Del Usuario página 42

2. If a "ZERO FAULT" message and a flashing spanner
symbol appear, alternating with a zero LEL reading as
shown in Fig. 3.9, apply test gas to allow the display to
show a reading, then switch instrument Off and On again.
Fig. 3.8 Check Fault
Alternating with
Fig. 3.9 Check Fault
ALARMS
3-11