
49391
Revision 3
39
Gasurveyor 700
USER MANUAL
5.7.3 Over-range Alarm
In the event of the flammable gas sensor being exposed to a high concentration of flammable gas,
the instrument has an over-range alarm.
• In Confined Space Monitor (CSM) mode if the LEL sensor is exposed to gas above 100%
LEL, EEE will alternate with the HIHI alarm flag (as shown in
Figure 52: Over-range in CSM
).
Figure 52: Over-range in CSM
• In Gas Leak Indoor, Gas Leak Outdoor and Search modes if the PPM sensor is exposed to
a gas reading above 10,000 ppm and no autoranging for the flammable range is enabled,
EEEE flag will appear as shown in
Figure 53: Over-range in GLO
.
Figure 53: Over-range in GLO
5.7.4 Zero Fault
If the monitor is switched on in gas and unable to zero all sensors correctly:
• A flashing ‘Zero’ alarm flag alternates on the display with the gas range.
• The audible alarm sounds, and the red 360
°
LED bar flashes.
Figure 54: Zero Fault
Return the monitor to fresh air and then press
Zero
button. If the fault persists, return the monitor for
service.
Note: If a Zero Fault exists, the monitor can still be used to detect and alarm on all the
other ranges fitted