3-7
ALARMS
3.4 FAULT ALARMS
Refer to “Table 2.1 PS500 Alarms” on page 2-15, to identify
the audible / visual indication for the following faults.
3.4.1 Low Battery
The “LOW BATTERY” message is displayed,
intermittently on the screen, when the instrument’s battery
has approximately 30 minutes operating time remaining. The
audible alarm sounds every two seconds and the Red LED’s
ash. Recharge or replace batteries as applicable.
The “BAT FAULT” message shows constantly when
approximately three minutes operating time remains. The
audible alarm sounds continuously and the Red LED’s
illuminate constantly. After three minutes the instrument
switches off.
3.4.2 Zero Fault
Note: For instruments with a CO2 sensor tted, refer to
section 3.4.3 for details.
A “ZERO FAULT” message and a ashing spanner symbol
appears after warm-up if the instrument has been unable to
zero all sensors correctly, as shown in Fig. 3-5.
The audible alarm sounds every two seconds and the Red
LED’s ash.
It is recommended that the instrument is returned to a gas free
area. Switch the instrument off and then switch on again. If the
fault persists, return the instrument for service.
However, the instrument can still be used to detect and alarm
on the other sensors tted.
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