Rae QRAE PLUS PGM-2000, Operation & Maintenance Manual

Page: 26 / 88

OPERATION
2-13
See Table 4 for the summary of the alarm signals. Some of
these error messages will also be discussed in Chapter 7.
When the low battery alarm occurs, there will be approximately
20-30 minutes of operating time remaining. When the battery
voltage falls below 3.1V, the monitor will shut down
automatically.
Alarm Signal Disable Situation: It is extremely important to
note that during the following conditions, the alarm signals are
disabled while:
1) PC communication is in standby mode.
2) In calibration mode.
3) Viewing data during datalog.
4) Printing data to a serial printer.
WARNING!
The alarm signals are disabled during PC communication,
calibration, and datalog review or when printing data to
the serial printer. To reduce the risk of exposure to
hazardous atmospheres, perform PC communication,
calibration, datalog review or data printing only in areas
known to be non-hazardous.
During these modes of operation, real time monitoring of the
gas concentration stops. None of the gas concentrations will be
calculated, including Peak, STEL or TWA.
Alarm Signal Latching