OPERATION OF IAQRAE
2-11
2.6 Alarm Signals
The built-in microprocessor continually updates and monitors
gas concentrations. It also compares the readings with
programmed low and high instantaneous gas concentration
alarm limit settings. When the concentration exceeds any of the
preset limits, the buzzer and red LED will immediately warn the
user of the alarm condition. Additionally, the IAQRAE will alarm
if one of the following conditions occur:
•
Battery voltage falls below a pre-set voltage level (6.6V)
•
Failure of UV lamp (in PID sensor)
•
Pump
stalls
•
Datalog memory is full.
When the low battery alarm occurs, there will be approximately
20-30 minutes of operating time remaining before the monitor
automatically turns off as the battery voltage falls below 6.4 V.
Alarm Signal Disabled
It is extremely important to note that the alarm signals are
disabled during the following conditions:
•
PC Communication standby mode
•
Calibration
mode.
During these levels of operation, real time monitoring gas
concentration stops. Gas concentrations, including peak and
minimum values will not be calculated.
Latching Alarm Signal
The default alarm signal is the auto reset mode. However, it is
possible to setup the IAQRAE in latching mode so that when
an alarm condition occurs, the alarm signals remain on even
after the alarm condition is no longer present. The user may
change the alarm mode from a PC or while the IAQRAE
monitor is in Advanced User level (See Section 4.5.3 Change
Alarm Mode)
