OPERATION
2 - 12
2.5 Alarm
Signals
At the end of each measurement period, the gas concentration is
compared with the programmed alarm limits (two gas
concentration alarm limit settings: Low & High). A separate
set of limits can be programmed for each tube. If the
concentration exceeds either of the preset limits, the loud buzzer
and red flashing LED are activated immediately to warn user of
the alarm condition.
In addition, the UltraRAE will alarm if one of the following
conditions occurs: battery voltage falls below a pre-set voltage
level (4.4 V), failure of UV lamp, pump stall, or when the
datalog memory is full. When the low battery alarm occurs,
there will be approximately 20-30 minutes of operating time
remaining. When the battery voltage falls below 4.2 V, the
monitor will be turned off automatically.
Figure 2-6 Alarm Signals
10.2 ppm
