OPERATION
2-15
2.5 Alarm Signals
During each measurement period, the gas concentration is
compared with the programmed alarm limits (gas
concentration alarm limit settings: Low, High, TWA and
STEL). If the concentration exceeds any of the preset
limits, the loud buzzer and red flashing LED are activated
immediately to warn the user of the alarm condition.
In addition, the MiniRAE 2000 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 turn off
automatically.
Alarm Signal Summary:
Condition Alarm Signal
Gas exceeds “High Alarm”
limit
3 beeps/flashes per second
Gas exceeds “Low Alarm”
limit
2 beeps/flashes per second
Gas exceeds “TWA” limit 1 Beeps/flashes per seconds
Gas exceeds “STEL” limit 1 Beeps/flashes per seconds
Pump failure 3 beeps/flashes per second plus
“Pump” message on LCD
PID lamp failure 3 beeps/flashes per second plus
“Lamp” message on LCD
Low battery 1 flash per second, 1 beep per minute
plus “Bat” message on LCD
Memory full 1 flash per second plus “Mem”
message on LCD
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