CHAPTER
10
ALARM SIGNALS
During each measurement period, the gas concentration is compared with the programmed
alarm limits (gas concentration alarm limit settings). If the concentration exceeds any of the
preset limits, the loud buzzer and red flashing LED are activated immediately to warn you of the
alarm condition. In addition, the instrument alarms if one of the following conditions occurs:
battery voltage falls below a preset voltage level, failure of the UV lamp, pump stall, or when the
datalog memory is full.
Alarm signal summary
Message Condition Alarm Signal
HIGH Gas exceeds “High Alarm” limit 3 beeps/flashes per second*
OVR Gas exceeds measurement range 3 beeps/flashes per second*
MAX Gas exceeds electronics’ maximum range 3 beeps/flashes per second*
LOW Gas exceeds “Low Alarm” limit 2 beeps/flashes per second*
TWA Gas exceeds “TWA” limit 1 Beep/flash per second*
STEL Gas exceeds “STEL” limit 1 Beep/flash per second*
Pump icon
flashes
Pump failure 3 beeps/flashes per second
Lamp PID lamp failure 3 beeps/flashes per second plus “Lamp” message
on display
Battery icon
flashes
Low battery 1 flash, 1 beep per minute plus battery icon flashes
on display
CAL Calibration failed, or needs calibration 1 beep/flash per second
NEG Gas reading measures less than number stored in
calibration
1 beep/flash per second
* MiniRAE 3000+, ppbRAE 3000+, and UltraRAE 3000+: Hygiene mode only. In Search mode,
the number of beeps per second (1 to 7) depends upon the concentration of the sampled gas.
Faster rates indicate higher concentrations.
Handheld PID Monitors 49 User Manual
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