OPERATION
2-4
2.3. Alarm
Signals
The Q-RAE Plus will alarm under conditions summarized in
Table 4.
Table 4. Alarm Signals and Reset
Condition
Alarm Signal
Message
Alarm Reset by
Gas exceeds
“High Alarm” limit
3 beeps/flashes
per sec/ Vibration
Sensor name
and “High”
Move away from gas.
Gas exceeds “Low
Alarm” limit
2 beeps/flashes
per sec/ Vibration
Sensor name
and “Low”
Move away from gas.
Gas exceeds
STEL
1 beep/flash per
sec / Vibration
Sensor name
and “STEL”
Move away from gas
and wait 15 minutes.
Gas exceeds TWA
1 beep/flash per
sec / Vibration
Sensor name
and “TWA”
Move away from gas,
turn unit OFF and ON
Gas exceeds the
sensor range
3 beeps/flashes
per sec/ Vibration
Sensor name
and “OVR”
Move away from gas.
Unit short circuit
or reading over
maximum range
3 beeps/flashes
per sec/ Vibration
Sensor name
and “MAX”
Move away from gas.
Excessive sensor
negative drifting
1 beep/flash per
sec / Vibration
Sensor name
and “NEG”
Perform a fresh-air
zero calibration.
Blocked inlet or
pump failure
3 beeps/flashes
per sec
“Pump”
Unblock the inlet and
press
[Y/+]
; adjust
pump threshold.
Excessive LEL
gas or LEL sensor
OFF
3 beeps/flashes
per sec/ Vibration
LEL sensor
name and “Off”
Move away from gas
and turn the LEL
sensor back ON.
Low battery
(<3.3V)
1 flash per sec
1 beep per min
“Bat”
Charge the battery.
Memory full
1 flash per sec
“Mem”
Clear the datalog.
Datalog memory
write error
1 flash per sec
“Emm”
Turn the unit OFF and
then back ON.
Alarm Signal Testing:
Under normal non-alarm conditions, the
buzzer, vibration alarm, LED, and backlight can be tested by
pressing [Y/+] momentarily.
WARNING!
The alarm signals are disabled during PC communication,
calibration, and datalog review or when printing to a serial printer.
To reduce the risk of exposure to hazardous atmospheres,
perform these operations only in areas known to be safe. During
these operations, real time monitoring of the gas stops.
