41 • Chapter 3: Operation GX-3R Pro Operator’s Manual
Responding to Battery Alarms
WARNING: The GX-3R Pro is not operational as a gas monitoring device during a dead
battery alarm. Take the Model GX-3R Pro to a non-hazardous area and replace
or recharge the batteries as described on page 120 and page 121.
The GX-3R Pro is fully functional during a low battery warning. Proper instrument operation is
only guaranteed for 10 minutes but the instrument will operate for 1-2 hours after the start of the
alarm.However, only 1-2 hours of operating time remains. The amount of operating time left
depends on LCD backlight use and the alarm frequency. Recharge the Li-ion battery pack (page
121) or replace the alkaline batteries (page 120) as soon as possible.
NOTE: Alarms and the LCD backlight consume battery power and reduce the amount of
operating time remaining.
Responding to Sensor Failure Alarms
1. Determine which sensor triggered the sensor failure alarm.
2. Calibrate the failed sensor, as described on page 75.
3. If the sensor failure continues or if the sensor could not be calibrated, replace the sensor as
described on page 128
4. If the sensor failure condition continues, contact RKI Instruments, Inc. for further
instructions.
Responding to a LIMITED HC GAS LIST Alarm
An HC GAS LIST LIMITED alarm can occur at startup or after a calibration.
1. Press and release POWER MODE to acknowledge the alarm.
The combustible gas sensor actually contains 2 separate sensors: a standard catalytic sensor and a
backup, poison-resistant sensor that is resistant to sensor poisons like silicone. A LIMITED HC
GAS LIST alarm indicates that the standard sensor has a reduced output, possibly due to one or
more sensor poisons in the environment, and that the poison-resistant sensor is being used to
provide gas readings. The poison-resistant sensor has a limited list of detectable gases. The table
shown on page 48 shows which gases can and cannot be detected after receiving a LIMITED HC
GAS LIST alarm.
If your application requires detection of a gas still detectable after a LIMITED HC GAS LIST
alarm (like methane or isobutane), there is no need to replace the combustible gas sensor
.
However, if your application requires detection of a gas not detectable after a LIMITED HC GAS
LIST alarm (like methanol or ethanol), you must replace the combustible gas sensor as soon as
possible.
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