127
•
Chapter 6: Maintenance
GX-3R Pro Operator’s Manual
Replacing a Sensor
CAUTION:
The CO, H
2
S, and super toxic sensors contain an electrolyte solution. If contact with
the electrolyte occurs, wash the area immediately.
CAUTION:
The buzzer cover, sensors, filters, and alkaline batteries are the only user-
serviceable parts in the GX-3R Pro. Do not replace or modify any other part.
1. Verify that the GX-3R Pro is off.
2. Turn the GX-3R Pro upside down.
3. Use a small Phillips screwdriver to unscrew the two screws holding the bottom cover to the
rest of the GX-3R Pro’s case. Only unscrew them until the heads are flush with the edge of the
bottom cover.
4. Using a small flat blade screwdriver, gently pry each side of the bottom cover away from the
rest of the GX-3R Pro’s case.
5. Remove the filter gasket/sensor retainer assembly from the GX-3R Pro. The sensors will be
exposed.
6. Locate the sensor you want to replace and remove it from its socket.