GX-3R Operator’s Manual Chapter 6: Maintenance • 85
Replacing a Sensor
CAUTION: The CO and H
2
S sensors contain an electrolyte solution. If contact with the
electrolyte occurs, wash the area immediately.
CAUTION: The buzzer cover, sensors, and filters are the only user-serviceable parts in the
GX-3R. Do not replace or modify any other part.
1 . Verify that the GX-3R is off.
2 . Turn the GX-3R upside down.
3 . Use a small Phillips screwdriver to unscrew the two screws holding the bottom cover to
the rest of the GX-3R’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’s case.
5 . Remove the filter gasket/sensor retainer assembly from the GX-3R. The sensors will be
exposed.
6 . Locate the sensor you want to replace and remove it from its socket.
7 . Carefully insert the replacement sensor in the correct socket. Be sure that the new sensor
is installed in the same position as the old sensor and that it is aligned correctly. The
toxic and oxygen sensors have slots to orient the sensor. The combustible gas sensor has
tabs to orient the sensor. Do not force a sensor into its slot.
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