GX-3R Operator’s Manual Chapter 6: Maintenance • 83
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 bottom cover from the rest of the GX-3R’s case.
6 . Remove the filter gasket/sensor retainer assembly.
7 . Remove the filter gasket/ hydrophobic dust filter assembly.
8 . Gently pry out the filter you want to replace.
9 . Install the new filters.
a. Dark red H
2
S scrubber disk for combustible gas sensor: The brown side of the filter
case should face toward the GX-3R.
b. Black and white combo filter for CO/H
2
S dual sensor: The red side of the filter case
should face toward the GX-3R. The black filter material should face the edge of the
GX-3R while the white filter material should face the H
2
S scrubber disk.
c. Black filter for CO-only sensor: The red side of the filter case should face toward the
GX-3R.
d. White filter for H
2
S-only sensor: The white side of the filter case should face toward
the GX-3R.
10 . Reinstall the filter gasket/hydrophobic dust filter assembly onto the sensor retainer. The
gasket tabs face down.
11 . Reattach the bottom cover to the GX-3R. Push it onto the GX-3R until it snaps into
place.
12 . Reinstall the two screws that were loosened in Step 3.
13 . Perform a bump test as described on pg.46 to confirm good operation.
Figure 12: Replacing the Sensor Filters
Toxic Sensor Filter, See Table
Bottom Cover
Filter Gasket/Hydrophobic Dust
Filter Assembly,
gasket tabs on opposite side of thisview
Black
Filter
Material
NOTE: All filtersinstalled black-side-up.
Toxic Sensor Filters
White
Filter
Material
Black
Filter
Material
For H2S-only
sensor
For dual
CO/H2S sensor
For CO-only
sensor
White
Filter
Material
GX-3R
CO/H
2
S LEL O
2
POWER
MODE
AIR
Top View
LEL
Sensor
Filter
Side View
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