125 • Chapter 6: Maintenance GX-3R Pro Operator’s Manual
10. Reinstall the filter gasket/hydrophobic dust filter assembly onto the sensor retainer. The
gasket tabs face down.
11. Reinstall the sensor retainer over the sensors.
12. Reattach the bottom cover to the GX-3R Pro. Push it onto the GX-3R Pro until it snaps into
place.
13. Reinstall the two screws that were loosened in Step 3.
14. Bump test the GX-3R Pro as described on page 68 to confirm good operation.
Black
Filter
Material
"H2S/PH3" or"NH3"
printed on side
Tan
Filter
Material
Dark Gray
Filter
Material
White
Filter
Material
White
Filter
Material
Black
Filter
Material
Sensor
Retainer
GX-3R Pro
POWER
MODE
For HCN sensor
For CO-only
sensor
For dual
CO/H2S sensor
NOTE: Allfiltersinstalled black-side-up.
Bottom Cover
Filter Gasket/Hydrophobic Dust
Filter Assembly,
gasket tabs onopposite sideof this view
LEL Sensor Filter
Toxic Sensor Filter, See Table
CO/H
2
S LEL O
2
TOXIC
For NO2 and
SO2 sensors
For H2S-only,
NH3, and PH3
sensors
Side View
AIR
Toxic Sensor Filters
Top View
Toxic Sensor
Filter, See
Table
Figure 16: Replacing the Sensor Filters
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