GX-3R Pro Operator’s Manual Chapter 6: Maintenance • 128
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.
8. If your instrument has a factory-installed dummy sensor, ensure that it is still installed
correctly. Make sure that the flat side is facing up, away from the GX-3R Pro.
Figure 18: Replacing a Sensor
Black
Filter
Material
Black
Filter
Material
White
Filter
Material
Sensor
Retainer
"H2S/PH3" or "NH3"
printed on side
Tan
Filter
Material
Dark Gray
Filter
Material
Toxic Sensor
GX-3R Pro
POWER
MOD E
NOTE: All filtersinstalledblack-side-up.
Toxic Sensor Filter, SeeTable
LEL Sensor Filter
Bottom Cover
Filter Gasket/Hydrophobic Dust
Filter Assembly,
gasket tabs on opposite side of this view
For HCNsensor
For H2S-only,
NH3, and PH3
sensors
Toxic Sensor Filters
For CO-only
sensor
For dual
CO/H2S sensor
Toxic Sensor
CO/H
2
S LE L O
2
TOXIC
AIR
For NO2 and
SO2 sensors
White
Filter
Material
Side View
Toxic Sensor
Filter, See
Table
O
2
Oxygen Sensor Combustible GasSensor
Top View
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