GX-2009 Operator’s Manual
Maintenance • 63
Replacing the Scrubber Filters
The H
2
S filter disk is dark red in color and although it may darken over time, its color is not
indicative of remaining filter life. The H
2
S filter disk can absorb H
2
S for 33 ppm hours and
should be replaced after that much exposure. With this many ppm hours of absorption, the
H
2
S filter disk should be replaced after 80 minutes of exposure to 25 ppm H
2
S. This equates
to replacing the H
2
S filter disk after 40 2-minute calibrations with a cylinder containing 25
ppm H
2
S. If H
2
S exists in the monitoring environment, the H
2
S filter disk will have to be
replaced more frequently.
WARNING: Replace the scrubber filters in a non-hazardous environment.
1. Verify that the GX-2009 is off.
2. Unscrew the two screws that secure the sensor retainer and sensor cover retainer to the
GX-2009 and remove them.
3. Using a small flat blade screwdriver, gently pry each side of the sensor cover retainer
away from the sensor retainer.
4. Remove the sensor cover and sensor retainer gasket to gain access to the scrubbers.
5. The charcoal filter disk is located in the CO sensor diffusion port. One filter disk is used.
One H
2
S removal filter disk is located in the combustible gas diffusion port.
POWER
MODE
Sensor Cover
Sensor Cover
Retainer
AIR
Sensor Retainer
Gasket
H
2
S
CO
%LEL
O
2
RKI
GX-2009
H2S Removal
Filter Disk
Charcoal
Filter Disk
Figure 23: Removing the Sensor Retainer and Replacing the Scrubber Filters
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