117 • Replacing the H
2
S Scrubber Disk and the Charcoal Filter GX-6000 Operator’s
CAUTION: If you are replacing filters in a probe intended for chlorine
detection, do not install the particle filter.
8 . Carefully screw the top half onto the bottom half disk while keeping the
probe oriented with the probe tip facing up and the sample hose facing
down. The particle filter fits into a recess in the top half of the probe. Be
sure the particle filter is not compressed in any way.
9 . Tighten the halves together very firmly to ensure a seal.
10 . To test the seal, do the following.
a. Install the probe on the GX-6000.
b. Startup the GX-6000.
c. Confirm that a low flow alarm occurs when you cover the end of the
probe tube with your finger.
d. If a low flow alarm does not occur, hand tighten the probe further.
e. If a low flow alarm still does not occur when you cover the probe
tube with your finger, disassemble the probe, inspect the placement of
the hydrophobic filter disk, reassemble the probe, and re-test it.
Replacing the H
2
S Scrubber Disk and
the Charcoal Filter
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.
1 . Verify that the GX-6000 is off.
2 . Use a small Phillips screwdriver to unscrew the four screws holding the
flow chamber to the rest of the GX-6000’s case.
3 . Grasp the sides of the flow chamber and lift it away from the rest of the
case. The screws are captive screws and will not come out of the flow
chamber.
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