GX-6000 Operator’s Manual
Chapter 6: Maintenance • 111
5 . Remove the white hydrophobic filter disk from the top of the bottom half. The disk
sits in a black gasket.
6 . Place the new filter disk flat on top of the gasket. Make sure that it sits in the gasket
and does not extend over the gasket’s edge.
7 . Set the new particle filter on top of the filter disk. The bigger end should be facing
down.
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.
4 . To replace the H
2
S scrubber disk, remove the old one from its recess in the sensor
gasket and replace it with the new one making sure that it is properly seated. You do
not have to remove the sensor gasket to replace the H
2
S scrubber disk. It sits in a
recess on top of it.
