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8.
ROUTINE MAINTENANCE
Dust and Water-block Filter
A filter, housed in a knurled nut, removes particles of dust and dirt and blocks water. The
white disk in the filter should be inspected periodically for accumulated dirt which may slow air
sampling. A filter can be cleaned by removing the probe and tapping the filter cartridge on a
hard surface to remove dry dust and dirt. Do not insert objects into the water block filter while
attempting to clean it as they may puncture the filter. Typically, the filter needs to be replaced
twice a year. Replacement water-block filters are available as Part No. WF-305 (package of 5
filters).
Figure 1. Dust and water-block filter.
CAUTION:
Do not use a Gas-Ranger without a dust and water-block filter. Do not use a
dust and water-block filter with a puncture.
Inlet Dust Filter
Removal of the intake connector (used to attach the sampling hose) of the detector
exposes a metal filter pressfit onto the intake. These filters are not a substitute for dust and
water-block filters as they will not block water or remove very fine dust and dirt. If this filter
gets blocked, it may be cleaned with compressed air or replaced.
Water-stopper
The water-stopper (Figure 2) provides a quick way to
continue bar holing if water is encountered in a bar-hole. The water-
stopper is inserted between the dust and water-block filter and the bar
hole probe. A float inside the water-stopper is connected to a plunger
which blocks flow whenever the float is lifted by water. Water is
released and the plunger returned to its normal position by depressing
a release push-button.
Figure 2. Water-stopper
