RKI Instruments GX-2003 Operator's Manual download pdf (Page 18)

11 • Instrument Description GX-2003 Operator’s Manual

CO Filter

The CO filter is located in the flow chamber directly over the CO

sensor. It is a red and black plastic ring which contains two charcoal

filter disks, two H

S removal filter disks, and a thin white plastic sheet

with a hole in the middle on each side to support the filter disks. The

charcoal filter disks are black, have a woven texture, and are

impregnated with an H

S absorbing material. The red side of the CO

filter snaps into a threaded plastic filter retainer which screws into the

flow chamber over the CO sensor.

The CO sensor will respond if exposed to H

S and certain

hydrocarbon gases. The charcoal filter disks scrub these gases out of

the sample to avoid false CO readings. The H

S filter disks are used to

extend the H

S absorbing life of the charcoal disks. If false or elevated

CO readings are noticed, especially in the presence of H

S, change the

CO filter.

Inlet Filter Holder

The filter holder is a clear plastic dome shaped piece on the top of the

case. A male quick connect fitting is located on the inlet filter holder.

This is the GX-2003’s inlet fitting. A cotton dust filter is inside the filter

holder. The filter holder may be removed by turning it

counterclockwise and pulling it away from the case. Two flat

membrane disk hydrophobic filters, a wire mesh disk, and a rubber

filter retaining gasket are held in place by the filter holder and are

located in the bottom of the case chamber where the filter holder is

installed.

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RKI Instruments GX-2003 Operator's Manual Page 18