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Flow system – RKI Instruments 35-3010RKA-06 User Manual

Page 7

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35-3010RKA-06 Sample-Draw Detector • 3

An aluminum subpanel is mounted to the interior of the housing. The sample-draw
detector’s internal components are mounted to the subpanel.

Flow System

The sample-draw detector’s flow system consists of the INLET fitting, hydrophobic filter,
charcoal filter, pump, flowmeter, bypass valve, status lights, pressure switch, flow block,
and EXHAUST fitting (see Figure 1). Figure 2 illustrates how the gas sample moves
through the flow system.

Figure 2: Sample-Draw Detector Flow Diagram

INLET Fitting

The INLET fitting on the bottom of the housing allows the gas sample to enter the sample-
draw detector. The INLET fitting accepts 1/4 in. rigid tubing. See “Installation” on page 9
for instructions to connect tubing to the INLET fitting.

Hydrophobic Filter

The hydrophobic filter is to the left of the main circuit board. It is held in place by a metal
clip. It prevents water and other liquids from contaminating the flow system. Replace the
filter when it appears dirty, discolored, or clogged. If a liquid other than water is drawn
into the filter, replace the filter as soon as possible.

Oxygen
Dummy

Plug

Hydrophobic

Filter

Inlet

Exhaust

Pump

CO

Dummy

Plug

Flow meter

Flow Block

Bypass

Valve

H2S

Pressure Switch

Charcoal

Filter

LEL