Rki-instruments 35-3000RKA-10 User Manual download pdf (Page 6)

6 • 35-3000RK-10 PPM Hexane Sample Draw Detector

Flow System

The sample draw detector’s flow system consists of the inlet fitting, exhaust fitting, pump,

flowmeter, bypass valve, flow block, status LEDs, and pressure switch (see Figure 1).

Figure 2 below illustrates how the gas sample moves through the flow system.

Figure 2: Flow Diagram

Inlet Fitting

The inlet fitting on the right side of the housing allows the gas sample to enter the sample-

draw detector. The inlet fitting accepts 1/4 in. rigid tubing. See “Connecting the Sample

Lines to the Sample Draw Detector” on page 11 to connect tubing to the inlet fitting.

Exhaust Fitting

The exhaust fitting on the right side of the housing allows the gas sample to exit the

sample draw detector. The exhaust fitting accepts 1/4 in. rigid tubing. See the

“Connecting the Sample Lines to the Sample Draw Detector” on page 11 to connect tubing

to the exhaust fitting.

Hydrophobic Filter

The hydrophobic filter is behind the main circuit board near the bottom edge of the board.

The filter prevents particulates and water in the incoming gas sample from damaging the

flow and detection systems. Replace the filter when it appears dirty, discolored, or

clogged.

Pump

The pump is behind the main circuit board near the top of the sample-draw detector.

The pump pulls the gas sample into the sample-draw detector. The pump operates on

24 VAC, which is generated from the 24 VDC supplied to the sample draw detector.

Flowmeter

The flowmeter is attached to the main circuit board near the top left corner (see Figure 1.)

You can see it through the window in the door. A ball in the flowmeter column indicates

the flow rate of the sample draw detector. The flowmeter measures the flow in the range

0.2 to 2.0 SCFH (Standard Cubic Feet per Hour). The optimum flow rate is 1.5 SCFH.

Exhaust

Bypass

Valve

Presure Switch

Detector

Flowmeter

Pump

Inlet

Hydrophobic

Filter

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Rki-instruments 35-3000RKA-10 User Manual Page 6