Rki-instruments 35-3001-02 User Manual download pdf (Page 7)

35-3001-02 Oxygen Sample-Draw Detector • 3

External Components

This section describes the sample-draw detector’s external components.

Housing

The sample-draw detector’s fiberglass housing is weather- and corrosion-resistant. It is suitable for

installation where general purpose equipment is in use.

The housing door is hinged on the left side and is secured by two latches on the right side. The

flowmeter and status LEDs are visible through a window in the housing door.

Four mounting feet are attached to the back of the housing (one at each corner). Use the mounting

feet to install the housing to a vertical surface.

Sample Fittings

The sample fittings are located on the left side of the bottom of the housing. The inlet fitting is near

the front of the housing and the exhaust fitting is near the back of the housing. The inlet fitting has

a short factory installed tubing stub for use with the particle filter. The sample fittings accept 1/4 in.

rigid tubing. See the Installation section on page 6 to connect tubing to the sample fittings.

Inlet Fitting Tubing Stub

A short tubing stub comes factory installed in the inlet fitting. It is used for connecting the particle

filter. If the particle filter is not used, or if you install the particle filter in a different location, the

tubing stub needs to be removed and replaced with tubing.

Conduit Hub

One 3/4” conduit hub is located on the right side of the bottom of the housing. It is used for routing

wiring into the housing by using conduit or an appropriate cable bushing.

Internal Components

This section describes the sample-draw detector’s internal components (see Figure 1). Figure 2

illustrates how the gas sample moves through the flow system.

Figure 2: Oxygen Sample-Draw Detector Flow Diagram

Flowmeter

Pump

Oxygen

Sensor

Particle Filter

Exhaust

Flowmeter PCB

Hydrophobic Filter

Pressure Switch

Restrictor

Inlet

Sensor

Flow

Control

Valve

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Rki-instruments 35-3001-02 User Manual Page 7