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RKI Instruments 35-3000RK-OXY User Manual

Page 8

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8 • 35-3000RK-OXY Sample-Draw Oxygen Detector

Main Circuit Board

The main circuit board includes the interconnect terminal strip, detector terminal strip,
pump terminal strip, and relay (see Figure 1).

NOTE:

The flowmeter and status lights are mounted to the main circuit board but are

considered part of the flow system.

Interconnect terminal strip

The interconnect terminal strip is the nine-point terminal strip near the bottom edge of the
main circuit board. Use the interconnect terminal strip to connect the sample-draw
detector to a controller.

Detector terminal strip

The detector terminal strip is the nine-point terminal strip near the right edge of the circuit
board. Use the detector terminal strip to connect the oxygen sensor to the main circuit
board.

NOTE:

The oxygen sensor is factory-wired to the circuit board. See the “Installation”

section on page 9 for all wiring procedures related to the sample-draw detector.

Pump terminal strip

The pump terminal strip is the four-point terminal strip near the top edge of the circuit
board. Use the pump terminal strip to connect the pump and pressure switch to the main
circuit board.

NOTE:

The pump and pressure switch are factory-wired to the circuit board.

Relay

The relay is to the left of the detector terminal strip. The relay is single-pole, double-throw
(SPDT) and is rated for 2 amps at 25 VDC (resistive). If the pressure switch senses a low
flow condition, the relay interrupts the signal from the sensor. The interrupted sensor
signal causes a fail condition at the controller.

NOTE:

No relay contacts are available for use in controlling an external device.