RKI Instruments 35-3000RK-OXY - Manual (Page 8)

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.