6 • Sample Draw Combustible Gas 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. See the
“Installation” on page 7 for all wiring procedures related to the sample draw
detector.
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 transmitter. The interrupted
transmitter signal causes a fail condition at the Pioneer.
