RKI Instruments 35-3000RK-LEL/O User Manual
Page 10
6 • 35-3000RK-LEL/O Sample-Draw Detector
NOTE:
The pump and pressure switch are factory-wired to the circuit board. See
“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 combustible gas sensor. The
interrupted sensor signal causes a fail condition at the controller for the combustible gas
channel.
WARNING: The relay will not interrupt the signal from the oxygen sensor so the oxygen
channel at the controller will not indicate a fail condition in the event of
low flow.
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