RKI Instruments 35-3000RKA-10 - Manual (Page 9)

35-3000RK-10 PPM Hexane Sample Draw Detector • 9
Main Circuit Board
The main circuit board includes the interconnect terminal strip, detector/amplifier
terminal strip, pump terminal strip, and relay (see Figure 1).
NOTE: The flowmeter and status LEDs 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/Amplifier Terminal Strip
The detector/amplifier terminal strip is the nine-point terminal strip near the right edge
of the circuit board. Use the detector/amplifier terminal strip to connect the amplifier to
the main circuit board. In this version of the 35-3000RK the detector is not wired to the
detector/amplifier terminal strip but is wired to the amplifier’s detector terminal strip.
NOTE: The amplifier is factory wired to the sample draw detector’s detector/amplifier
terminal strip. See “Wiring the Sample Draw Detector” on page 11 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 pump terminal strip. See
“Wiring the Sample Draw Detector” on page 11 for all wiring procedures related
to the sample draw detector.
Relay
The relay is to the left of the detector/amplifier terminal strip. The amplifier output to the
controller is routed through the relay contacts and if the pressure switch senses a low flow
condition, the relay interrupts the output from the amplifier. The interrupted amplifier
output causes a fail condition at the controller.