RKI Instruments 65-2400RK - Manual (Page 7)

65-2400RK Combustible Gas Transmitter • 3
Detector Housing
The sensing elements and flame arrestor are installed within the detector housing.
Mounting threads (1/2 in. NPT) at the top of the detector allow you to mount the
combustible gas detector into the bottom conduit hub of the junction box. A rainshield
screws onto the bottom of the detector. The rainshield helps protect the detector from
debris in the monitoring environment.
Detector Leads
Four color-coded leads extend from the top of the detector. The leads allow you to connect
the combustible gas detector to the amplifier.
Amplifier
The amplifier converts the electrical output from the detector to a 4 to 20 mA signal that is
proportional to the detection range and transmits the signal to a gas monitoring controller.
The amplifier includes the interconnect terminal strip, span pot, zero pot, and test points
(see Figure 1).
Interconnect Terminal Strip
The interconnect terminal strip is a seven-point terminal strip. Use the interconnect
terminal strip to connect the combustible gas detector to the amplifier and the amplifier to
a controller.
NOTE: The combustible gas detector is factory-wired to the amplifier. See the
Installation section of this manual for all wiring procedures related to the
transmitter.
Span Pot
The span pot is near the bottom of the amplifier (see Figure 1). Use the span pot to adjust
the transmitter’s response output during the calibration procedure.
Zero Pot
The zero pot is to the right of the span pot (see Figure 1). Use the zero pot to adjust the
transmitter’s target gas-free output during the start-up and calibration procedures.
CAUTION: The amplifier includes two additional potentiometers. They are factory-set. Do not
adjust them.
Test Points
The test points (labeled TP+ and TP-) are to the left of the interconnect terminal strip
(see Figure 1). The test points produce a 100 to 500 mV output that is proportional to the
transmitter’s 4 to 20 mA output. Use the test points and a voltmeter to measure the
transmitter’s output during the start-up and calibration procedures.