35-3010RKA-03 Sample-Draw Detector • 7
Oxygen Transmitter
The oxygen transmitter is mounted to the right of the LEL transmitter and above the main
circuit board. The amplifier includes the amplifier type selector, two internally wired
terminal strips, span pot, zero pot, and test points.
Transmitter Type Selector
The transmitter type selector is near the bottom left corner of the amplifier. It is to the left
of the detector terminal strip and below the span pot.
The transmitter included with the sample-draw detector is designed for use with RKI’s
oxygen and toxic gas sensors. The transmitter type selector determines for which sensor
the amplifier is intended. For oxygen transmitters, a jumper block is installed over the
OXY
selector.
Detector Terminal Strip
The detector terminal strip is the four-point terminal strip near the bottom edge of the
transmitter. It is factory wired to the transmitter.
Interconnect Terminal Strip
The interconnect terminal strip is the four-point terminal strip near the top edge of the
transmitter. It is factory wired to the main circuit board.
Span/Zero Pots
The span and zero pots are located on the left side of the transmitter and are used for
calibration. Use the span pot to make adjustments to gas response readings and the zero
pot to make adjustments to the zero reading.
Test Points
The test points are located on the top of the transmitter on either side of the transmitter
interconnect terminal strip. They are labeled TP+ and TP-. A 100 mV - 500 mV output is
available at these test points for use during calibration.
Preamp Circuit Board
The preamp circuit is used to connect the CO and H
2
S sensors to the main circuit board
and to secure the sensors in the flow block. Two cables mate to the main circuit board: the
one on the left is for the CO sensor signal and the one of the right is for the H
2
S sensor
signal. Since the H
2
S sensor is replaced with a dummy plug in the 35-3010RKA-03 the H
2
S
sensor signal cable carries no signal in this version of the 35-3010RK.
