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RKI Instruments 35-3010RKA-07 User Manual

Page 10

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6 • 35-3010RKA-07 Sample-Draw Detector

LEL Transmitter

The LEL transmitter is mounted to the left of the oxygen transmitter and above the main
circuit board. It consists of the span pot, zero pot, one internally wired terminal strip, and
the test points.

Span/Zero Pots

The span and zero pots are located at the bottom edge 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

Transmitter Interconnect Terminal Strip

The transmitter interconnect terminal strip is the seven-point terminal strip near the right
edge of the transmitter. The transmitter is factory wired to the sensor and main circuit
board.

Test Points

The test points are located on the left side of the transmitter and are labeled TP+ and TP-.
A 100 mV - 500 mV output is available at these test points for use during calibration.

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 on the right is for the H

2

S sensor