RKI Instruments 35-3010RKA-03 - Manual (Page 10)

6 • 35-3010RKA-03 Sample-Draw Detector
Carbon Monoxide Sensor
The carbon monoxide gas sensor is installed in the upper left side of the flow block. It has
4 pins which mate with sockets in the preamp circuit board.
Hydrogen Sulfide Gas Sensor
The hydrogen sulfide gas sensor position is located in the upper right side of the flow
block. In the 35-3010RKA-03, the hydrogen sulfide gas sensor position in the flow block is
occupied by a dummy sensor.
Figure 3: LEL & Oxygen Transmitters
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.
FB
4/2 0 TP
-
TP
+
B ATT
+ +
SPAN
OXY
W B K
Oxygen
Transmitter
Sensor Terminal
Strip
Test Point TP-
24 V
OXY
TOXIC R D
Test Point TP+
TOXIC
Interconnect
Terminal Strip
Zero Pot
Span Pot
Interconnect
Terminal Strip
Transmitter Type Selector,
Set To OXY
G
LEL Transmitter
Zero Pot
Span Pot
ZERO
Test Point TP-
Test Point TP+