8 • 35-3010RKA-08 Sample-Draw Detector
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
signal. Since the CO and H
2
S sensors are replaced with a dummy plug in the 35-3010RKA-
08 the CO and H
2
S sensor signal cables carry no signal in this version of the 35-3010RK.
Main Circuit Board
Figure 5: Main Circuit Board
The main circuit board includes the interconnect terminal strip, sensor/transmitter
terminal strip, amp 1 circuit, amp 2 circuit, pump terminal strip, relay, and reset switch
(see Figure 5).
NOTE:
The flowmeter and status lights are mounted to the main circuit board but are
considered part of the flow system.
Interconnect Terminal Strip
The interconnect terminal strip is the sixteen-point terminal strip near the bottom edge of
the main circuit board. Use the interconnect terminal strip to connect the sample-draw
detector to power and an external device.
Test Point CAL + 2
Amp 1
(CO)
Zero
Span
Zero
Fail LED
Sensor/Transmitter
Terminal Strip
Pressure Switch
Reset
Switch
Pilot LED
Amp 2
(H2S)
Span
Test Point CAL + 1
Test Point CAL - 2
Test Point CAL - 1
AC Terminal
Strip Not Used
Interconnect Terminal
Strip
Low Flow Adjust
Flow Adjust Pot
Flowmeter
Pump Terminal Stip
Relay
