35-3001A-01-XX1 Sample-Draw Detector Operator’s Manual • 9
Internal Components
This section describes the sample-draw detector’s internal components (see Figure 1). Figure
2 illustrates how the gas sample moves through the flow system.
Figure 2: Sample-Draw Detector Flow Diagram
Main Circuit Board
The main circuit board includes the detector/amp terminal strip, interconnect terminal strip,
oxygen sensor terminal strip, pump connector, and flowmeter circuit board connector (see
Figure 1).
Detector/Amp Terminal Strip
The detector/amp terminal strip is the upper twelve-point terminal strip in the bottom right
corner of the main circuit board. Use the detector/amp terminal strip to connect the amplifier
to the main circuit board.
NOTE:
The amplifier is factory-wired to the main circuit board. See the “Installation”
section on page 12 for all wiring procedures related to the sample-draw detector.
Interconnect Terminal Strip
The interconnect terminal strip is the lower twelve-point terminal strip in the bottom right
corner of the main circuit board. Use the interconnect terminal strip to connect the sample-
draw detector to a controller.
Oxygen Sensor Terminal Strip
The oxygen sensor terminal strip is a two-point terminal strip in the upper right corner of the
main circuit board. This terminal strip is not used in this version of the sample-draw detector.
Pump
IR
Sensor
Flowmeter
Particle Filter
Flowmeter PCB
Exhaust
Pressure Switch
Hydrophobic Filter
Inlet
Restrictor
Sensor
Flow
Control
Valve
