System Description
Hardware
8-2
Model 15
i
Instruction Manual
Thermo Fisher Scientific
Front Panel Board
Optical Bench
Thermistor
Front Panel
Flow Transducer
Pump
Pressure Transducer
Motor and Wheel Assy
Fan
Detector Assy
and Pre-Amp
IR Source Cover
Figure 8–1.
Hardware Components
The optical bench is an airtight chamber that contains the sample gas. The
bench includes mirrors that cause the infrared light from the infrared
source to pass through the sample gas multiple times before reaching the
infrared detector.
The band-pass filter limits the light entering the optical bench to a narrow
band of the infrared portion of the spectrum.
The bench heater board applies power to the bench heater resistors and
transmits the bench temperature monitored by a thermistor. This assembly
is used for maintaining the optical bench at a constant temperature.
The chopper motor spins the gas filter wheel and chopper disk at a uniform
speed.
Optical Bench
Band-pass Filter
Bench Heater Board
Chopper Motor
Motherboard
Measurement Interface Board
I/O Expansion Board (Opt)
Digital Output Board
Power Supply
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