Figure 8-1. Hardware Components; Optical Bench - Thermo Scientific 48i Instruction Manual

System Description
Hardware
Flow Transducer

Optical Bench

Thermistor
Front Panel
Front Panel Board
Power Supply
Optical Bench
Band-pass Filter
Bench Heater Board
Chopper Motor
8-2 Model 48i Instruction Manual
Pressure Transducer Pump
Measurement Interface Board
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.
Motor and Wheel Assy
Motherboard
Fan
IR Source Cover
Detector Assy
and Pre-Amp
O2 Sensor
(Optional)
I/O Expansion Board (Opt)
Digital Output Board
Thermo Fisher Scientific