System Description
Hardware
8-4 Model 48i Instruction Manual Thermo Electron Corporation
Optical Pickup The optical pickup detects the position of the gas filter wheel, provides
synchronizing signals for the signal demodulation, and provides a method
for checking the chopper motor speed.
Gas Filter Wheel The gas filter wheel contains samples of CO and N
2
gas that filter the
radiation from the infrared source. A chopper disk that rotates along with
the wheel periodically interrupts the radiation to create a modulated signal.
Infrared Source The infrared source is a special wire-wound resistor operated at high
temperature to create infrared radiation.
Pre-amplifier Assembly
with IR Detector
The pre-amplifier assembly is mounted on the optical bench along with an
infrared detector that detects the energy of the infrared light passing through
the optical bench. It amplifies the pulsating signal from the infrared
detector.
Sample Flow Sensor The sample flow sensor, located at the optical bench outlet, measures the
flow of sample through the optical bench.
Pressure Transducer The pressure transducer measures the pressure of the sample gas.
Capillary The capillary and the pump control the sample gas flow.
Pump The pump draws the sample gas through the optical filter bench.
Purge Flow Switch
(optional)
The purge flow switch monitors the flow of purge gas when the filter wheel
purge gas option is installed.
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