schematic of the two most common components of the gas sensor chain: the Universal Gas Conditioner (UGC)
and the Chemical Oxygen (O2) sensor.
3.2.2 Universal Gas Conditioner
The Universal Gas Conditioner (UGC) combines the functions of prior sub-systems and components into one
comprehensive unit. It comprises two Nafion tube driers, a carbon dioxide sensor (CO2) and humidity,
temperature, and pressure sensors. One of four selectable gas sources is drawn into the unit where it is dried
and metered for output through the integrated carbon dioxide sensor and then to other external gas sensors.
The returned gases from the sensors are expelled through the exhaust ports. The carbon dioxide sensor
employs a non-dispersive infrared light source which is directed through the gas sample. Carbon dioxide gas
absorbs infrared light. An infrared light detector measures the amount of absorbed light which is proportional
to the concentration of carbon dioxide. The Nafion tube drier and carbon dioxide sensor should be replaced
every two (2) years for uninterrupted service.
Universal Gas Conditioner Specifications:
Mass Flow Range: 0-1000mL/min
Mass Flow Resolution: 0.25mL/min
CO2 Range: 0-1% CO2
Resolution: 0.0001%
Humidity Range: 0-100%
Humidity Resolution: 0.006%
Pressure Range: 15-115kPa
Pressure Resolution: 0.003kPa
Physical Size (WxHxD): 30cm x 20cm x 35cm
Physical Weight: 5kg
Power Requirements: 12VDC 2A, 12W
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