Product category:
Gas, Chemical, Radiation and Magnetic Sensors
News Release from: Lineage Power Corporation | Subject: CO2 gas sensor
Edited by the Engineeringtalk Editorial
Team on 04 July 2005
CO2 sensor is ready for new air-con
systems
A new CO2 gas sensor has been designed for forthcoming passenger-car air conditioning units that, instead of containing HFC-based R134a, will use the alternative coolant R744 (carbon dioxide).
Tyco Electronics Power Systems has developed the first CO2 gas sensor for forthcoming passenger-car air conditioning units that, instead of containing HFC-based R134a, use the alternative coolant R744 (carbon dioxide) The new sensor is based on infra-red spectral analysis and integrates various components, eg IR light sources, optical chamber thin-film interference filter, IR detector and electronics for processing measured values
This article was originally published on Engineeringtalk on 3 Jul 2000 at 8.00am (UK)
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Implemented in the vehicle, the fail-safe sensor not only warns reliably concerning CO2 leaks from R744 air conditioning units - in temperature ranges from -40 to +85C and relative humidity from 0 to 95% - but it also concurrently and automatically controls interior ventilation and insures an optimal climate in the passenger compartment.
Based on infra-red spectral analysis, the CO2 gas sensor from Tyco Electronics recognises gas-specific signatures in the 4.25um wavelength region.
Because each gas possesses its own characteristic wavelength, the sensor functions precisely without cross-sensitivity to other gases.
The thin-film interference filter in the sensor module ensures that the detector considers only the relevant part of the infra-red spectrum, the one that is absorbed by the gas to be measured.
In addition, the Tyco Electronics CO2 gas sensor has a high level of operational reliability, as well as a very short response time of less than 11s.
This is because, as opposed to a chemical gas sensor, the device requires no direct contact with the medium.
The long-term operation is guaranteed via patented technology, which includes the integration of a second IR source, or reference source.
The first IR source (measurement source) pulses at 3s intervals and thereby captures the CO2 concentration.
The second source functions once within a 24h period in order to monitor the aging of the measurement source and adjust it if necessary.
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