Infrared point sensor | Wikipedia audio article

An infrared point sensor is a point gas detector
based on the nondispersive infrared sensor technology.==Principle==
Dual source and dual receivers are used for self compensation of changes in alignment,
light source intensity and component efficiency. The transmitted beams from two infrared sources
are superimposed onto an internal beam splitter. 50% of the overlapping sample and reference
signal is passed through the gas measuring path and reflected back onto the measuring
detector. The presence of combustible gas will reduce
the intensity of the sample beam and not the reference beam, with the difference between
these two signals being proportional to the concentration of gas present in the measuring
path. The other 50% of the overlapped signal passes
through the beam splitter and onto the compensation detector. The compensation detector monitors the intensity
of the two infrared sources and automatically compensates for any long term drift. Mean time between failures may go up to 15
years.==Micro heaters==
Micro heaters can be used to raise the temperature from optical surfaces above ambient to enhance
performance and to prevent condensation on the optical surfaces.==Range==
Toxic gases are measured in the low parts per million (ppm) range. Flammable gases are measured in the 0 – 100%
lower flammable limit (LFL) or lower explosive limit (LEL) range.==See also==
List of sensors Maintenance-free operating period
Service life ATEX directive II 1G EEx ia IIC T6
Infrared gas analyzer – for gas monitoring and analysis, rather than leak detection.

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