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2. Nondispersive infrared sensor - Wikipedia

   en.wikipedia.org/wiki/Nondispersive_infrared_sensor

   A nondispersive infrared sensor (or NDIR sensor) is a simple spectroscopic sensor often used as a gas detector.It is non-dispersive in the fact that no dispersive element (e.g a prism or diffraction grating as is often present in other spectrometers) is used to separate out (like a monochromator) the broadband light into a narrow spectrum suitable for gas sensing.

3. Gas detector - Wikipedia

   en.wikipedia.org/wiki/Gas_detector

   A gas detector is a device that detects the presence of gases in an area, often as part of a safety system. A gas detector can sound an alarm to operators in the area where the leak is occurring, giving them the opportunity to leave.

4. Category:Gas sensors - Wikipedia

   en.wikipedia.org/wiki/Category:Gas_sensors

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6. List of sensors - Wikipedia

   en.wikipedia.org/wiki/List_of_sensors

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7. Explosive gas leak detector - Wikipedia

   en.wikipedia.org/wiki/Explosive_gas_leak_detector

   A detector for propane is best placed down low near the floor, as propane is heavier than air. [3] A detector for natural gas (city gas) is best placed up high, near the ceiling. [3] Some detectors can detect both natural gas or propane, but this requires a compromise location. [4]

8. Infrared open-path detector - Wikipedia

   en.wikipedia.org/wiki/Infrared_open-path_detector

   An open path detector usually costs more than a single point detector, so there is little incentive for applications that play to a point detector's strengths: where the point detector can be placed at the known location of the highest gas concentration, and a relatively slow response is acceptable. The open path detector excels in outdoor ...

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