This detector is very selective measuring a selected gas at a
specific absorbtionsband in the infrared wavelength area - no false
alarms.
Simply put, an infrared detector can measure tgases whose molecules
contain more than one atom.
This means that gases such as carbon dioxide, carbon monoxide,
methane, sulfur dioxide, etc. can be measured with an infrared
detector while the gases like oxygen, hydrogen and chlorine can not
be measured with an infrared detector.
Various gases absorb infrared radiation at different frequencies and
it is by measuring how much infrared radiation at a specific
frequency that is absorbed by the gas in question that you can
determine the gas concentration.
A major use for this testing method is when you want accurate
readings at low values without false alarms from other gases.
