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INFRARED OPEN PATH (LINE OF SIGHT) GAS DETECTION

Principle of operation

Infra-red (IR) gas detection is based on the absorption of energy by hydrocarbons. The bond between hydrogen and carbon absorbs proton energy at a wavelength of 3.3m m.

A beam of IR energy is emitted between a source and detector and any attenuation caused by hydrocarbons in the beam being electronically processed to give a reading in LEL metres.

Advantages

  1. Unit is ideal for open areas without obstructions as the beam must have a clear path.
  2. Covers large areas, thus minimising the number of units required.
  3. Very fast response.
  4. Limited maintenance required.

Disadvantages

  1. Unsuitable for hydrocarbons which have various compositions ie., if one day the leak could be Methane and the next Propane the readings will change and will not be representative.
  2. Cannot measure non hydrocarbons eg., hydrogen.