Description Of Combustible Gas Detector


Combustible Gas Detector is one of the basic tools of safety which is needed in case there is combustible gas at the site of the plant. The temperature of auto ignition as well as low explosive limit describes the prospective dangers of the combustible gas.
The auto ignition temperature is lowest at which the combustible gases might ignite spontaneously without any source of ignition. Meanwhile, the LEL or the Lower Explosive Limit is lowest concentration of the combustible gas in air which propagates the flames when they are exposed to the ignition of source.

Types of combustible gas detectors
There’re mainly 2 types of combustible gases detectors available in the market. The very first type is the electro catalytic one which is known as passive type. The other one is the infrared Gas Detector which employs the infra-red absorption for detection, its active type.
The electro catalytic type is the one which is used in different industries and usually applied as the single point detector for the combustible gas. The basic principle of operating is based on the oxidation reaction of the oxygen or combustible gas from air on heterogeneous catalytic elements. The heat which is generated from reaction helps in heating the platinum coils which are embedded in catalyst and it changes resistance of coil. It is then measured as well as monitored.

Factors affecting the sensitivity of the catalytic gas detectors
There’re mainly 2 factors which affect sensitivity of the catalytic gas detector that is blockage of flame arrestors through which the combustible gases flow through and position the active beads. Besides, the mechanical failure might be caused through vibration. Vibration may also break the platinum wiring.
The benefits of the electro catalytic sensor include relatively low cost of the unit, better and simple accuracy as compared to the other methods of detection.
On the contrary, the infrared detectors help in detecting the presence of combustible gases on the basis of the infrared radiation at a particular wavelength.
Some of the main benefits of the infrared type is maintenance free as calibrated by factory could be used for the open path devices or the single point could be located easily at the inaccessible locations at the site of the plant.
  • When you have to choose the Flame Arresters that you may buy, below are a few important types. Make sure you do some research before selecting one.
  • State your particular requirements clearly
  • Choose single or multiple types. Some of the gas detectors may even detect the other gases in place of the combustible gases like carbon monoxide, sulphur dioxide, ammonia, etc.
  • Check the range of detection of the combustible gas. It signifies checking the percentage of LEL i.e. lower Expose Limits. The detector should at least be capable of detecting the LEL. You need to pay more attention to this specification as it would give you some time for taking the actions if there is a leakage.
  • Choose the detecting sensor which would be apt for your requirements


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