Combustible gas detector installation points know
What is a combustible gas?
1) A premixed gas that is capable of mixing uniformly with air (or oxygen) within a certain concentration range.
2) Explodes when exposed to an ignition source.
3) A gas that releases a large amount of energy during combustion.
A combustible gas detector is, as the name suggests, a detector that can detect the concentration of a single or multiple combustible gases. Combustible gas detectors rely on the following points to be considered when installing them:
1, the detection network setup
Detector installation location is very important to determine, in some cases, may directly affect whether the timely alarm. For this reason, in the combustible gas detection network set point, the following issues should be noted.
The effective radius of the horizontal plane of coverage of the combustible gas detector should be 7.5 m indoors and 15 m outdoors. one detector can be set up within the effective coverage area." In addition, the detector is to be set up specifically taking into account the fact that the release source is located on the upwind side (or downwind side) of the wind direction of the small frequency at the local site. Tank area in the storage tanks in and out of the material valve group near the location (between two tanks set up a) and there may be leakage of gas in the pump room, compressor room, filling the bottle valve group set up respectively, filling the bottle room is generally more semi-enclosed plant, can be set up a 10 m or so.
2,Detector installation height determination
Detector installation height depending on the density of the measured gas or vapour. Detection of heavier than air (in the standard state, the gas density is greater than 0.97 kg / m3 that is considered heavier than air, less than 0.97 kg / m3 that is considered lighter than air) of the combustible gas detector, the installation height should be from the floor (or the floor of the floor) 0.3-0.6 m, measure the detection of liquefied petroleum gas, the installation height of the floor from the floor of 0.3 m. Too low, easy due to rain, splash and splash, the detection height is 0.3 m. Too low, easy due to rain, splash and splash, the detection height is 0.3 m. Too low, easy due to rain, splash and splash. If it is too low, the detector will be easily damaged by rain or splashing, and if it is too high, it will exceed the height where heavier-than-air combustible gases are likely to accumulate. Detecting lighter than air combustible gas detector, its installation height should be 0.5 ~ 2 m above the release source.
3,Installation Precautions
1) The installation position of the detector should be convenient for calibration and maintenance. A certain amount of free space should be maintained around it. It is appropriate to leave no less than 0.3m of headroom.
2) The detector should be installed in a non-shock. No vibration. No strong electromagnetic field interference.
3) The display alarm of the detection and alarm device should be installed in the control room or operation room or duty room of the safety zone.
4) Electrical wiring of combustible gas detection alarm: the installation and wiring of combustible gas detection alarm should be carried out according to the requirements specified by the manufacturer and in accordance with the relevant provisions of the installation and wiring of explosion-proof instruments. Wire, cable laying in line with the neat, beautiful, easy to operate the principle. When using buried laying method, cable, wear protection pipe laying, buried depth greater than or equal to 700 mm.
