First, the selection of combustible gas detectors should meet the following requirements:
1. Catalytic combustion sensors should be used for gases that are inherently combustible.
2. When using a place where the air contains a small amount of sulfur, phosphorus, arsenic, halogen compounds and other media that can poison the catalytic combustion type detection element, an anti-toxic catalytic combustion type detector or a semiconductor type detector should be selected;
3, hydrogen gas detection should use electrochemical sensors or conductor detectors.
Second, the selection of toxic gas detectors can be determined based on the specific characteristics of the detected toxic gases:
1, hydrogen sulfide, carbon monoxide gas can be selected fixed potential electrolysis or semiconductor type;
2ã€Chlorine can use diaphragm electrode type, fixed potential electrolysis type or semiconductor type
3, ethylene oxide, acrylonitrile gas can use semiconductor or fixed potential electrolysis type
4, hydrogen cyanide gas can be used gel electrolysis (battery type), diaphragm electrode type or fixed potential electrolysis type;
5, vinyl chloride gas should use semiconductor or photoionization type
Third, the use of toxic gas detectors should consider the cross-effects of extremely toxic gases and other gases that may be present in the installation environment.
Fourth, the detector sampling method to determine
1, should use diffusion detector
2, the following conditions should adopt single or multi-point suction detector
a. Sites that may cause serious consequences due to a small amount of leakage;
b. Due to installation conditions and environmental conditions, it is difficult to use diffusion detectors.
c, I (extremely hazardous) toxic gas release source;
d. Where there is a concentrated source of toxic gas release.
3, using inhaled toxic gas detector detection of flammable toxic gases, should use pneumatic suction sampling system.
1. Catalytic combustion sensors should be used for gases that are inherently combustible.
2. When using a place where the air contains a small amount of sulfur, phosphorus, arsenic, halogen compounds and other media that can poison the catalytic combustion type detection element, an anti-toxic catalytic combustion type detector or a semiconductor type detector should be selected;
3, hydrogen gas detection should use electrochemical sensors or conductor detectors.
Second, the selection of toxic gas detectors can be determined based on the specific characteristics of the detected toxic gases:
1, hydrogen sulfide, carbon monoxide gas can be selected fixed potential electrolysis or semiconductor type;
2ã€Chlorine can use diaphragm electrode type, fixed potential electrolysis type or semiconductor type
3, ethylene oxide, acrylonitrile gas can use semiconductor or fixed potential electrolysis type
4, hydrogen cyanide gas can be used gel electrolysis (battery type), diaphragm electrode type or fixed potential electrolysis type;
5, vinyl chloride gas should use semiconductor or photoionization type
Third, the use of toxic gas detectors should consider the cross-effects of extremely toxic gases and other gases that may be present in the installation environment.
Fourth, the detector sampling method to determine
1, should use diffusion detector
2, the following conditions should adopt single or multi-point suction detector
a. Sites that may cause serious consequences due to a small amount of leakage;
b. Due to installation conditions and environmental conditions, it is difficult to use diffusion detectors.
c, I (extremely hazardous) toxic gas release source;
d. Where there is a concentrated source of toxic gas release.
3, using inhaled toxic gas detector detection of flammable toxic gases, should use pneumatic suction sampling system.
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