Classification of explosion-proof flow switch
Explosion-proof flow switches are flow switches used in hazardous sites, which are defined as places where fire or explosion hazards may occur due to the presence of flammable gases, vapors, dust or fibers. Because of the inherent hazards in these areas, equipment used in such locations must be certified for explosion protection. Such explosion-proof products have been tested and certified to meet the standards specified by the European directive ATEX or other standards bodies such as NEMA.
Explosion-proof flow switch is generally divided into mine explosion-proof flow switch and petrochemical explosion-proof flow switch.
Mining flow switch to conform to the requirements of the explosion-proof Ⅰ class standard (the coal mine electrical equipment), the general level of explosion-proof ExdIBT4 or ExdICT6, Hong Kong ai kuyt from GE - 316 series and GE - 341 series flow switch, all can be customized to meet the requirements of mine explosion-proof flow switch, and can provide European directives of ATEX mine explosion-proof certificate.
Explosion-proof flow switch in the field of petrochemical general requirement accord with standard of Ⅱ class (in addition to underground coal mines, all of the other electrical equipments used in explosive gas environment), usually for ExdIIBT4 explosion-proof grade, or ExdIICT6, Hong Kong ai kuyt company explosion-proof flow switch the default for this kind of explosion-proof standards, and can provide ATEX explosion-proof certificate.
In addition to the above two kinds of blast flow switch and Ⅲ explosion-proof flow switch, namely except coal mine dust explosive environment flow switch. Ⅲ class A: combustible --; Ⅲ class B: non conductive dust; Dust Ⅲ C: electrical conductivity. , in general practical applications, can be used in the field of petrochemical explosion-proof flow switch, used in the dust environment there is no problem.
Explosion-proof flow switch according to explosion-proof principle, it can also be divided into intrinsically safe explosion-proof flow switch and flameproof explosion-proof flow switch. Of GE - 316 series flow switch default is intrinsically safe flow switch, but can be customized for the flameproof flow switch (used in the coal mine environment), GE - 341 flow switch is flameproof flow switch, namely using the explosion-proof certification of explosion-proof junction box to electrical components are completely isolated from the outside world, in order to achieve the effect of explosion-proof.