In the latest national standard, GB/T 3836.1-2021 explosive atmosphere document issued by the State Administration for Market Regulation and the Standardization Administration of the People’s Republic of China, 3.27 equipment categories are divided into three categories according to the explosive atmosphere used for them. – Class I: Coal mine gas environment equipment; Equipment used in coal mines, when the environment may contain other explosive gases in addition to gas, shall be manufactured and tested in accordance with the requirements of the corresponding flammable gases of Class I and II. – Class II: All other equipment for explosive gas atmospheres except for coal mine gas atmosphere Class II equipment can be further divided into three categories according to the characteristics of the explosive gas atmosphere in which it is intended to be used. The representative gas is class II.A of propane The representative gas is ethylene class II.B The representative gases are hydrogen and acetylene class II.C Equipment marked Class II.B applies to the conditions of use of Class II.A equipment, and equipment marked Class II.C applies to the conditions of use of equipment of Class II.A and Class II.B. – Class III: All other equipment for explosive dust atmospheres except coal mines Class III equipment can be further divided into three categories according to the characteristics of the explosive dust environment in which it is intended to be used. – Class III.A: flammable fly flocculent; – Class III.B: non-conductive dust; -Class III.C: Conductive dust. Equipment marked Class III.B applies to the conditions of use of Class III.A equipment, and equipment marked Class III.C applies to the conditions of use of equipment of Class III.A or Class III.B. Star Meter Manufacturing Co., Ltd. is a high-tech enterprise integrating R&D, production and sales. Specializing in the production of pressure transmitters, liquid level transmitters, temperature transmitters, temperature and humidity transmitters, differential pressure transmitters, soil moisture transmitters, 3051 transmitters and related instrumentation accessories. A number of products under the Xingyi brand have obtained a number of patent certificates issued by the state, such as CE certification, IS9001 certification, SGS certification, TüV SüD certification, explosion-proof certification, etc. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi: 400-600-4496!