According to the state of matter in the place, the dangerous place is divided into explosive gas environment and flammable dust environment.
According to the length of time the dangerous substances exist in the place, the dangerous places under the two different states of matter are divided into three areas;
Namely: For explosive gas environment, it is Zone 0, Zone 1 and Zone 2;
The flammable dust environment is Zone 20, Zone 21, and Zone 22.
Explosive gas environment: GB3836.14-2000 standard stipulates 0 area: The place where the explosive gas environment appears continuously or exists for a long time.
Zone 1: Locations where explosive gas atmospheres may occur during normal operation.
Zone 2: In normal operation, it is not possible to have an explosive atmosphere if it occurs occasionally and only for a short time. Herein, "normal operation" refers to normal driving, running, parking, loading and unloading of flammable substances, opening and closing of closed container lids, safety valves, discharge valves, and all plant equipment operating within their design parameters. .
The definition of hazardous locations solves the problem of the existence of explosive substances in the division of hazardous locations. Then, how does the concept of a long-term or occasionally-occurring time be defined? The relevant regulations in Europe also provide specific rules. See Table 1 below:
Long-term presence of hazardous substances (greater than 1000h/year) exists during normal operation (10-1000h/year) but only when abnormal (less than 10h/year)
Gas 0 zone 1 zone 2 zone explosion-proof products are dI and dIIBT4 two kinds, 1dI applies to the coal mining non-excavation face; 2dIIBT4 used in factories, apply to the environment of IIA, IIB T1 ~ T4 group explosive gas mixture. The performance of this product complies with the requirements of JB/T8528-1997 <Regular Type Valve Electric Device Technical Conditions>. The explosion-proof performance meets the requirements of GB3836.1-2000 "General requirements for explosion-proof electrical equipment for explosive atmospheres" and JB/T8529-1997 "Technical conditions for explosion-proof control boxes". And by the national explosion-proof electrical product testing center certification, obtained the explosion-proof certificate and mining certificate. The overall type of electrical equipment is derived from the Z-type basis, adding a lot of electrical and electronic components, the overall general-type electrical part The multi-function module MK1 remote control module MK2 button box indicator, opening table, contactor and other components. The multi-function module MK1 is composed of a phase identifier XS, a contactor interlock protector HB and a DC power supply DC. The remote module MK2 consists of four solid state relays and three dial switches. The overall adjustment of the electrical part consists of the adjustment module TMK, contactors and other components. The control line is 220V, 50Hz (special order 60Hz); The remote control is DC24V.DC36V.DC127V.220V etc.
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