We provide some different purity of Alumina Ceramic Tube, like 95%, 99%, 99.5% and 99.7% that it related to the specia requirement and application. Alumina Ceramic Tube Alumina Ceramic Tube,Alumina Ceramic Thermocouple Tube,Dry Pressing Alumina Ceramic Tube,Industrial Ceramic Alumina Tube, Alumina Ceramic Bushing, Alumina Ceramic Sleeve, Alumina Ceramic Pipes Jinghui Industry Ltd. , https://www.ceramictek.com
Gree's explosion-proof air conditioning signs are generally composed of the following five parts:
1 Explosion-proof air-conditioning sign EX - indicates that the equipment is explosion-proof electrical equipment;
2 Explosion-proof air-conditioning structural form - to show what measures the equipment uses for explosion-proof, such as d is flameproof, p is positive pressure type; i is intrinsic safety type;
3 Explosion-proof air-conditioning equipment categories - divided into two categories, I for coal mine underground electricity equipment, II for the factory electrical equipment;
4 explosion-proof air conditioning level - divided into A, B, C three levels, indicating the strength of its explosion-proof ability;
5 air-conditioning temperature group - divided into six groups T1 ~ T6, indicating the maximum allowable surface temperature of the device.
For example, the explosion-proof mark of an explosion-proof air conditioner is EXdIIBT4. Please explain the meaning.
EX - Explosion-proof air conditioning general sign;
d - structural form, flameproof type;
II - category, factory use;
B - explosion-proof air-conditioning level, B-level T4 - temperature group, T4 group, the maximum surface temperature ≤ 135 °C.
Gree's explosion-proof air-conditioning electrical equipment according to GB3836 standard requirements, explosion-proof electrical equipment, explosion-proof signs include: ?
Explosion-proof type + equipment category + (gas group) + temperature group 1. Explosion-proof air-conditioning type According to the explosion-proof measures taken, explosion-proof air-conditioning electrical equipment can be divided into explosion-proof, increased safety, intrinsically safe, positive pressure type , Oil-immersed, sand-filled, encapsulated, n-type, special-type, dust explosion-proof and so on. Their identification is shown in Table 1.
Table 1 Basic Types of Explosion-Proof Air-Conditioning Types of Explosion Proof Types of Explosion Proof Types of Types of Explosion-Proof Types of Explosion Proof Types of Explosion-Proof Type Exd Types of Exq Enclosure Type Exe Types of Exce Type Exm Types
N-type Exn Intrinsically Safe Exia Dust-proof DIPA Intrinsically Safe Exib
Dust explosion-proof DIPB Exo-specific Exs Exs
Gree Explosion Proof Air Conditioner 2. Equipment Category Electrical equipment for explosive gas atmospheres is divided into:
Class I: coal mine underground electrical equipment;
Category II: Electrical equipment for explosive gas atmospheres other than coal mines. ?
Type II flameproof "d" and intrinsically safe "i" electrical equipment is further divided into IIA, IIB, and IIC categories. ?
The flammable dust environment is divided into:
Type A dust-tight equipment; Type B dust-tight equipment; Type A dust-proof equipment; Type B dust-proof equipment. ?
3. The explosion temperature of the explosion-proof air-conditioning temperature group of Greime is the temperature limit that can be ignited. ?
Explosion-proof air conditioners are classified into groups T1 to T6 according to their maximum surface temperature, so that the maximum surface temperatures of the corresponding T1 to T6 groups of electrical equipment cannot exceed the allowable values ​​of the corresponding temperature groups. Table 3 shows the relationship between the temperature group, the surface temperature of the equipment, and the ignition temperature of the flammable gas or vapor. ?
Table 3 Relationship between temperature group, device surface temperature and ignition temperature of flammable gas or vapor?
Temperature class IEC/EN/GB3836
The maximum surface temperature of the device T[°C]
Flammable substance ignition temperature [°C]
T1450T>450
T2300450≥?T?>300
T3200300 ≥?T?>200
T4135200 ≥?T?>135
T5100135≥?T?>100
T685100 ≥?T?>85
The types of explosion-proof air conditioners are: flameproof (d), increased safety (e), no spark (w), positive pressure (n) and dust explosion-proof (A, B two types). II: Factory explosion-proof motor W.[0~/H/p8K)h#z,i+V;p
;Group ignition temperature °C Equipment allowable maximum surface temperature °C1S7V*YX%n&q0{,H
TI450
4. The propagation capability of Explosion-proof air-conditioning gas group explosive gas mixture of Greemark indicates the degree of its explosion risk. The greater the explosive capacity of explosive mixture, the higher the risk. The explosive capacity of an explosive mixture can be represented by the maximum test safety clearance. At the same time, the degree of difficulty in the ignition of explosive gases, liquid vapors, and mists also indicates the degree of explosion risk, which is expressed in terms of the minimum ignition current ratio. Type II flameproof electrical equipment or intrinsically safe electrical equipment is further classified into categories IIA, IIB and IIC according to the maximum test safety clearance or minimum ignition current ratio applicable to explosive gas mixtures. As shown in table 2. ?
Table 2 The relationship between the group of explosive gas mixtures and the maximum test safety clearance or minimum ignition current ratio Greeme's explosion-proof air-conditioning gas group Maximum test safety clearance? MESG(mm)
Minimum ignition current ratio? MICR
IIAMESG≥0.9MICR>0.8
IIB0.9>MESG>0.50.8≥MICR≥0.45
IIC0.5≥MESG0.45>MICR
Gree's explosion-proof air conditioner
We are capable of dealing with customized service via fine grinding, maching, polishing according to clients' drawing, specification and practical samples.
Explosion-proof air-conditioning explosion-proof principle Explosion-proof temperature group and explosion-proof type
Greme's explosion-proof air conditioning signs are generally composed of the following five parts: 1 Explosion-proof air conditioning sign EX - indicates that the equipment is explosion-proof electrical equipment; 2 Explosion-proof air conditioning structure - shows what measures the equipment used for explosion protection, such as d is flameproof, p is positive pressure type; i is the safety type; 3 explosion-proof air conditioning equipment