The previous article took you to know some simple knowledge of explosion-proof cameras. This article will introduce the classification and explosion-proof grade of explosion-proof camera for friends who are ready to buy Deli innovative explosion-proof camera. Let's have a look.

1. What are the categories of explosion-proof cameras?

A: 1. Class I mineral methane. — For use in coal mines (mine explosion-proof) : intrinsically safe, its explosion-proof mark is exibⅠ; Flameproof type, its explosion-proof mark is exdⅠ.

Ii. Class II explosive mixed gases. — In chemical industry, oil field, oil tank, petrochemical, oil refining, military, aerospace and other factories (gas explosion-proof) : commonly used flameproof type, its explosion-proof mark is exdⅡa, Ⅱb, Ⅱc.

Class III Explosive dusts and fibers — — In grain processing plants, grain depots and other dust environment: generally use dust explosion-proof electrical equipment, the explosion-proof mark is exdip.dt.t13.

2. What is explosion-proof rating?

A: The classification of explosion-proof grades is divided according to the category used by the equipment, the temperature group of the explosive gas mixture, and the explosion-proof type of the explosion-proof electrical equipment.

Explosion-proof electrical equipment is divided into two categories: I for coal mine underground electrical equipment; II is electrical equipment used in places other than mines, according to the maximum test safety gap (MESG) or minimum ignition current (MICR) to distinguish, Class II electrical equipment is divided into: IIA, IIB, IIC three categories.

3, explosion-proof camera production materials

A: Explosion-proof cameras are generally changed with Canon, Fuji, Panasonic prototype cameras.

4. What are the common explosion-proof types?

The main explosion-proof types are:

Flameproof type Ex d

Intrinsically safe Ex ia Ex ib

Special type Ex s

Enhanced safety EX e

Positive pressure type EX p

Cast type EX m

5, what is flameproof explosion-proof? What is the difference between flameproof and intrinsic safety?

A: Intrinsically safe explosion-proof cameras are characterized by intrinsically safe processing of camera circuits, but the biggest disadvantage is that the unit cost is too high, in addition, it is not conducive to future upgrades. Positive pressure type is the common structure of early American explosion-proof camera products, the use of maintenance is quite inconvenient, if not carefully maintained, the explosion risk is quite large. Basically has been completely eliminated by the explosion-proof camera industry.

Intrinsic safety type features: small and light, friendly and convenient operation interface, dangerous areas can be opened for maintenance, the need for intrinsic safety power supply.

6. What is the level of protection?

The protection rating system was drafted by the IEC. Electrical appliances are classified according to their dustproof and waterproof characteristics. The foreign objects referred to here include tools, and human fingers are not allowed to touch the live part of the electrical appliance to avoid electric shock. The IP protection level is composed of two numbers, the first number indicates the level of dust prevention and foreign object intrusion prevention, the second number indicates the degree of tightness of waterproof intrusion, the larger the number indicates the higher the level of protection.

7, temperature group, why T6 is the highest grade of gas flameproof?

The temperature group of explosive gas environment is divided into six groups from T1 to T6, and the temperature of each group is T1. 450 ° C, T2— 300 ° C, T3— 200 ° C, T4— 135 ° C, T5 ° C; 100℃, T6— 85 ° C.

According to the "Explosion and fire hazard environment electrical equipment design Code", of course, T6 is the safest. T6 level, the lowest ignition temperature, such appliances, low ignition point of combustible gas can also effectively prevent explosion, high ignition point of combustible gas, of course, there is no problem.

8, anti-dust ignition flameproof

Dust prevention mainly refers to the prevention of combustible dust explosion, such as cotton spinning processing, flour mills, gunpowder production.