What is the working principle of the anti explosion sensor

For the use of sensors in flammable and explosive occasions, in order to avoid the occurrence of explosion, usually with explosion-proof requirements of the product. There are three main sensor explosion-proof methods, respectively, is to control the explosive gas explosion detonated, control limitations and control source. The working principle of the three methods do briefly introduce: 1, control and explosive gasThe working principle is the box body burst in a sealed compartment, with clean air or inert gas does not contain explosive gases, and keep the inside pressure is slightly higher than the tank pressure, the sensor is installed in the box. Representative for the positive pressure explosion-proof method Exp. 2, control the explosion limitThe working principle is according to Exd standard, Crank Position Sensors housing design for flameproof standard housing, according to the shell explosion-proof standard instrument design, according to the standard design, manufacture and assembly of severely all management process, in the attack the shell explosion not to excite the shell of gas explosion risk.
Isolation design and manufacture standard proof explosion-proof measures extremely severe, and operating procedures, and repair of the assembly connection is also very strict. Electrical equipment, the way of determining the flameproof instrument are very strict, the operation must be off, but many cases is the most useful method. 3, ignition control source principle is applied safety gate isolation wiring, processing from Cooling Temp Sensor is in electric power distribution, will supply the field sensor energy limited in both cannot occur enough to detonate the spark, and can safely confined to surface temperature rise within the instrument. According to the national standards of international norms and China, when the peace gate safe area at one side of the connecting device to attack any obstacle, essence safety explosion-proof measures to ensure that explosion risk on site safety need to remind you to consider in the purchase of Cooling Temperature Sensor for the use of different occasions and configuration, choose according to need the intrinsically safe type, flameproof type sensors and instrumentation also required, Ex explosion-proof certification from suppliers.