Intrinsic safety and flameproof introduction of gas detector

Intrinsically safe and explosion-proof control cabinets are usually installed in safe areas. Flameproof type and intrinsically safe type are two kinds of explosion-proof electrical appliances. The former may have a source of explosion (such as a light bulb), but the explosion-proof measures are used for safety purposes. The latter will not achieve deflagration energy (voltage is not higher than 12 V). Current less than 100mA, such as thermal resistance, is intrinsically safe. In spite of this, explosion-proof electrical appliances usually have safety barriers installed at the boundary between safety and non-safety applications. Pressure transmitters can also have the above two differences based on different operating principles. Explosion-proof grades are selected according to use

Intrinsically safe explosion-proof technology usually adopts PLC control system. The cabinet is equipped with a safety barrier, and the signal line returned from the danger zone is processed through the safety barrier before being connected to the PLC input/output module. Currently, intrinsically safe explosion-proof technology is commonly used for PLC input signals, and the input current in hazardous areas can be limited to 2 mA or less. Because the current is very small, it is essentially safe. The PLC output signal usually uses explosion-proof explosion-proof technology because of price and other factors. The output signal line is usually armored cable, penetrates the water gas pipe, and is connected with explosion-proof explosion-proof electrical equipment, such as explosion-proof motor, etc. The installation requires control. Cabinets must be sealed to the final equipment to isolate the cables from the hazardous area.