The difference between intrinsic safety explosion-proof and explosion-proof

The difference between intrinsic safety explosion-proof and explosion-proof

When choosing explosion-proof instruments, most merchants will ask whether to choose intrinsic safety explosion-proof instruments or explosion-proof instruments. Both of these instruments are used in hazardous areas, what are the differences between them?
Firstly, we need to know the definitions and characteristics of these two types of instruments:
Intrinsic safety explosion-proof instrument: Intrinsic safety type instrument, also known as safety spark type instrument, is characterized by the fact that the sparks and high temperatures generated by the circuit or system will not ignite explosive objects or gases, regardless of whether the instrument is in normal or faulty state.
The explosion-proof performance of intrinsic safety instruments is not achieved through external measures such as ventilation, inflation, oil filling, and explosion-proof, but through the circuit itself, and therefore is intrinsic safety.

Explosion proof instrument: Explosion proof instrument is a type of instrument in which all circuits and wiring terminals of the instrument are placed in an explosion-proof box. The explosion-proof box shell is strong enough, and the joint surface gap is deep enough, with a large gap width that is narrow enough. So even if sparks are generated due to circuit or system faults in the instrument, it will not cause external flammable substances or gases to explode. The explosion-proof box can withstand the pressure generated by the explosion of the internal mixed gas, and prevent the internal explosion flame and high-temperature gas from bursting out of the explosion-proof gap and igniting the explosive mixture around the shell.
This is the definition and characteristics of intrinsic safety instruments and explosion-proof instruments. The specific differences between these two instruments are as follows:
1. By definition: Explosion isolation can produce an explosion, but by isolating the energy of the explosion inside the chamber, it cannot cause an explosion outside the shell. Explosion proof is to prevent the occurrence of explosions, and explosion-proof and intrinsic safety are two ways to prevent explosions. Intrinsic safety type does not produce explosions, and any electrical sparks or thermal effects generated under standard conditions (including normal operation and specified fault conditions) cannot ignite circuits in explosive gas environments (0/I zone explosion-proof technology).
2. In principle, explosion-proof requirements require that the shell must have sufficient strength; And each shell joint surface must have a sufficiently long engagement length and a sufficiently small gap to ensure that internal explosions do not pass through the explosion-proof joint surface and cause external environmental explosions. Intrinsic safety is a "safety" technology that uses the suppression of ignition source energy as an explosion-proof measure. Require that the electrical sparks or thermal effects that may be generated by the equipment during normal operation or malfunction are less than the minimum ignition energy and self ignition temperature of explosive hazardous gases, respectively.
3. In terms of application scenarios: Explosion proof type is only suitable for installation in Zone 1 or Zone 2 hazardous areas.
Application area of intrinsic safety type:
(1) Ruijia ia: Equipment that can maintain explosion-proof performance even after two components or other types of failures. Intrinsic safety equipment can be installed in hazardous areas of Zone 0, Zone 1, and Zone 2. Ex ia intrinsic safety equipment is the only explosion-proof electrical equipment that can be installed in Zone 0.
(2) Ruijia ib: Equipment that can maintain explosion-proof performance even after a component or other type of failure. Intrinsic safety equipment can be installed in Zone 1 and Zone 2 hazardous areas.
The above is the difference between intrinsic safety instruments and explosion-proof instruments. When choosing, we should choose the one that is more suitable for ourselves, rather than choosing the cheaper one to save money. Explosion prevention is of utmost importance in hazardous industries, and all production must be based on safety as a prerequisite.