Explosion-proof sensors are preferred in many applications where explosion-proof requirements are required, such as in the oil and gas industry, chemical and petrochemical industry, energy engineering, heavy industry, etc. Explosion-proof sensors have an important impact on the safety of the site. Explosion-proof sensors are divided into explosion-proof sensors and intrinsically safe sensors. Isolated sensor is the ability to ignite the explosive mixture of components enclosed in a shell, the shell can withstand the explosion of the internal explosive mixture of explosive pressure and prevent and the surrounding explosive mixture of electrical equipment. Intrinsically safe sensors referred to as intrinsically safe sensors, intrinsically safe sensors is the principle of normal operation or the specified fault conditions generated by the electrical spark and thermal effects can not ignite the specified explosive mixture of the circuit. Intrinsically safe sensor explosion-proof method is the use of safety gate technology will provide to the field instrumentation of the electrical energy is limited to neither produce enough to ignite the spark, but also can not produce enough to ignite the instrument surface temperature rise within the safety range, thereby eliminating the detonation source of explosion-proof method. Explosion-proof sensor use, the sensor shell must be effectively grounded, intrinsically safe sensors must be used with safety barriers.

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