The Principle and Classification of Safety Barriers

China safety barrier is generally used in intrinsic safety systems. Intrinsic safety refers to system explosion-proof technology, which refers to the function of making production equipment or production system itself safe through design and other means, and will not cause accidents even in the case of misoperation or failure. The safety barrier is a commonly used associated equipment in intrinsic safety explosion-proof systems. The safety barrier (such as GS8500-EX and GS8597-EX.3 safety barrier from Chenzhu)is a circuit between the field equipment and the control room that limits energy.

2. intrinsic safety barrier

To enable intrinsic safety equipment in hazardous locations to work normally, and to limit the electrical energy supplied to field instruments from the control room to a range that can neither generate sparks which are sufficient to detonate dangerous gases nor enable instrument surface temperature to be high enough to detonate dangerous gases.

As long as the current-limiting and voltage-limiting circuit of the intrinsic barrier is working properly, it will not generate any sparks or cause surface temperature to be high enough to ignite an explosive environment. Therefore, whether the control room equipment in the safe place or the intrinsic safety equipment in the dangerous place fails, the entire system will be in an essentially safe state on the circuit and will not cause an explosion.

Since the intrinsic safety barrier is designed as an energy-limiting interface between the field equipment and the control room equipment, no matter whether the control room equipment is in a normal or faulty state, the safety barrier can ensure that the energy transmitted to the field equipment through it is intrinsically safe.

Intrinsic safety barrier, as the associated equipment between the non-intrinsic safety equipment in the control room and the intrinsic safety equipment in hazardous locations, is an important part of the intrinsic safety explosion-proof system. According to the structure, it is divided into two types: Zener safety barrier and isolation safety barrier.

(1) Zener safety barrier. In the circuit, the fast fuses, current limiting resistors and parallel voltage limiting Zener diodes are connected in series to realize the energy limitation, and to ensure that the energy is safely limited when the signals of instrument in dangerous area and the instrument in safe area are connected. It uses very few components, with advantages of small size, and low price, but there are also some fatal flaws, which greatly restrict its scope of application.

(2) Isolated barrier. A circuit structure that electrically isolates the input, output, and power supply from each other is adopted. Like digital input barrier, it has both the energy limiting function and the isolation function, and at the same time it meets the requirements of intrinsic safety energy limiting. Isolated intrinsic barriers are mainly composed of loop energy limiting units, signal and power isolation units, and signal processing units. Its outstanding performance advantages have brought great benefits to users in applications.

Isolated barriers have outstanding advantages and a wider range of uses. Although the price is slightly higher than the Zener safety barrier, considering the design, construction, installation, commissioning and maintenance costs, the overall cost may be lower than that of the Zener safety barrier.

If you want to know more about intrinsic safe barrier how it works, please visit our website.

Other supplier products

	Temperature Transmitter	CHENZHU, a reliable temperature transmitter manufacturer, provides a large range of head-mounted temperature transmitters at an affordable price. T...
	CZWB Series Temperature Transmitter	The CZWB series is an intelligent digital temperature transmitterdesigned specifically for industrial complexity. Unlike the din rail mounted type,...
	Signal Conditioner	SHANGHAI CHENZHU INSTRUMENT CO., LTD., signal isolator suppliers, is a very established provider that specialises in automation and safety. We have...
	Light Curtain Safety Relay	Light Curtain Safety Relay Light curtain Safety Relaysupports PNP-type light beam devices. Safety relay modules provide a high level of fail-safe ...
	Antennas And Feeders SPD	Antennas And Feeders SPD Antennas feeders SPD, the coax lightning protectoror coax surge suppressor, is used in the antenna feeder circuit of the ...

供应产品

Same products

	High-purity silica nano powder	卖方: Hebei Guiyan Electronic Materials CO., Ltd	High-purity silica nano powder High-purity silica nanopowderis a nano-silica powder prepared via...
	High purity organic colloidal Silica	卖方: Hebei Guiyan Electronic Materials CO., Ltd	High purity organic colloidal Silica High-purity organic silica solis manufactured from high-pur...
	Ultra high purity Silica Sol	卖方: Hebei Guiyan Electronic Materials CO., Ltd	Ultra high purity Silica Sol Ultra-high purity silica solis manufactured from ultra-high purity ...
	Silicate Ester	卖方: Hebei Guiyan Electronic Materials CO., Ltd	Silicate Ester By directly reacting high-purity silicon powder with alcohols under the action of...
	Body-Worn Camera	卖方: Shenzhen Tianlong Century Technology Development CO., LTD	Body-Worn Camera The Body-Worn Camerais a portable audio and video recording device that enhance...