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

	Safety Mat Safety Relay	Safety mat relaymodules provide a high level of fail-safe operation for critical processes and protection. This safety mat and multi-function contr...
	DO Signal (SIS) Input 24V DC 5A Safety Relay	These safety relay are suitable for the application of E-Stop button, safety gate and DO signal from SIS, with several contacts output. The emer...
	20KA AC Power SPD	SPD for AC power; 220VAC, TN system, Single phase; In(8/20us): 10kA/phase, Imax: 20kA/phase; hot-pluggable; fault indication. Features & Adv...
	AC Power SPD	ACSPDType 2 The ac voltage protectorfor AC unit is designed to prevent transient surge conditions. Large single surge events, such as lightning, c...
	Antennas And Feeders SPD	Antennas feeders SPD, the coaxial lightning surge protectoror coax surge suppressor, is used in the antenna feeder circuit of the radio communicati...

供应产品

Same products

	CSD16301Q2 TRANSISTOR MOSFET N-CH 25V 6SON TEXAS INSTRUMENTS	卖方: ZK Electronic Technology Co., Limited	Part Number:CSD16301Q2 Description:CSD16301Q2 TRANSISTOR MOSFET N-CH 25V 6SON TEXAS INSTRUMENTS ...
	CAPACITOR EEF-CX0J10CAPACITOR EEF-CX0J101R PANASONIC SMD SPEC POLYMER 100UF 6.3V SMD LF1R PANASONIC SMD SPEC POLYMER 100UF 6.3V SMD LF	卖方: ZK Electronic Technology Co., Limited	Part name:EEF-CX0J101R Description:CAPACITOR EEF-CX0J101R PANASONIC SMD SPEC POLYMER 100UF 6.3V ...
	Heavy Copper PCB Manufacturer	卖方: Xinfeng Huihe Circuits Co., Ltd.	Heavy Copper PCB, pcb fabrication up to 12oz, large current, pcb circuitfabrication base material...
	8 Layer ENIG Half Hole Custom PCB	卖方: Xinfeng Huihe Circuits Co., Ltd.	Number of layers: 8 Surface finish: ENIG Base material: FR4 Outer Layer W/S: 4/3mil Inner lay...
	4 Layer ENIG Impedance Control Half Hole PCB Electric Circuit Board	卖方: Xinfeng Huihe Circuits Co., Ltd.	Number of layers: 4 Surface finish: ENIG Base material: FR4 Outer Layer W/S: 6/4mil Inner lay...