Intrinsic Safety Barriers
Tips & Advice to help you make your decision on Intrinsic Safety Barriers
Intrinsic safety barriers are used to protect workers who are involved with electronics in irregular conditions resulting from explosions and other accidents. The barriers are used to ensure the safe operation of the equipment.
Hazardous areas, such as gas platforms in the North Sea, can cause explosions from electrical sparks due to the amount of electrical or thermal energy. These areas are more likely to ignite from the normal sparks produced by electrical equipment such as two-way radios. Short-circuiting electronics can also heat rapidly, rising to dangerous temperatures. Intrinsic safety barriers are often used in areas where the air may become a combustible atmosphere.
Two types of barriers are commonly used, the Zener safety barrier and the galvanic isolation barrier. A Zener barrier, or Zener diode, is used as a shunt regulator inside small circuits. This helps keep the voltage of devices from rising above a safe level.
The galvanic isolation barrier works by forming a barrier around the functional sections of an electrical system. This prevents surges from moving from one area of the device to another, making it impossible for direct current to pass through the object.
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Intrinsic Safety Barriers
Buy an intrinsic safety barrier to ensure safe operations in hazardous environmentsBy Howard Robertson An intrinsic safety barrier (IS barrier) is an integral part of an intrinsic safety system that prevents fire and explosions in hazardous areas with flammable or explosive chemicals and gases.
The two types of intrinsic safety barriers (or intrinsic barriers) are galvanic isolators and zener barriers. To adhere to safety conditions, zener barriers limit excess voltage and current for the circuit. On the other hand, galvanic isolators isolate the circuit and prevent the unwanted current or voltage from passing through other connected components. Some of the devices that use intrinsic safety barriers are flow meters, current-to-pressure converters and proximity switches.
Some important parameters you must consider before purchasing intrinsic safety barriers are:
- Maximum voltage and current for the circuit
- Performance specifications for the safety barrier: operating temperature and number of input and output channels
- Type of current: AC or DC
Buy a safety barrier from intrinsic barrier manufacturers
Once you understand your requirements, research different intrinsic safety barriers from the manufacturers to find the most suitable safety barrier.
Try:
Exloc Instruments is an intrinsic barrier manufacturer that offers galvanic isolator IS barriers for a range of circuit currents. Pepperl+Fuchs designs and manufactures automation products including intrinsic safety barriers. Motor Protection Electronics, another intrinsic barrier supplier, offers intrinsic safety relays and pump controllers for water and wastewater applications. Leuze electronic provides safety relays for automobile finishing operations. You can also buy intrinsic safety barriers at Ronan and AMETEK.
Buy a safety barrier from intrinsic barrier distributors or retailers
You can compare different safety barriers, their specifications and prices at distributors' or retailers' websites before buying an intrinsic safety barrier.
Try:
You can buy intrinsic safety barriers online at TriStar Electronics. You can also browse through the list of intrinsic barrier suppliers at ThomasNet and GlobalSpec.
Buy a specialty or customized intrinsic safety barrier
An intrinsic safety barrier must meet all the requirements for your automation system setup. You can select a customized intrinsic safety barrier if standard products available in the market do not match your requirements.
Try:
Siemens is a reputable intrinsic barrier supplier that also offers specially engineered zener shunt-diode barrier for equipments installed in hazardous areas. Phoenix Contact is another intrinsic barrier manufacturer that customizes modular safety barriers for equipments in explosive surroundings. Rockwell Automation, a manufacturer of automation products, provides standard as well as customized intrinsic safety barriers under the brand Allen-Bradley. You can order customized safety barriers at Rice Lake, another intrinsic barrier supplier.
- Install an intrinsic barrier in a dust and moisture-free enclosure.
- As zener safety barriers ground the unwanted current and voltage, ensure isolated grounding when you use them.
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