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 manufacturersOnce you understand your requirements, research different intrinsic safety barriers from the manufacturers to find the most suitable safety barrier.
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 retailersYou can compare different safety barriers, their specifications and prices at distributors' or retailers' websites before buying an intrinsic safety barrier.
Buy a specialty or customized intrinsic safety barrierAn 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.
- 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.