Which instruments can use intrinsically safe types? Which ones can only be flameproofed? What is the function of a safety barrier?
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Which instruments can use intrinsically safe types? Which ones can only be flameproofed? What is the function of a safety barrier?
The function of a safety barrier is to limit energy.
In hazardous environments, where intrinsically safe meters are not available, flameproof meters are used. Zone 0 can only use intrinsically safe instruments. Zone 1 and Zone 2: intrinsically safe meters as well as explosion-proof meters can both be used. Whatever you use for the ball works.
So, which instruments come in intrinsically safe versions? ? Such as flow meters, level gauges, pressure transmitters, thermometers, etc
All of the instruments you mentioned come in intrinsically safe versions. Intrinsic safety is an option in their selection code. Find a few selection guides, go through each item on the selection page, and you’ll understand it. .
A safety barrier, also known as a safety energy limiter, is an important component in intrinsically safe systems. Safety barriers are mainly divided into two categories: Zener safety barriers and isolated safety barriers. The core components of a Zener-type safety barrier are Zener diodes, current-limiting resistors, and fast fuses. An isolated safety barrier not only has a function of limiting power but also provides isolation; it is primarily composed of a circuit power-limiting unit, a signal and power isolation unit, and a signal processing unit. The main function of the safety barrier is to limit current and voltage, ensuring that the energy available to the field instruments remains within safe limits.