Overview and Working Principle of Isolation Safety Barrier for Gate Opening Analysis
Date: 2016-01-12Read: 5
What do isolation barriers and intrinsic safety barriers do? The simplest answer is to limit energy and voltage, which is to prevent dangerous signals of high current or high voltage from entering the hazardous site (the most widely used is in the petrochemical industry)
For example, in the petroleum industry, there are flammable and explosive substances on site. The safe current on site is 20mA. If the current suddenly increases by more than 20mA at a certain time, these safety barriers will come into effect.
Application Overview:
Industrial sites generally require the use of two-wire transmission power distribution devices, which not only provide 24V distribution power for primary instruments such as pressure transmitters, but also collect, amplify, calculate, and perform anti-interference processing on the input current signals before outputting isolated current and voltage signals for use by subsequent secondary instruments or other instruments.
But some special industrial sites not only require two-wire transmission, providing both distribution power and signal isolation functions, but also need to have safety spark type explosion-proof performance to reliably prevent mixed contact between high voltage and signals of the power supply. By using current and voltage dual limiting circuits, the energy entering hazardous areas is limited to below the safety quota with special functions of distribution devices - safety barriers.
Isolated safety barrierThere are basically two types of safety barriers: detection end safety barriers and operation end safety barriers. The detection end safety barrier is used in conjunction with a two-wire transmitter; The safety barrier at the operating end is used in conjunction with electrical converters or valves. There are also signal input and other types of isolated safety barriers.
due toIsolated safety barrierBy adopting measures such as voltage limiting, current limiting, and isolation, not only can hazardous energy be prevented from entering the hazardous site through intrinsic safety terminals, improving the intrinsic safety explosion-proof performance of the system, but also the anti-interference ability of the system is increased, greatly improving the reliability of system operation.
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