How to use the isolation barrier safely?


Release time:

2022-05-30

How to use the isolation barrier safely? The isolation safety barrier transmits the voltage and current signals from the dangerous area to the safety area through isolation and conversion, outputs unidirectional or independent bidirectional current/voltage signals to the safety area, and can also carry out serial communication networking in the safety area through the configured communication interface. It is an intelligent safety barrier product, users can set the input signal type and output range of the product through a special programmer or computer.

How to use the isolation barrier safely?

The isolation safety barrier transmits the voltage and current signals from the dangerous area to the safety area through isolation and conversion, outputs unidirectional or independent bidirectional current/voltage signals to the safety area, and can also carry out serial communication networking in the safety area through the configured communication interface. It is an intelligent safety barrier product, users can set the input signal type and output range of the product through a special programmer or computer.

In terms of reliability, the isolation barrier uses three isolation technologies: input, output and power supply. All signal terminals are protected by voltage limiting, current limiting and anti-surge circuits. The combination of electromagnetic isolation and photoelectric isolation ensures the physical isolation of intrinsically safe and non-intrinsically safe terminals and enhances the reliability of the product. In terms of signal processing, the safety barrier of Mingtai detection terminal abandons the traditional method of converting analog signals into frequency signals and then transmitting signals through photoelectric coupling, and adopts modulation and demodulation technology, which greatly improves the accuracy, temperature drift and anti-interference ability of the product. The following are several aspects that should be paid attention to when using the safety barrier correctly:

1. In order to ensure the normal operation of the system, it is necessary to determine the parameters of the safety barrier according to the system parameters. The safety barrier mainly depends on the working voltage, large working voltage, terminal resistance and other parameters, while the isolation safety barrier mainly depends on the achievable accuracy. Of course, regardless of the safety barrier or the isolation barrier, the working environment must be considered, such as the use of temperature, humidity, and whether the installation method is convenient for on-site installation.

2. It is necessary to determine the explosion-proof level according to whether the explosion-proof area is zone 0, zone 1 or zone 2. After that, it can be determined whether to use ia or ib safety barrier;

3. The installation location must have a very reliable grounding system, and the grounding resistance of the safety barrier must be less than 1, otherwise the explosion-proof safety protection performance will be lost. Obviously, this requirement is very demanding and difficult to guarantee in practical engineering applications;

4. It is required that the field instruments from the dangerous area must be isolated, otherwise the signal cannot be transmitted correctly after being grounded through the grounding terminal of the safety barrier, and the signal grounding will directly reduce the anti-interference ability of the signal and affect the stability of the system;

5. The isolation safety barrier has a great influence on the power supply, and it is also easy to damage the safety barrier due to the fluctuation of power supply;

Because the circuit principle of the safety barrier needs to absorb the energy of the input circuit, it is easy to cause the output to be unstable.