Six aspects that must be understood in the safe use of safety barriers

The safety barrier will send the voltage and current signals from the dangerous area to the safety area through isolation and transmission into single or independent dual current/voltage signals, 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 this product through a special programmer or computer.
Safety barrierIn terms of reliability, three isolation technologies of input, output and power supply are adopted. Protection circuits such as voltage limiting, current limiting and surge prevention are adopted for all signal terminals. The combination of electromagnetic isolation and photoelectric isolation is adopted to ensure the physical interval between the safety and non-safety terminals and enhance the reliability of the product.

NANJING PARROKEN TECHNOLOGY CO., LTDIn terms of signal processing,Safety barrier at inspection end,Operating end safety barrier,Thermal resistance isolation safety barrier,Thermocouple Isolation Safety Barrier,These products have abandoned the traditional analog signal into a frequency signal, and then through the photoelectric coupling to transmit the signal method, and the use of modulation and demodulation technology, making the product accuracy, temperature drift, anti-interference ability has been greatly improved.

The following is the correct use of the safety barrier need to pay attention to several aspects:
1. To ensure the normal operation of the system, it is necessary to determine the parameters of the safety barrier according to the parameters of the system. The Zener safety barrier mainly depends on the working voltage, the maximum working voltage, the terminal resistance and other parameters.Isolation safety barrierMainly look at the accuracy that can be achieved. Of course, no matter the Zener safety barrier or the isolation safety barrier, the working environment should be considered, such as the use of temperature, humidity, and whether the installation method is convenient for on-site installation, etc;
2. The explosion-proof level to be reached shall be determined according to the area to be explosion-proof, whether it is zone 0, zone 1 or zone 2. Finally, it can be determined whether to use Ia or Ib safety barrier;
3, the installation position must have a very reliable grounding system, and the grounding resistance of the safety barrier must be less than 1Ω, otherwise it will lose the explosion-proof safety protection performance, obviously this requirement is very harsh, and it is difficult to guarantee in the actual engineering application;
4. The field instrument from the dangerous area must be isolated, otherwise the signal will not be transmitted correctly after the grounding terminal of the safety barrier is connected to the earth, and the signal grounding will directly reduce the anti-interference ability of the signal and affect the stability of the system;
5. The safety barrier has a great influence on the power supply, and it is also easy to cause damage to the safety barrier due to the fluctuation of the 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.
The above is about the correct use of the safety barrier need to pay attention to 6 small aspects.

The main principle of the most widely used Zener safety barrier is to use fast fuse, current limiting resistor or voltage limiting diode in the circuit to limit the input electric energy, so as to ensure the energy output to the dangerous area. Its principle is simple, the circuit is easy to implement, and the price is low, but because of the defects of its own principle, the reliability of its application is greatly affected, and its application range is limited.

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