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How to install and maintain the isolation barrier?

Release time:

2022-05-12

How to install and maintain the isolation barrier? In demanding engineering sites, the isolation barrier is almost without exception used as the main intrinsically safe explosion-proof instrument. The isolated safety barrier has gradually replaced the Zener safety barrier and has been widely used in the field of safety and explosion protection. Regardless of the role of the safety barrier, I hope everyone can use it after knowing it, so that the safety barrier in Chengdu can play a big role.

How to install and maintain the isolation barrier?

In demanding engineering sites, the isolation barrier is almost without exception used as the main intrinsically safe explosion-proof instrument. The isolated safety barrier has gradually replaced the Zener safety barrier and has been widely used in the field of safety and explosion protection. Regardless of the role of the safety barrier, I hope everyone can use it after knowing it, so that the safety barrier in Chengdu can play a big role.

The isolated safety barrier has outstanding advantages and wider applications. Considering the cost of design, construction, installation, commissioning and maintenance, the overall cost is low. Isolated safety barriers are almost invariably used as the main intrinsically safe explosion-proof instrument in demanding engineering sites, and have been widely used in the field of safety and explosion-proof.

The application of safety barriers and the concept of intrinsically safe explosion-proof have been deeply applied in dangerous industries such as chemical industry, and have been widely used. Chemical instrument personnel must master its basic principles and use methods to ensure the intrinsic safety of on-site production.

Function of isolation safety barrier:

1. Due to the adoption of the three-party isolation method, the system grounding wire is not required, which brings great convenience to the design and on-site construction.

2. The requirements for instruments in hazardous areas are greatly reduced, and isolation instruments are not required on site.

Since the signal lines do not need to share the ground wire, the stability and anti-interference ability of the detection and control loop signals are greatly enhanced, thereby improving the reliability of the entire system.

4. The isolation barrier has a stronger input signal processing capability, which can receive and process thermocouple, thermal resistance, frequency and other signals.

5. The isolation safety barrier can output two mutually isolated signals for two devices using the same signal source, ensuring that the signals of the two devices do not interfere with each other, and improving the electrical safety and insulation performance of the connected devices.

Precautions for installing the isolation barrier:

1. The isolation barrier should be installed in a safe place, and the environmental conditions should meet the requirements of "use conditions" in "safety barrier selection sample.

2. The connection lines of the intrinsically safe end (blue end) and non-intrinsically safe end circuits of the isolation barrier shall be laid separately in the trunking, and each adopts independent protective sleeve. No other power cords are allowed in the wiring ducts on this side, including those used by their intrinsically safe circuits.

3. Intrinsically safe wires with blue signs shall be used for wires leading to hazardous locations. The soft copper area of the wire must be greater than 0.5 mm2, and the insulation strength should be greater than 500V.

4. Before the power-on commissioning of the isolated safety barrier, it is necessary to pay attention to whether the model, connection mode and line polarity of the isolated safety barrier meet the requirements in the design and product requirements, otherwise it may cause harm to people and equipment.

5. It is forbidden to use a megohmmeter to test the insulation strength between the terminals of the isolation safety barrier. If you want to check the insulation strength of the system, you should first disconnect all isolated safety barriers, otherwise the internal circuit of the safety barrier may be damaged. 6. Before programming the safety barrier on site, you must disconnect all wiring, then connect the programmer, and then power on for programming, otherwise it may cause adverse consequences.

7. The field instrument connected with the isolation safety barrier shall be the instrument that has passed the explosion-proof inspection of the relevant explosion-proof inspection department recognized by the state and obtained the explosion-proof certificate.

8. In the design, installation, use and maintenance of the isolation barrier, should also comply with the relevant requirements.

The isolation safety barrier is a device used in the intrinsically safe explosion-proof system, which plays a role of safety isolation for field instruments. For explosion-proof systems and explosion-proof electrical equipment, intrinsically safe explosion-proof systems are designed with intrinsically safe barriers. They are installed in a safe place and contain intrinsically safe circuits and non-intrinsically safe circuits. In the circuit, the energy sent to the field intrinsically safe circuit is limited by the current limit and voltage limit circuit, thereby preventing dangerous energy from the non-intrinsically safe circuit from entering the intrinsically safe circuit. They are called associated equipment in intrinsically safe explosion-proof systems and are an important part of intrinsically safe systems.

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