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technical article
Main Features of Isolated Safety Barrier
2012-1-6 9:39:56

制造的专业厂家,多年来为满足市场需求,不断实践,总结经验并对产品进行改进。 Dongxiang Instrument Co., Ltd. is a professional manufacturer engaged in the design and manufacture of safety barriers and isolators for a long time. In order to meet market needs, it has continuously practiced, summarized experience and improved products. New Isolators and Barriers in Performance and Technology

The indicators have been improved in the past.

The current market requirements for products are mainly summarized as follows:

1. Modular design method to solve the problem of large variety and small quantity;

The isolator and safety barrier are generally composed of an input signal processing unit, an isolation unit, an output signal processing unit, and a power supply system. Add an intrinsically safe design to the input or output unit according to the flow of the signal to form an isolated safety barrier.


2.Low power design

Low power consumption is the constant pursuit of electronic product design. With the development of technology, the power consumption of safety barriers and isolators has been greatly reduced compared to the past, and performance and technical indicators have also been improved.

3. Miniaturization and less wiring to meet high-density installation requirements;

4. Intelligent way to improve performance and increase the digital transmission channel of signals


5. Provide data collection function.

In addition to selecting an appropriate safety barrier, the intrinsic safety system should pay attention to the following aspects when using it:


First, pay attention to the capacitive and inductive reactance of cables and field equipment. Intrinsically safe explosion protection is the explosion protection of the system. In addition to the safety barrier required to achieve the required explosion-proof level, energy storage of cables and field equipment is also a key issue. especially in

After the parametric certification replaces the system certification, the engineer should pay special attention to this issue.


Second, pay attention to intrinsically safe grounding. Zener barriers need intrinsically safe grounding. The grounding resistance should be less than 1.


Third, intrinsically safe cables and non-intrinsically safe cables should be laid separately in different trunkings. It should be clearly marked.


Fourth, pay attention to power failure when replacing.

应用优点 Application advantages of isolated barriers


① Compared with Zener barriers, although the price is higher, isolated barriers have many advantages and features that bring many conveniences to users, and more and more users prefer to choose isolated barriers.


② The use of an isolated safety barrier can effectively isolate the on-site circuit signals in the danger zone from the safety zone circuit signals. In this way, the intrinsically safe automatic control system does not require an intrinsically safe grounding system, which simplifies the construction when the intrinsically safe explosion-proof system is applied.


③ The use of an isolated safety barrier greatly enhances the anti-interference ability of the detection and control circuits and improves the system reliability.


④ Use an isolated safety barrier to allow field instruments to be grounded and allow field instruments to be non-isolated.


⑤ The isolated safety barrier has many protective function circuits, and the possibility of accidental damage is small. It allows the field instrument to be repaired with power on, which can shorten the project preparation time and stop time.


有较强的信号处理能力。 ⑥Isolated safety barrier has strong signal processing ability. Such as switching value input state control, mV, Pt100 becomes 4 ~ 20mA and so on. This provides greater convenience, rationality and effectiveness for the application of field instruments and control systems.


用户 When the user applies DCS and ESD at the same time, the one-in two-out safety barrier can be used to effectively isolate the two systems and avoid mutual influence between the systems.


供电 The loop-powered isolated safety barrier not only maintains the advantages of an active isolated safety barrier, but also has the same wiring as a Zener safety barrier, and does not require another 24V power supply. It is especially suitable for DCS systems that are directly powered by I / O cards.