1. What is the main basis for explosion-proof safety barriers?

The intrinsic safety system is receiving increasing attention in China, and the safety barrier, as its main component, will also be recognized by people. So, what is the main way for safety barriers to prevent explosions? Controlling energy is the magic weapon for explosion-proof safety barriers. Whether it is a Zener safety barrier or an isolated safety barrier, they all meet the requirements of explosion-proof regulations by controlling energy. Zener safety barrier, from its name, we can know that the main component of a Zener full gate is a Zener transistor, also known as a voltage regulator diode.But a Zener diode can only control the voltage value, so what component controls the current that constitutes the second element of electrical energy? Resistors, which have a certain power bearing capacity, also serve as current limiting devices here, ensuring that the current transmitted to the hazardous area by the safety barrier is always controlled within an allowable range, thus achieving intrinsic safety. So, how does the isolation barrier control energy? The pulse transformer is the main component that isolates energy from the safety barrier. Only with it can the energy flowing into the danger zone be controlled.

2. What should I pay attention to when using safety barriers?

In addition to selecting appropriate safety barriers, the following aspects should also be noted when using intrinsic safety systems:

*Attention should be paid to the capacitance and inductance of cables and on-site equipment. Intrinsic safety explosion-proof refers to system explosion-proof. In addition to achieving the required explosion-proof level for safety barriers, the energy storage of cables and on-site equipment is also a key issue. Especially after parameter authentication replaces system authentication, engineering companies need to pay special attention to this issue.

Secondly, attention should be paid to intrinsic safety grounding. Zener safety barriers require intrinsic safety grounding.

Thirdly, intrinsic safety cables and non intrinsic safety cables should be laid separately in different cable trays and clearly labeled.

Fourthly, when replacing, attention should be paid to cutting off the power.

3. Should we use isolation barriers or Zener barriers?

Generally speaking, the selection of Zener safety barriers is relatively easy, not easily damaged, and there are relatively few structural changes required for the original system, with obvious advantages. The explosion-proof principle of a Zener safety barrier is to use a Zener diode to control the output voltage and a resistor to limit the output current. The circuit is relatively simple. During normal operation, the Zener safety barrier is equivalent to two resistors connected in series in a circuit, so there is no need to make any changes to the system structure. In addition, the Zener safety barrier will not affect the accuracy of the original signal due to the absence of signal conversion.

Isolation safety barrier uses high frequency as the fundamental wave to modulate and demodulate the signal. If the signal changes, the accuracy will be affected by the safety barrier circuit. The isolation safety barrier, due to its high-frequency oscillation circuit, will generate radio frequency interference, which is detrimental to the system, and the isolation safety barrier is also relatively easy to damage. However, the isolation safety barrier does not require intrinsic safety grounding, which is also its advantage over the Zener safety barrier.In terms of price, Zener safety barriers are also much cheaper than isolated ones, which requires the use of many safety barriers. The price advantage of Zener safety barriers is also clearly reflected.

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