Study on Lightning Protection of Vortex Street Flow Sensor
Frequently, companies have been installed with vortex flow sensors that have experienced lightning strikes that cause damage. Lightning is a common phenomenon in nature, so we have to find ways to eliminate its impact on flow sensors . First of all, let's find out what the impact of lightning on the sensor is: First, lightning strikes the sensor through the power supply. Second, the lightning generated at the same time with the strong magnetic field instrumentation electronic components generate magnetic induction, and instantly generate a strong voltage and current, breakdown insulation burn sensor. Third, lightning pulse waves invade a flow sensor through a wireless network and burn out a communication chip or sensor. According to the on-site environment, lightning protection should not adopt a general lightning protection scheme. Common lightning protection schemes include: 1, external lightning protection. Including lightning rods, lightning protection strips, deflectors, grounding electrodes, etc. 2. Internal lightning protection. Install suitable lightning protectors at the front end of the equipment to be protected, so that the equipment and the circuit form a conditional equipotential body with the ground. The two lightning protection schemes complement each other. The external lightning protection system protects the building body from lightning strikes, while the internal lightning protection is to prevent induction lightning and other forms of overvoltage from invading the device and causing damage. If the flow sensor is damaged, it is best to check whether the lightning rod is installed first. If so, check whether the grounding resistance is qualified at the testing point; if the flow sensor is connected with the pipeline flange, check whether the grounding screw of the internal amplification board is Connected, the shell can be used alone as a bottom line copper wire to connect to the pipe flange bolt, and then the cable into the line, the outer protection tube and the end of the connecting metal hose must be screwed into the hole into the hole; In addition, a surge protector can be added to the front end. It is also necessary to explain that it is not time for the sensor to consider lightning protection measures and the work is over. Before the annual thunderstorm season, it is also necessary to regularly check the installed vortex flow sensor. If it is found that there is a great change in the value of the grounding resistance, the grounding system should be fully inspected, and if necessary, the grounding pile can be supplemented. If the conductor of each part of the lightning protection device is broken or rusted by more than 30% due to corrosion or other reasons, it must be replaced. In addition, check whether there is any subsidence of soil around the grounding device. The lightning protection of the sensor is a system work. It cannot be omitted for a moment. Many of the damage caused by lightning to the flow sensor is permanent and unrecoverable, which directly affects the safe operation of production. This has a particularly significant effect on the manufacturers of continuous production.
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