Because load cells are widely used in various environments, load cells are often used outdoors, especially large scales such as digital truck scales and track scales. The weight sensor housings are usually made of metal, which is generated by lightning overvoltage. The spikes invade the connection between the sensor and the instrument, so that the voltage amplitude of the connection is much higher than the working voltage of the instrument and the instrumentation burns out, which makes the weighing system unable to work normally, causing huge damage to the enterprise. Economic loss. It can be seen that lightning protection for digital sensor instrumentation interface circuits is becoming more and more important. Therefore, how the load cell is lightning protection becomes very important.
The lightning protection of the instrumentation interface circuit is becoming more and more important. The digital sensor has the advantages of high reliability, anti-cheating, strong anti-interference ability and long signal transmission distance, and is welcomed by more and more users. Digital sensor instrumentation lightning strike protection measures According to experience, the instrument will be tested for lightning strikes. One end of the lightning strike generator is connected to the digital sensor housing, and the sensor and the instrument housing are reliably connected by a shielded cable, and the instrument housing is connected to the other end of the generator through a series sampling resistor. For a certain overvoltage or overcurrent shock pulse, after the first level of protection, there will still be residual voltage flowing to the subsequent circuit. If the subsequent circuit can not withstand the impact of residual voltage, it will also damage the core circuit, so take multi-level protection measures for the instrumentation interface circuit.
When installing the load cell, we must consider whether it will receive the impact of lightning strikes. Lightning strikes will not only cause damage to the instrument that has been attached to the sensor, but also introduce the wires of the channel sensor into other places, causing damage to property and even casualties. Therefore, we must consider the lightning protection measures when installing the load cell, especially when installing the load cell outdoors.
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