How to prevent lightning strike for electronic truck scale? Thunder and lightning can cause strong changes in atmospheric electromagnetic field, which mainly includes three physical processes: first, electrostatic induction, that is, changes in atmospheric electrostatic field on the ground caused by lightning, which makes conductors near lightning receiving objects generate induced charges, forming a very high potential difference to the ground; 2、 Electromagnetic induction, that is, the current in the lightning channel changes with time, forms a changing electromagnetic field in its surrounding space, and generates induced voltage and eddy current on the conductive objects near the channel; 3、 Electromagnetic radiation is formed by the rapid change of current in the lightning channel. As the electronic truck scale is only resistant to low voltage, the above three physical processes caused by lightning are extremely destructive, especially electromagnetic induction. The more advanced the microelectronic equipment, the less power consumption and the more sensitive it is, the more destructive it will be. Therefore, the following work should be done well for the electronic truck scale to prevent lightning strikes:

1、 Lightning rod shall be set up above the scale body to neutralize the charge in the cloud cluster with tip discharge effect, so that the electronic truck scale will not be damaged by lightning strike. The height of the lightning rod can be determined according to the length of the electronic truck scale. The protection radius of the lightning rod is a circular area equal to its height.

2、 The whole scale platform shall be grounded. One or more grounding cables shall be used to connect the scale body to the grounding pile. The grounding pile shall be driven in the zero zone with constant potential and the grounding resistance shall be less than 4. Features of electronic weighbridge There is a spacious large current return channel between the platform and the grounding pile, so that when electrostatic induction occurs, electrons can be added from the ground to make the sum. The manufacturer of electronic weighbridge can quickly evacuate without damaging the electronic truck scale after the equipment generates high potential.

3、 Each sensor shall be grounded for protection. Therefore, a grounding wire shall be set at each sensor location, and a grounding pile shall be set between the sensor and the "ground". The grounding wire shall be reliably connected with the grounding pile or connected with the nearby grounding bolt. However, the anchor bolts must be connected to the reinforcement grounding grid in the foundation.

4、 The metal conduit through the signal cable must also be connected to the grounding grid.

5、 The shielding layer of the signal cable of the load cell shall be grounded. When the electronic truck scale is powered by the municipal power grid, there is a long space distance from the distribution room to the installation site. The electronic truck scale is also recommended to have a signal cable with a relatively long distance from the weighing room. It is not difficult to imagine that lightning strike can cause damage to the weighing instrument by introducing high potential on the lead through the electromagnetic induction path. Therefore, The signal line of the weighing sensor and the current power line that excites the weighing sensor are connected by cables that ground the shielding layer to eliminate the possibility of electromagnetic induction lightning damage or ignition. The shielding layer of the signal cable of the weighing sensor can be connected to the grounding wire of the weighing sensor, and the production process of the electronic weighbridge can also be connected to the grounding pile of the weighing display; It can be determined according to the site conditions, but it is not allowed to use two grounding piles at two points.

6、 The shell of the weighing display instrument shall be grounded. So. The grounding pile is set in the floor scale room and connected with the reinforcement mesh (grounding) in the foundation of the scale. When a plastic shell is used, a layer of metal film shall be sprayed on the inner surface of the shell before grounding.

7、 The junction box shall be grounded. The junction box shall be provided with a grounding wire connected to the scale body.

8、 The power supply shall be grounded and equipped with anti surge protector.

The above points will greatly enhance the safety and reliability of the electronic scale, especially those users in the Duolei area, who must pay attention to the above requirements when installing the electronic truck scale to ensure the safe use of the electronic truck scale.