The load cell has the same appearance and different quality

The load cell belongs to the load cell, which is a commonly used measuring instrument, which is often used for static measurement and dynamic measurement. Load cells have a wide range of applications, and they have certain applications in industry, electronics, electricity, metallurgy, and machinery.

From the surface, it seems that a traditional load cell is simply composed of aluminum or hardened steel elements, resistance strain gauges, compensation resistors, interconnecting wires, filling materials, and plating or paint. So how many differences are there between two load cells with the same appearance?

Suppose a high-quality industrial load cell has: good moisture resistance-moisture is the primary cause of load cell failure; durability-^ conservative design also makes the sensor withstand more than 100,000 cycles of loading, Without fatigue failure; compliance with published technical specifications including linearity, hysteresis and temperature compensation; from the performance of one batch of sensors to the consistency of another batch of products. Not all sensors produced by sensor manufacturers meet these performance requirements.

The load cells produced by different manufacturers look the same, but there will be differences in performance, reliability and consistency. There are two main aspects: The first is the role of durability: the basic design of the load cell ^ is to determine its durability, it must withstand 100,000 times of weighing, and will not cause failure due to mechanical fatigue. The computer finite element analysis is used to optimize the design of the load cell so that there is no stress concentration in any part of the sensor, so that the stress can be uniformly concentrated on the strain gauge. This sophisticated design ensures that the load cell can withstand overload.

The second is the moisture-proof effect: the resistance strain gauge in the load cell is easily affected by moisture. Moisture entering the resistance strain gauge may cause unstable performance or even overall failure of the load cell.

Therefore, the moisture-proof design of the load cell is based on the following points:

1. Encapsulate the resistance strain gauge-cover the strain gauge with waterproof material.

2. Control the environment or create a low humidity environment-prevent moisture from entering the sealed load cell.

3. High-quality composite waterproof seal-keep the sensor's components unaffected under the entire working temperature, and has a small permeability.

4. Welding and sealing, glass and metal cable joints are sometimes effective.

5. The high-quality load cell cable tightly combines the conductor and the shell to prevent moisture from entering the inside through the cable core.