With the development of modern measurement and automation technology, the consumption of pressure load cells is increasing at a rate of 20% every year. At present, there are a wide variety of pressure sensors on the market, with different specifications and technical performances, as well as great price differences. The question faced by customers is what kind of pressure load cell should they choose to meet their needs? This involves the selection of sensors, many customers choose the principle of the sensor is to buy the most economical price pressure range, accuracy requirements, temperature range, power and mechanically required pressure sensors. In fact, the selection of the sensor depends on the external environmental factors in its project and the internal factors of the sensor itself. Let's talk about a few external project factors that must be considered when choosing a pressure load cell:
1. In different application scenarios, the corresponding sensors should also be selected according to changes in the environment. When the working environment of the pressure load cell is harsh, such as high temperature/vibration, large shock, and large electromagnetic interference, more stringent requirements are placed on the sensor. Not only the overpressure capability is strong, but also the mechanical seal is reliable, preventing loosening, and the sensor is installed correctly. The leads, pins and outer wires of the sensor itself should be electromagnetically shielded, and the shielded leads should be well-grounded.
2. The operating mode of the sensor is also an important issue to consider. For example, when the sensor is used to measure gas pressure, the situation is different from liquid pressure. Gas is a compressible fluid. When it increases, it stores a certain amount of compressive energy and releases kinetic energy when decompressed, and applies a shock wave to the sensor elastic membrane. Pressure-excited sensors require a large overload capacity. The liquid is an incompressible fluid. When the pressure load cell is installed, tighten the bolts and there is no compression space, which will cause the liquid pressure to exceed the pressure limit of the elastic membrane, resulting in the rupture of the elastic membrane. Because this situation often occurs, the excitation sensor also requires a large overvoltage capability.
3. The requirements for the ambient temperature of the application of the pressure load cell are as follows:
The pressure load cell prepared by semiconductor chip has the characteristic of being greatly affected by temperature, not only thermal zero drift, but also thermal sensitivity drift. Temperature significantly affects the accuracy of pressure-excited sensors. In order to eliminate the effect of temperature, various temperature compensation techniques need to be applied. The wider the temperature range, the more difficult the compensation technique, the greater the calibration effort, and the lower the accuracy over the full temperature range. Therefore, reasonable requirements should be put forward according to the actual temperature range and accuracy requirements of the pressure load cell. When the pressure load cell is used indoors, you can choose commercial-grade; when you use it outdoors, you can choose the industrial-grade, the sensor can also be isolated from the environment or heated or cooled, below -10C or above 60°C
For use in the environment, the electronic temperature characteristics and mechanical temperature characteristics of the sensor should also be considered.
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