Four errors of pressure sensor

When selecting a pressure sensor, we must consider his comprehensive accuracy. What are the effects of pressure sensor accuracy? In fact, there are many factors that cause sensor error. Here we note four unavoidable errors. This is the initial error of the sensor.

First offset error: Since the vertical offset of the pressure sensor remains constant over the entire pressure range, variations in the spread of the diffuser and laser trim will produce offset errors. Followed by the sensitivity error: the size of the error is proportional to the pressure. If the sensitivity of the device is higher than the typical value, the sensitivity error will be an increasing function of pressure. If the sensitivity is lower than the typical value, the sensitivity error will be a decreasing function of pressure. The reason for this error is the change in the diffusion process. The third is the linearity error: This is a factor that has little effect on the initial error of the pressure sensor. The reason for this error is the physical nonlinearity of the silicon, but for the sensor with amplifier, it should also include the nonlinearity of the amplifier. The linear error curve can be a concave curve or a convex curve load cell. The last is the lag error: In most cases, the lag error of the pressure sensor is completely negligible because of the high mechanical stiffness of the silicon wafer. It is generally only necessary to consider the hysteresis error in the case where the pressure changes greatly.

The four errors of the pressure sensor are unavoidable. We can only choose high-precision production equipment and use high technology to reduce these errors. We can also carry out a little error calibration at the factory and try our best to reduce the error. Meet the needs of customers.