Pressure Sensor Cannot Avoid The Cause Of Error

When choosing a pressure sensor, we have to consider its comprehensive accuracy. What are the influences on the accuracy of the pressure sensor? In fact, there are many factors that cause sensor errors. Below we pay attention to four unavoidable errors, which are the sensor’s Initial error.

The first offset error: Since the vertical offset of the pressure sensor remains constant throughout the pressure range, changes in the spread of the transducer and the laser adjustment correction will produce offset errors.

The second is 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 cause of this error is the change in the diffusion process.

The third is linearity error: This is a factor that has a small effect on the initial error of the pressure sensor. The cause of the error is the physical nonlinearity of the silicon chip, but for sensors with amplifiers, the nonlinearity of the amplifier should also be included. The linear error curve can be a concave curve or a convex curve load cell.

The latter is the hysteresis error: in most cases, the hysteresis error of the pressure sensor is completely negligible, because the silicon chip has a high mechanical stiffness. Generally, only the hysteresis error needs to be considered when the pressure changes greatly.

The four errors of the pressure sensor are unavoidable. We can only choose high-precision production equipment, use high-tech to reduce these errors, and perform a certain error calibration at the factory to reduce the error as much as possible. To meet customer needs.