When choosing a pressure sensor, we need to consider its comprehensive accuracy, and what are the aspects that affect the accuracy of the pressure sensor? In fact, there are many factors that cause sensor error, and we will pay attention to four unavoidable errors, which are the initial error of the sensor.
First Offset Error: Since the vertical offset of the pressure sensor remains constant throughout the pressure range, changes in converter diffusion and laser adjustment correction will produce offset errors.
The second is the sensitivity error: the magnitude of the resulting error is proportional to the pressure. If the sensitivity of the device is higher than typical, the sensitivity error will be an increasing function of the pressure. If the sensitivity is lower than the typical value, then the sensitivity error will be a decreasing function of the pressure. The reason for this error is the change in the diffusion process.
The third is linearity error: this is a factor that has little influence on the initial error of the pressure sensor, which is caused by the physical nonlinearity of the silicon wafer, but for sensors with amplifiers, the nonlinearity of the amplifier should also be included. The linearity error curve can be either a concave curve or a convex curve load cell.
Finally, there is the hysteresis error: In most cases, the hysteresis error of the pressure sensor is completely negligible due to the high mechanical stiffness of the silicon wafer. In general, hysteresis errors only need to be taken into account in the case of large pressure variations.
The four errors of the pressure sensor are unavoidable, we can only choose high-precision production equipment, use the latest technology to reduce these errors, and can also carry out certain error calibration at the time of delivery, as much as possible to reduce the error to meet the needs of customers.
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