Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial self-control environments, involving water conservancy and hydropower, railway transportation, intelligent building, production automation, aerospace, military, petrochemical, oil well, electric power, ship, machine tool. , pipelines and many other industries, then and daily use and maintenance is particularly important, the following small series for you to introduce in detail.
When choosing a pressure sensor, we should consider his comprehensive precision, and what is the accuracy of the pressure sensor? In fact, there are many factors that cause the sensor error. Below we pay attention to the four unavoidable errors, which are the sensor Initial error.
Offset error:
Since the vertical displacement of the pressure sensor remains constant over the entire pressure range, variations in transducer diffusion and laser adjustment correction will produce offset errors.
Sensitivity error:
The magnitude of the error produced 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 the pressure. If the sensitivity is lower than the typical value, the sensitivity error will be a decreasing function of the pressure. This error is caused by a change in the diffusion process.
Linearity error:
This is a factor that has little effect on the initial error of the pressure sensor. The error is due to the physical nonlinearity of the silicon chip, but for the sensor with the amplifier, the nonlinearity of the amplifier should also be included. The linear error curve can be a concave curve or a convex curve.
Lag error:
In most cases, the hysteresis error of the pressure sensor is completely negligible because the silicon wafer has a high mechanical stiffness. It is generally only necessary to consider the hysteresis error in situations where the pressure varies greatly.
These 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 little error calibration at the factory to minimize the error. Meet the needs of customers.
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