Instructions for using Bosch Rexroth Aventics pressure sensors from Germany

A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules.
Pressure sensors typically consist of pressure sensitive components and signal processing units. According to different types of testing pressure, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors.
When choosing a pressure sensor, we need to consider its overall accuracy, and what aspects affect the accuracy of the pressure sensor? There are actually many factors that can cause sensor errors. Below, we will focus on four unavoidable errors, which are the initial errors of sensors.
The first offset error: Due to the constant vertical offset of the pressure sensor throughout the entire pressure range, changes in the diffusion of the converter and laser adjustment correction will result in offset errors.
Instructions for using aventics pressure sensorsNext is sensitivity error: the magnitude 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 due to changes in the diffusion process.
The third is linear error: this is a factor that has a relatively small impact on the initial error of the pressure sensor. The cause of this error is the physical nonlinearity of the silicon wafer, 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 for weighing sensors.
Next is hysteresis error: In most cases, the hysteresis error * of pressure sensors can be ignored because silicon wafers have high mechanical stiffness. Generally, hysteresis error only needs to be considered in situations where there is a significant change in pressure.
pressure sensor
Aventics cylinderThe four errors of pressure sensors cannot be avoided, and we can only choose high-precision production equipment to reduce these errors. We can also perform certain error calibration at the factory to minimize errors as much as possible to meet customer needs.
There are many types of pressure sensors, and their performance varies greatly. How to choose the most suitable sensor to achieve economical and reasonable use.
1. Rated pressure range
The rated pressure range is the pressure range that meets the standard specified values, and the sensor output is the pressure range that conforms to the specified working characteristics. In practical applications, the pressure measured by the sensor is within this range.
2. Large pressure range
The high pressure range refers to the large pressure that the sensor can withstand for a long time without causing any changes in the output characteristics. Especially for semiconductor pressure sensors, in order to improve linearity and temperature characteristics, the rated pressure range is generally significantly reduced. Therefore, even if used continuously above the rated pressure, it will not be damaged. Generally, the maximum pressure is 2-3 times the rated pressure value.
3. Damaged pressure
Damaged pressure refers to the high pressure that can be applied to the sensor without damaging the sensor components or sensor housing.
4. Linearity
Linearity refers to the significant deviation in the linear relationship between sensor output and pressure within the working pressure range.
5. Pressure hysteresis
The difference in sensor output when approaching a certain pressure between small and large working pressures at room temperature and within the working pressure range.
6. Temperature range
The temperature range of pressure sensors is divided into compensation temperature range and operating temperature range. The compensation temperature range is the temperature range within which the accuracy enters the rated range due to the application of temperature compensation. The working temperature range is the temperature range that ensures the normal operation of the pressure sensor.