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. It is usually composed of a pressure sensitive element and a signal processing unit. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.
Pressure sensors are the most commonly used sensors in industrial practice. They are widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military industry, petrochemicals, oil wells, electricity, ships, machine tools, pipelines, etc.
When using a pressure sensor, correct zeroing and calibration are essential to ensure accurate measurement results of the sensor. This article will give a detailed introduction to the zeroing and calibration methods of pressure sensors to help readers understand how to correctly operate pressure sensors and improve the accuracy and precision of sensor use.
1. Zeroing principle
The zeroing of the pressure sensor means adjusting the output value of the sensor to zero before use, laying an accurate foundation for subsequent experiments and measurements.
The output value of the sensor is called "zero drift". In most cases, zero drift is caused by external factors, such as temperature changes, pressure changes, mechanical vibrations, etc. By zeroing the sensor, the sensor output value can be returned to zero, eliminating the influence of zero drift, and ensuring the accuracy and stability of the sensor output value.
2. Calibration Principle
The calibration operation of the sensor is to correct the error between the output value of the sensor and the actual measured value. This error is called "calibration drift".
The calibration operation of the sensor is a very important operation. It can effectively eliminate the drift phenomenon of the sensor and improve the accurate measurement ability and precision of the sensor.
During calibration, it is necessary to compare the output value of the sensor with the standard measured value, and eliminate the error by adjusting the parameters of the sensor so that the output value of the sensor is consistent with the actual measured value.
3. Zeroing method
3.1 Use the automatic zeroing function
Modern pressure sensors are usually equipped with an automatic zeroing function, which can help users automatically detect and eliminate the zero drift of the sensor.
Usually, this function will run automatically in the first few minutes of the sensor device operation to ensure that the output value of the sensor is in a stable state. If your sensor does not have an automatic zeroing function, you need to perform zero calibration through manual adjustment.
3.2 Manually adjust the zero point
Manually adjusting the zero point is one of the traditional zero adjustment methods, and its operation is very simple. First, place the sensor in a pressure-free state and connect the pressure sensor and the measuring equipment.
Then, adjust the sensor output value to zero. When adjusting the zero point, it is necessary to adjust it according to the sensor manual to ensure the accuracy and stability of the sensor output value.
