A pressure transducer is a device or apparatus capable of detecting pressure signals and converting them into usable electrical output signals according to a certain standard.
Typically, it consists of a pressure-sensitive element and a signal processing unit.
Depending on the type of pressure being tested, pressure transducers can be classified into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors.
Pressure sensors are one of the most commonly used sensors in industrial practices.
They are widely applied in various industrial automation environments, including hydropower, railway transportation, smart buildings, production automation, aerospace, military industry, petrochemicals, oil wells, electricity, ships, machine tools, pipelines and many other sectors.
When using a pressure transducer, correct zeroing and calibration are crucial to ensure accurate measurement results.
This article provides a detailed introduction to zeroing and calibration methods for pressure sensors, helping users understand how to operate them correctly, improving the accuracy and precision of the sensors.
Zeroing principle
Zeroing a pressure sensor means setting its output value to zero before use, establishing an accurate basis for subsequent experiments and measurements.
The sensor output value, called “zero offset”, is usually caused by external factors such as temperature changes, pressure variations or mechanical vibrations. By zeroing the sensor, you can nullify the impact of zero drift, ensuring the accuracy and stability of the sensor output.
Calibration principle
Sensor calibration focuses on correcting the discrepancy between the sensor output value and the actual measured value, an error known as “calibration drift”.
Sensor calibration is a vital operation as it effectively combats the drift phenomenon, improving the accuracy and precision of sensor measurement.
During calibration, the sensor output is compared to a standard measurement and adjustments are made to eliminate discrepancies by aligning the sensor output with the actual measured value.
Zeroing methods
Auto Zero :
Modern pressure sensors often come with an auto-zero feature that helps users automatically detect and correct sensor zero drift.
Typically, this function runs automatically within the first few minutes of sensor operation, ensuring that the sensor output remains stable. If your sensor does not have this feature, manual adjustment will be required to zero. Here is a simple procedure:
Manually reset :
Manual zero point adjustment is a conventional method and its operation is simple. First, depressure the sensor and connect it to a measuring device.
Then adjust the sensor output value to zero. When adjusting, consult the sensor user manual to ensure the accuracy and stability of your output.
