What is the compensation function of digital pressure switch?
The compensation function of the digital pressure switch refers to the function of correcting and adjusting the output signal of the pressure sensor through the built-in intelligent algorithm or circuit in order to improve the accuracy and stability of pressure measurement. This compensation can eliminate or reduce the impact of environmental changes (such as temperature), sensor characteristics (such as nonlinearity, hysteresis, etc.) and interference factors during the measurement process on the measurement results.
What are the main compensation functions of digital pressure switches?
The compensation function of the digital pressure switch mainly includes the following aspects:
1. Temperature compensation
• Principle: The characteristics of pressure sensors change with temperature, thus affecting the measurement accuracy. The temperature compensation function monitors changes in ambient temperature or the sensor’s own temperature by building a temperature sensor into the digital pressure switch or using a specific temperature compensation algorithm, and makes corresponding corrections to the pressure measurement results to ensure that accurate pressure values can be obtained under different temperature conditions.
• Implementation method: It is common to install a temperature sensor near the pressure sensor to sense temperature changes in real time. When the temperature changes, the compensation circuit or software algorithm will automatically adjust the pressure measurement value according to the preset temperature characteristic curve. For example, some digital pressure switches use a high-precision thermistor as the temperature sensor, which, in combination with a compensation algorithm in the microprocessor, is capable of controlling temperature-induced errors within a very small range over a wide temperature range.
• Significance: In environments such as industrial sites, temperature changes are more complex. The temperature compensation function of the digital pressure switch can effectively reduce the measurement error caused by temperature fluctuations, improve the accuracy and reliability of pressure measurement, and thus ensure the accuracy of pressure monitoring and control in the industrial production process.
2. Zero point compensation
• Principle: During the manufacturing, installation and long-term use of the pressure sensor, zero point offset may occur. That is, when the actual pressure is zero, the measured value of the pressure switch is not the exact zero value. The zero point compensation function is to automatically calibrate and correct this zero point offset through software or hardware methods, so that the pressure switch can accurately display the zero value under zero pressure state.
• Implementation method: Generally, a zero point calibration is performed when a digital pressure switch is used for the first time or during regular calibration. By pressing a specific key or using an external calibration device, the current measured value under zero pressure is set as the zero point reference value. After that, during normal measurement, the system will automatically perform zero point compensation on the measurement result based on the reference value to ensure the accuracy of the zero point.
• Significance: Zero point compensation can eliminate the measurement error caused by zero point offset and improve the initial accuracy of pressure measurement. Zero point compensation is especially important for measuring small pressure changes, as it helps to more accurately determine whether the pressure has actually reached the set threshold, thereby avoiding misjudgment and malfunction.
3. Full scale compensation
• Principle: When a digital pressure switch measures pressures in different ranges, the measurement accuracy near the full scale may decrease due to factors such as the nonlinear characteristics of the sensor, changes in circuit parameters and other factors. The full-scale compensation function analyzes and calibrates the output characteristics of the sensor and makes appropriate corrections to the measured value when it is close to the full scale to ensure that the measurement accuracy within the entire range can meet the requirements.
• Implementation method: Usually during the production and calibration process of the pressure switch, the measurement accuracy at different range points is calibrated and adjusted to determine the compensation coefficient at full scale. In actual measurement, when the pressure is close to the full scale, the system will correct the measured value according to the pre-set compensation coefficient to make it closer to the true value.
• Significance: Full-scale compensation can effectively improve the measurement accuracy of digital pressure switches within the entire measuring range, especially for application scenarios that require accurate measurement of pressure values close to full-scale. Such as pressure monitoring of high-pressure vessels, which can ensure the accuracy and reliability of measurement results, thereby ensuring the safe operation of equipment and the normal progress of the production process.
What is the application effect of the compensation function of the digital pressure switch?
- Improve measurement accuracy: The compensation function can significantly reduce measurement errors caused by factors such as temperature, zero offset, full-scale error, etc., making the pressure measurement value closer to the true value, meeting the needs of high-precision pressure measurement, such as precise batching in chemical, pharmaceutical and other industries. , Reactor pressure control, etc.
- Enhanced reliability: Through the compensation function, the digital pressure switch can always maintain stable and accurate measurement performance in complex and changeable working environments and long-term use, reduce false operations and failures caused by measurement errors, improve system reliability and stability, and ensure continuous and stable operation of industrial production.
- Expand the scope of application: With the compensation function, the digital pressure switch can work normally in a wider temperature range, different pressure ranges and various complex working conditions without frequent replacement or adjustment of equipment. It is suitable for pressure monitoring and control in many industrial fields and different processes, such as petrochemical, metallurgy, electric power, machinery manufacturing and other industries.
- Optimize control performance: Accurate measurement is the basis of accurate control. The compensation function improves the measurement accuracy of the digital pressure switch. It enables more accurate control and alarm according to the set threshold, achieving more precise pressure control. It improves production efficiency and product quality, reduces energy consumption and costs, such as in a constant pressure water supply system, it can more accurately maintain the stability of water supply pressure.
