Knowledge of the working principle of positive and negative pressure sensor

Knowledge of the working principle of positive and negative pressure sensor

Positive and negative pressure sensors are the most commonly used pressure sensors in industrial practice. They are widely used in various industrial automatic control environments, including petroleum pipelines, water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, military, petrochemical, oil well , Power, ships, machine tools, pipeline air supply, boiler negative pressure and many other industries.

working principle

The working principle of the positive and negative pressure sensor is that the pressure of the medium directly acts on the diaphragm of the sensor, causing the diaphragm to generate a micro-displacement proportional to the pressure of the medium, causing the resistance of the sensor to change, and detecting this change with an electronic circuit, and converting A standard signal corresponding to this pressure is output.

Attribute knowledge

1. Sensor: A device or device that can feel the specified measurement and convert it into a usable output signal according to a certain rule. Usually consists of sensitive components and conversion components.

â‘  Sensitive element refers to the part of the sensor that can be measured directly (or in response).

â‘¡Conversion element refers to the part of the sensor that can sense (or respond) the north side of the sensor and convert it into electrical signals that are transmitted and / or measured.

â‘¢When the output is a specified standard signal, it is called a transmitter.

2. Measuring range: the range of the measured value within the allowable error limit.

3. Range: the algebraic difference between the upper and lower limits of the measurement range.

4. Accuracy: The degree of agreement between the measured result and the true value.

5. Refolding: under all the following conditions, the degree of agreement between the results of multiple consecutive measurements of the same measured quantity:

6. Resolving power: the smallest change that can be detected by the sensor in the specified measuring range circle.

7. Threshold: the smallest change that can be measured at the output of the sensor.

8. Zero position: The state that minimizes the absolute value of the output, such as the equilibrium state.

9. Excitation: External energy (voltage or current) applied to make the sensor work properly.

10. Maximum excitation: the maximum value of the excitation voltage or current that can be applied to the sensor under city conditions.

11. Input impedance: The impedance measured at the input end of the sensor when the output is short-circuited.

12. Output: The amount of electricity generated by the sensor as a function of the external measurement.

13. Output impedance: The impedance measured at the output of the sensor when the input is shorted.

14. Zero output: Under the local conditions, the output of the sensor when it is measured as zero.

15. Hysteresis: within the specified range, when the measured value increases and decreases, the maximum difference in the output.

16. Late: The time delay of the output signal change relative to the input signal change.

17. Drift: In a certain time interval, the sensor output is finally measured and the undesired change is irrelevant.

18. Zero drift: the change in zero output at specified time intervals and indoor conditions.

19. Sensitivity: The ratio of the increment of the sensor output to the corresponding increment of the input.

20. Sensitivity drift: Changes in the slope of the calibration curve due to changes in sensitivity.

21. Thermal sensitivity drift: Sensitivity drift caused by changes in sensitivity.

22. Thermal zero drift: zero drift due to changes in ambient temperature.

23. Linearity: the degree to which the calibration curve is consistent with a certain limit.

24. Philippine linearity: the degree to which the calibration curve deviates from a specified straight line.

25. Long-term stability: the sensor can still maintain the ability to not exceed the allowable error within the specified time.

26. Inherent reliability: In the absence of resistance, the sensor's free (without external force) oscillation reliability.

27. Response: The characteristics of the measured changes at the time of output.

28. Compensated temperature range: The temperature range compensated by the sensor to maintain the range and zero balance within the specified limits.

29. Creep: When the measured machine has many environmental conditions that remain constant, the output changes within a specified time.

30. Insulation resistance: If there is no other regulation, it means the resistance value measured between the specified insulation parts of the sensor when the specified DC voltage is applied at room temperature

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