Pressure controller and pressure calibration method based on same

Abstract

The invention provides a pressure controller and a pressure calibration method based on the same, the pressure controller comprises an input unit, a built-in pressure measurement unit, a control unit, a pressure control mechanism and an external pressure measurement interface, in an on-line calibration state, an external pressure measurement module and the external pressure measurement interface are in sealed communication, the external pressure measuring module measures the output pressure of the pressure control mechanism and generates a calibration pressure value, and the control unit obtains the calibration pressure value from the external pressure measuring module and records the corresponding output pressure value and the calibration pressure value for generating calibration data. The measurement precision of the external pressure measurement module is at least higher than the pressure control precision of the pressure controller so as to meet the calibration requirement; and the pressure controller has an online calibration mode, the pressure controller can be calibrated while the required pressure is provided for the external pressure demand equipment, and therefore the off-production condition of calibration of a traditional pressure controller is avoided.

Description

technical field [0001] The invention relates to the technical field of pressure calibration, in particular to a pressure controller, a pressure gauge calibration method based on the pressure controller, and a pressure controller online calibration method. Background technique [0002] The pressure controller may have a built-in pressure generating device, or an external pressure generating device may be used. The pressure controller will control the pressure generated by the pressure generating device, so that the pressure output by the pressure controller can meet the application needs of the industrial scene , therefore, it is widely used in various industrial fields such as metering, pharmaceuticals, and chemicals; one of the more typical application scenarios, in the metering field, the pressure controller will be used as the source of the calibration pressure during the calibration process. Generally speaking, the calibration pressure needs Reach and stabilize at the ca...

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Problems solved by technology

[0002] The pressure controller may have a built-in pressure generating device, or an external pressure generating device may be used. The pressure controller will control the pressure generated by the pressure generating device, so that the pressure output by the pressure controller can meet the application needs of the industrial scene , therefore, it is widely used in various industrial fields such as metering, pharmaceuticals, and chemicals; one of the more typical application scenarios, in the metering field, the pressure controller will be used as the source of the calibration pressure during the calibration process. Generally speaking, the calibration pressure needs Reach and stabilize at the calibration pressure point (that is, a specific pressure value), if the accuracy of the pressure controller is insufficient or even significantly shifted, the output calibration pressure may not actually reach the calibration pressure point, which will affect the calibration work Effectiveness; Another typical application scenario, in the manufacturing field, the pressure controller will provide the required working pressure for the pharmaceutical process. The actual working pressure deviates from the expected working pressure, which will adversely affect the production process; in order to ensure sufficient accuracy of the pressure controller, regular calibration of the pressure controller is required

[0003] Unlike general pressure gauges, pressure transmitters and other pressure measurement equipment or pressure calibration equipment, the output product of the pressure controller is pressure rather than the measured value of pressure. Therefore, when calibrating the pressure controller, it is necessary to calibrate The target is also the output pressure of the pressure controller; in general, to calibrate the pressure controller, it is necessary to remove the pressure controller from the actual working scene, set the calibration point according to the situation of the pressure controller, and in the special calibration scene Use a standard device to measure its output pressure value. In this case, for the external equipment that originally provided the required pressure by the pressure controller, even if other pressure controllers are used to work, it must be stopped due to the reconnection of the pipeline. Work, as we all know, in many industrial manufacturing scenarios, the consequences of line stop are very serious, especially for pressure scenarios, because the reconnection of pipelines itself will have adverse effects on pressure scenarios (increasing the risk of pressure leakage), The reconnection of the high-voltage scene requires a series of operations such as stepping down, reconnecting, boosting, and stabilizing the voltage, which will affect more time. In addition, if the medium that loads the pressure is toxic and harmful gas or liquid, its handling is also very troublesome

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