Full-automatic accurate pressure testing control instrument

Abstract

This invention relates to an automatic pressure gage fine control instrument, which can realize the automatic pressure making, automatic pressure stabilizing, automatic measuring, etc in large pressure range. This invention comprises control system, which is separately connected, with pressure system and measurement system. The pressure system is connected with measurement. The control system comprises single machine, which is connected with pressure sensor of the measurement system. The single machine is separately connected with fine servo valves, gas-in magnetic valve, gas-out magnetic valve and fine servo control valve through the control signal generator.

Description

1. Technical field: [0001] The invention relates to a full-automatic precision pressure calibration controller, which can be used for precise and full-automatic calibration and measurement of pressure measurement products such as pressure gauges, pressure switches, pressure sensors, and pressure transmitters. 2. Background technology: [0002] In the background technology, common instruments used as pressure references include piston pressure gauges and digital pressure calibrators, wherein the accuracy index of the piston pressure gauge is calibrated according to the weight of the weight, usually reaching 0.05% or 0.05% of the pressure value indicated by the weight 0.02%, the accuracy index of the digital pressure calibrator is usually calibrated according to the full scale of the pressure sensor configured by the calibrator, and usually can reach 0.05% or 0.02% of the full scale. Piston pressure gauge is a mechanical reference instrument for pressure measurement, which can...

AI Technical Summary

Problems solved by technology

Piston pressure gauge is a mechanical reference instrument for pressure measurement, which can better meet the high precision requirements for measurement of a wide pressure range. The disadvantage is that it is bulky and heavy. Accuracy indicators are discontinuous and not intuitive

The digital pressure calibrator is a highly intelligent pressure measuring instrument that integrates precision measurement technology, sensor technology, and microcomputer technology. Its main advantages are: intuitive reading, continuous measurement of pressure at any point within the reading range, light weight, and Portable use, the main disadvantage is that the accuracy index can only reach 0.05% or 0.02% of the full scale, so for the measurement of low-range pressure, such as 10% of the full-scale pressure, the measurement accuracy of the calibrator can only reach the reading value 0.5%, which is far from meeting the high-precision measurement requirements, has become a relatively serious performance defect of current digital pressure calibrator products

In order to overcome the above-mentioned precision defects and meet the high accuracy requirements of different ranges, usually a calibrator needs to be equipped with many standard range probes. On the one hand, it requires frequent installation and replacement of probes during use; The need for range measurement makes the purchase cost very large

In addition, most digital pressure calibrator adopts manual pressurization and manual fine-tuning to stabilize the pressure, which is very inconvenient to control and use.

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