A thermal diffusion type liquid level switch test system and test method

By constructing a dedicated test circuit adapted to different media phases, the alarm response range of the thermal diffusion level switch was accurately calibrated, solving the problems of complexity, cumbersome operation, and high cost of existing test systems, improving test efficiency and accuracy, and making it suitable for performance testing of level switches in various media phases.

CN122408925APending Publication Date: 2026-07-17XI AN JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XI AN JIAOTONG UNIV
Filing Date
2026-06-03
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing thermal diffusion level switch test systems are complex in structure, cumbersome in operation, and expensive. They are difficult to quickly and accurately obtain output voltage data under different media conditions, and the test methods lack dedicated test circuit designs for different phase media, resulting in large test errors and low efficiency.

Method used

A dedicated test circuit adapted to different media phases is constructed, including a media control system, a test section system, a data acquisition system, and valve components. Through components such as high-pressure vessels, plunger pumps, condensers, and thermocouples, precise control of media temperature and pressure and real-time acquisition of key parameters are achieved. Combined with LabVIEW software, the output voltage value is recorded, and the accurate alarm response range is obtained by utilizing the differences in the thermal conductivity of the media.

Benefits of technology

It significantly reduces test errors, improves test efficiency and accuracy, simplifies operation steps, reduces construction costs, is suitable for performance testing of thermal diffusion level switches in various media phases, and provides reliable data support.

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Abstract

The application provides a thermal diffusion type liquid level switch test system and test method, the system comprises a high-pressure container, a heating wire, a plunger pump, a condenser, a thermocouple, a pressure transmitter, a differential pressure liquid level meter and several valves; the method comprises: determining the phase state of the medium to be measured, calibrating the position of the thermal diffusion type liquid level switch on the high-pressure container and standardizing the spacing of adjacent switches to prevent interference, ensuring that the liquid level switch probe is immersed in the medium to be measured, adjusting the temperature and pressure in the high-pressure container by means of the heating wire, plunger pump and other temperature and pressure adjusting means to make the medium in the high-pressure container reach a constant temperature and pressure, connecting the liquid level switch with a high-precision voltage acquisition card, combining the known position and model parameters of the thermal diffusion type liquid level switch, using the principle that the output voltage is different due to the difference in thermal conductivity characteristics of different media, obtaining the output voltage value under different medium working conditions, so as to set appropriate alarm response values. The application can quickly obtain target data without complex tests, has strong universality, low cost, simple steps and high precision, and can efficiently complete alarm range setting.
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