Device and method for thermal resistance fault diagnosis

Abstract

The invention discloses a thermal resistor fault diagnosis device and method. The thermal resistor fault diagnosis device comprises a thermal resistance tester and a portable mobile terminal, wherein the thermal resistor tester is connected with the portable mobile terminal through a USB data line; and the thermal resistor tester is connected to an RTD sensor of a tested thermal resistor through a signal line. By adopting a thermal resistor circuit step current response time method, a traditional temperature probe diagnosis function can be achieved, diagnosis information can be provided for an installation environment heat conduction change of a probe, the installation position condition of a temperature probe and the aging trend of the temperature probe, and a reasonable and effective suggestion can be provided for preventative maintenance and corrective maintenance of the temperature probe.

Description

technical field [0001] The invention relates to the technical field of thermal resistance fault diagnosis, and more specifically, relates to a thermal resistance fault diagnosis device and method. Background technique [0002] For thermal resistance fault diagnosis, the Wheatstone balanced bridge is used to test the resistance value of thermal resistance, which is widely used in industrial temperature acquisition cards. At present, the fault diagnosis scheme of the traditional temperature probe itself generally needs to dismantle the temperature probe from the field back to the laboratory for calibration and calibration, not through specific tools, but through a series of maintenance and inspection methods, such as the temperature probe. Calibration, insulation continuity inspection of the temperature probe, and the traditional temperature probe inspection method can only provide a diagnostic function for the fault of the probe itself, but cannot draw conclusions about the i...

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Problems solved by technology

[0003] In view of this, the present invention provides a thermal resistance fault diagnosis device and method to solve the problems in the prior art due to the thermal balance principle, starting from the addition of current, and finally reaching a stable system under test, which is the step current response time of the equipment. Trend, when the measured system reaches thermal equilibrium, the resistance value will remain at a constant value, but the temperature is stable within the accuracy range of 1‰, which requires a long online measurement time, which will bring a lot of time to the on-site measurement time. Unfavorable, coupled with the fact that the on-site measurement time is too long, although the continuity inspection can be realized, the original working environment has changed greatly, and the data errors obtained from the previous and subsequent measurements are large.

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