Transmitter fault diagnosis circuit and method thereof

Abstract

The invention relates to a transmitter fault diagnosis circuit and a method thereof. The fault diagnosis circuit comprises a sensor, a signal processing module, a standard signal input module, and a change over switch. The change over switch connects with the sensor and the signal processing module, and connects with the standard signal input module and the signal processing module simultaneously. According to the invention, a standard signal is inputted to the signal processing module through the standard signal input module, and connection between the sensor and the signal processing module or connection between the standard signal input unit and the signal processing module is switched through the change over switch. When a fault appears, the change over switch disconnects the connection between the sensor and the signal processing module, and connects the standard signal input module with the signal processing module, the standard signal is inputted to the signal processing module through the standard signal input module, according to the standard signal, the signal processing module carries out processing, followed by outputting, if an output result is normal, the sensor has a fault. Conversely, the signal processing module has a fault. The transmitter fault diagnosis circuit has the characteristics of simple structure, low cost and convenient maintenance.

Description

technical field [0001] The invention relates to a fault diagnosis circuit of a transmitter. In addition, the invention also relates to a fault diagnosis method of a transmitter. Background technique [0002] Sensors play an irreplaceable role in scientific research and technology development, especially in information technology, automation technology, modern manufacturing and other technologies. Pressure sensors are currently the most widely used sensors and are widely used in petroleum, chemical, etc. Industrial fields and national defense fields such as aviation and aerospace. [0003] Nowadays, pressure transmitters are used more and more. In actual work, due to the influence of various environmental factors, pressure transmitters will be damaged or malfunction, resulting in no output or abnormal signals. Under normal circumstances, it is difficult to determine the specific damaged part when the pressure transmitter is broken. The damaged part may be the sensor core or ...

AI Technical Summary

Problems solved by technology

[0003] Nowadays, pressure transmitters are used more and more. In actual work, due to the influence of various environmental factors, pressure transmitters will be damaged or malfunction, resulting in no output or abnormal signals.

Under normal circumstances, it is difficult to determine the specific damaged part when the pressure transmitter is broken. The damaged part may be the sensor core or the transmitter processing module. It is difficult to quickly locate the fault. Now many manufacturers are dealing with the failed pressure transmitter. It is customary to dismantle the pressure transmitter when using the transmitter, and check it according to the conventional method, which is troublesome to check and repair, and consumes time and manpower

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