Thermal instrument intelligent calibration system and method

Abstract

The invention provides a thermal instrument intelligent calibration system and method. The system comprises an upper computer and a calibration platform, the calibration platform comprises a control unit, a digital programmable standard source, a standard thermostatic tank, a signal conditioning circuit, a CCD camera, a data collection card and an image collection card, the control unit is used for controlling output of the digital programmable standard source and temperature of the standard thermostatic tank according to a calibration instruction of the upper computer, the digital programmable standard source is used for calibrating a temperature transmitter without a sensor, the standard thermostatic tank is used for calibrating a temperature transmitter with a sensor and a pointer-typethermometer, the signal conditioning circuit is used for transmitting output signals of the transmitters to the data collection card, the CCD camera is used for acquiring a dial image of the pointer-type thermometer to be calibrated, and the upper computer is used for receiving signals of the data collection card and the image collection card for analyzing and processing and automatically generating a calibration report. The system can calibrate multiple instruments at the same time and automatically generate reports, and the whole calibration process is high in automation level.

Description

technical field [0001] The invention relates to the technical field of temperature measurement, in particular to an intelligent calibration system and method for a thermal instrument. Background technique [0002] Temperature measurement and control are of great significance in daily life, industrial production, agriculture and other fields. The operating status of equipment and the quality of production can often be indirectly reflected by parameters such as temperature and pressure. Therefore, the accuracy of temperature measurement plays an important role in the monitoring of production equipment. Temperature transmitter is a kind of instrument that is often used in the measurement and control of industrial process temperature parameters. Its working principle is to use temperature sensors such as thermal resistance or thermocouple to convert temperature variables into standard signal linear DC signal output and directly display its temperature. value. However, during t...

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Problems solved by technology

However, the current thermal instrument calibration system is still at the stage of on-site equipment inspection or a low degree of automation, and complicated wiring and preprocessing procedures are required for each calibration. The calibration equipment is bulky and heavy, and it is not easy to carry. Difficulty in on-site calibration

The existing portable calibrator can only calibrate a single transmitter at a time, and the efficiency is low; using a constant temperature bath for multi-channel calibration, although multiple detections can be performed, the time required for the constant temperature bath to reach the required experimental temperature Long, still takes a lot of time for multi-point measurements

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