Automatic CalibrationSystem ForTemperature Sensor

Temperature measurement in industrial and agricultural production, scientific research, environmental protection, energy saving, and People’s Daily life plays an important role. Thermocouple and thermal resistance temperature sensor has been widely used in industrial production and daily life application, the regulations of measurement, temperature sensor in the process of using the need for periodic verification and calibration work, to ensure the accuracy of the temperature sensor temperature measurement, temperature effective transfer of the value. The traditional metrological verification process need to rely on manual operation, low efficiency, strength and error-prone, difficult to ensure that test automation and standardization.With the development of science and technology of measuring temperature sensor of measuring content are also great changes happening, measurements in continuous improvement, the technical characteristics of the measuring instruments in constantly improve, and the corresponding verification regulations and calibration of standard, improve the revision of the industry standard is also advancing with The Times. Therefore, the temperature sensor metrological verification request has been improved. This paper discusses the automatic temperature sensor calibration system; the design and implementation of thermal metering areas need the thermocouple and thermal resistance sensors for automatic verification and calibration. Verification system mainly includes:the calibration furnace, high precision temperature controller, hot low thermal potential switch, DMMS, visual automatic verification of upper machine software. Software part, subject PC software, using c++Builder platform development system will ITS90scale conversion formula and standard of thermal resistance, industrial thermal resistance, thermocouple, precious metal thermocouple and inexpensive metal thermocouple verification regulation of data processing algorithm is integrated into the application, realize the automation of the test data processing. The hardware part, subject design based on island power SR93high-precision calibration furnace thermostat, Then according to the requirement of the verification regulation of high temperature furnace for rapid and stable temperature control.Application developed by thermal again low thermal potential switch and high precision digital millimeters based on verification code requirements, automatic gathering place multiplexer channel in the thermal furnace temperature control of thermocouple and thermal resistance sensor analog signal output values. Data collected through the PC software for processing, whether it conform to the requirements of the verification and calibration, the research content belongs to thermal measuring academic areas.Subject research design temperature sensor for automatic calibration system is a collection of computer technology, electronic measurement technology, and automatic control technology in the integration of the automatic verification system. Subject adopts high precision temperature control, temperature control time shortened, and use the computer control switch and DMMS low thermal electric potential data of automatic data collection, automated verification process, which not only greatly improve the working efficiency, and improve the reliability of data, and to reduce the labor intensity of the commissioner, make temperature sensor detection capability has a larger increase. The system can be widely used in measurement, war industry, electric power, oil field, metallurgy, chemical industry, etc.