Error correction method of platinum thermal resistance sensor and heat meter for temperature measurement by the method
A platinum thermal resistance and error correction technology, applied in the field of measurement and control, can solve the problems of many temperature points, large differences and low production efficiency for calibration and correction
Active Publication Date: 2017-12-05
HUNAN WEIMING ENERGY TECH CO LTD
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Problems solved by technology
However, during production of this method, due to the large number of temperature points to be calibrated and corrected, the production efficiency will be very low
Therefore, in order to improve production efficiency, most manufacturers reduce the calibration of temperature points in the actual production process, resulting in a large difference between the temperature-correction compensation coefficient curve and the actual situation, and cannot ensure that the temperature measurement error is within the full-scale temperature range. accuracy within
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[0045] Such as figure 1 Shown is the measurement diagram of the PT1000 platinum thermal resistance of the present invention: the platinum thermal resistance measurement principle is to use the PT1000 platinum thermal resistance of the temperature sensor as the temperature measuring element, first measure the resistance value of the platinum thermal resistance, and then convert the resistance value into temperature. The measurement of PT1000 platinum thermal resistance is carried out by the capacitance charging and discharging method, that is, the principle that the platinum thermal resistance with different resistance values discharges the same capacitor to a certain voltage value takes different time to indirectly reflect the resistance value of the resistance.
[0046] The measurement of the platinum thermal resistance is based on the measurement of the discharge time of the capacitance to the PT1000 platinum thermal resistance and the temperature-insensitive 1K resistance...
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The invention provides an error correction method for a platinum thermal resistance sensor. The method comprises following steps: the range of temperature and degree of accuracy of the platinum thermal resistance temperature sensor are obtained; error correction points are calculated; error correction is performed to the platinum thermal resistance temperature sensor to obtain a curve of average measured temperature-correction and compensation coefficients; one error correction point is selected as a basic temperature point; measurement correction is performed to the platinum thermal resistance temperature sensor to be corrected on the basis of the basic temperature point; temperature measurement error correction within the full temperature range is performed to the platinum thermal resistance temperature sensor to be corrected; The invention also provides a calorimeter which measures temperature using the error correction method for the platinum thermal resistance sensor. By use of the method, the temperature measurement accuracy of a platinum thermal resistance sensor is increased, and the production efficiency, calibration and correction efficiency of platinum thermal resistance temperature sensors are greatly increased. The provided calorimeter performs temperature measurement and temperature correction using the error correction method for the platinum thermal resistance sensor, and has accurate measurement.
Description
technical field [0001] The invention belongs to the field of measurement and control, and in particular relates to an error correction method of a platinum thermal resistance sensor and a heat meter using the method. Background technique [0002] With the development of the country's economy and technology, the heating system has gradually entered thousands of households, bringing a comfortable and convenient life to the broad masses of the people. The heat meter is an instrument used in the heating system to measure and display the value of the heat released or absorbed by the water flowing through the heat exchange system. It is a key instrument in the system that charges by heat. Its measurement data is an important basis for heat metering and charging in the heating system, so its measurement accuracy, working stability and other technical indicators are very important for both the heating system and the user. [0003] The heat meter mainly consists of a flow sensor, a ...
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IPC IPC(8): G01K15/00G01K7/18G01K17/00
CPCG01K7/18G01K15/005G01K17/00
Inventor 张慧娟蒋罗庚
Owner HUNAN WEIMING ENERGY TECH CO LTD