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Improving temperature measurement algorithms for two-wire connection of a resistance thermometer
https://doi.org/10.32446/0368-1025it.2023-4-57-62
Abstract
The existing ways to reduce the errors in measuring the temperature of objects and media with resistance thermometers are considered. These errors are caused by the infl uence of the resistance of the connecting lines. It is shown that the methods used in industry to reduce this effect and the corresponding errors are based on three- and four-wire circuits for connecting resistance thermometers, which complicates the measuring circuits and increases the cost of connecting lines. A two-wire connection scheme is described, which can signifi cantly reduce the infl uence of the connecting line on the accuracy of temperature measurement. This circuit is characterized by simple design and lower cost compared to three- and four-wire connection schemes. To reduce the sensitivity to interference and quantization noise while simultaneously reducing the measurement time, it is proposed to include a digital voltage integrator of the transient discharge process voltage of the capacitor shunting the resistance thermometer in the two-wire circuit. A method for two-wire temperature measurement with resistance thermometers has been practically implemented using the developed algorithm for measuring and processing the results of digital integration of the transient voltage. Multiple measurements of the reference resistance with a nominal value of 1 kOhm were performed using the two-wire temperature measurement method using digital integration and the method based on the assessment of the voltage drop on the resistance thermometer based on the results of measurements at two points of the transient curve. The conducted experimental studies have confi rmed the effectiveness of the method of two-wire temperature measurement using digital integration. The method can be used in systems for monitoring the parameters of the air environment and technological processes.
About the Authors
O. G. Bondar
Southwest State University
Russian Federation
Russian Federation
Oleg G. Bondar
Kursk
E. O. Brezhneva
Southwest State University
Russian Federation
Russian Federation
Ekaterina O. Brezhneva
Kursk
A. Yu. Zubarev
Southwest State University
Russian Federation
Russian Federation
Alexander Yu. Zubarev
Kursk
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Review
For citations:
Bondar O.G., Brezhneva E.O., Zubarev A.Yu. Improving temperature measurement algorithms for two-wire connection of a resistance thermometer. Izmeritel`naya Tekhnika. 2023;(4):57-62. (In Russ.) https://doi.org/10.32446/0368-1025it.2023-4-57-62
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