Русская версия English version

Determination of thermal response time of thermal resistance transducers

E.D. Marshalov, A.N. Nikonorov, I.K. Muravev

Vestnik IGEU, 2017 issue 3, pp. 54—59

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Abstract in English: 

Background: Accuracy and quality of measurements are important characteristics in operation and adjustment of modern control systems. The most common characteristics are temperature measurements. One of the main indicators of temperature sensors is thermal response time. Dynamic properties of the sensors influence the settings of automatic controls and, consequently, the quality of the control system as a whole, but they are studied much worse than the static properties. Therefore, it is quite urgent and important to study dynamic properties of temperature sensors.

Materials and methods: The authors have chosen a method of determining dynamic characteristics of temperature sensors which consists in removing the acceleration curve when the temperature of the medium surrounding the sensor changes abruptly from one steady-state value to another. The problem set was solved by using platinum thermal resistance transducers, precision calibration equipment, and the method of combining acceleration curves at «zero lines».

Results: The authors have obtained transient characteristics for four thermal resistance transducers at different temperature changes. By processing the obtained transient characteristics, the authors calculated their values for the confidence level of 0,95. It is shown how the diameter of the mounting part of the temperature sensors influences their dynamic characteristics. It has been shown that when the sensors are placed in the same processing medium with the same velocity of sensor flow with the processing medium, the dynamic characteristics are greatly affected by the mounting part diameter, which is caused by the thermal conductivity characteristics of the sensor for different sensor wall thicknesses; the length of the mounting part does not play a significant role because the temperature-sensitive sensor element is located at its working end, i.e. the sensitive elements of all the sensors were tested in the same temperature field.

Conclusions: The dynamic characteristics of the temperature sensors obtained experimentally show that when the diameter of the mounting part of the thermal resistance transducer is changed by a factor of 2,5, the time of the thermal reaction changes by a factor of 4. The obtained results can be used when choosing temperature sensors for technological control objects, as well as when designing and commissioning automated process control systems, and when setting up automatic control systems to optimize the quality of the regulators, while implementing technological protections and interlocks.

Key words: thermal resistance transducer, dynamic characteristics, thermal response time, temperature calibrator, control system, transitional processes.

References in English: 

1. Marshalov, E.D. Issledovanie dinamicheskikh kharakteristik termopreobrazovateley soprotivleniya [Research into dynamic characteristics of thermal resistance]. Sbornik nauchnykh trudov Mezhdunarodnoy nauchno-tekhnicheskoy konferentsii: «Sostoyanie i perspektivy razvitiya elektro- i teplotekhnologii». V 4 t., t. 2 [A collection of scientific works of the International Scientific Conference «The Condition and Prospects of Developing Electric Power and Heat Technologies». In 4 vol., vol. 2]. Ivanovo, 2015, pp. 263–266.

2. Marshalov, E.D. Eksperimental'noe issledovanie datchikov temperatury [Experimental research into temperature sensors]. Trudy VI Mezhdunarodnoy nauchno-tekhnicheskoy konferentsii «Elektroenergetika glazami molodezhi». V 2 t., t. 2 [Proceedings of the VIth International Scientific Conference «Power Industry: Viewpoint of the Youth». In 2 vol., vol. 2]. Ivanovo, 2015, pp. 341–342.

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5. Iosifov, V.P. Opredelenie polnykh dinamicheskikh kharakteristik sredstv izmereniy s primeneniem rekurrentnykh protsedur [Determination of complete dynamic characteristics of measuring instruments by using recurrent procedures]. Izvestiya vysshikh uchebnykh zavedeniy. Povolzhskiy region. Tekhnicheskie nauki, 2011, no. 1(17), pp. 126–131.

6. Froehlich, T., Augustin, S., Ament, C. Temperature-Dependent Dynamic Behavior of Process Temperature Sensors. International Journal of Thermophysics, 2015, vol. 36, no. 8, pp. 2115–2123.

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Ключевые слова на русском языке: 
термопреобразователь сопротивления, динамические характеристики, время термической реакции, калибратор температуры, система регулирования, переходные процессы
Ключевые слова на английском языке: 
thermal resistance transducer, dynamic characteristics, thermal response time, temperature calibrator, control system, transitional processes
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