10.14489/td.2023.08.pp.040-049

2023, 08 August

DOI: 10.14489/td.2023.08.pp.040-049

Golobokov M. V.
METROLOGICAL SUPPORT FOR THE VERIFICATION OF MERCURY THERMOMETERS
(pp. 40-49)

Abstract. Modern liquid thermostats used for checking mercury thermometers reproduce a temperature of no more than 300 °C, while the upper limit of measurements of some types of mercury thermometers reaches 600 °C. The paper theoretically substantiates and experimentally confirms the possibility of checking mercury thermometers in temperature calibrators. The measurement equation has been compiled. The components of the transmission error of the unit of magnitude are estimated. Conditions are formulated that allow a priori to assess the possibility of checking a particular type of thermometer in a particular calibrator. All calculations are made taking into account the changes in the state verification scheme. The design of a special thermometer for studying the heterogeneity of the temperature distribution outside the working area of the calibrator channel is proposed. The dependence of the readings of a special thermometer on the depth of immersion is theoretically estimated. The disadvantages of the currently used method for determining the temperature of the protruding mercury column are noted. It is proposed to measure the temperature of the protruding column with a thermal imager, an accuracy analysis is performed. The results of experimental studies of the inhomogeneity of the temperature distribution outside the working area of the channel of the calibrator KT-2M are presented. The reproducibility of measurement results when checking thermometers in a calibrator and a liquid thermostat is estimated.

Keywords: temperature calibrator, verification, thermal imager, mercury thermometer.

+ - About the Authors Click to collapse

M. V. Golobokov (State regional center of standardization, Metrology and testing in the Novosibirsk region (FBA “Novosibirsk CSM”), Novosibirsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Thermometers are glass liquid workers. Verification procedure. (1978). Ru Standard No. GOST 8.279–78. Moscow: Izdatel'stvo standartov. [in Russian language]
2. Direct multiple measurements. Methods of processing measurement results. (2011). Ru Standard No. GOST 8.736–2011. Moscow: Izdatel'stvo standartov. [in Russian language]
3. State verification schedule for temperature measuring instruments. (2022). Saint Petersburg: VNIIM. [in Russian language]
4. Mikheev M. A., Mikheeva I. M. (1977). Fundamentals of heat transfer. Moscow: Energiya. [in Russian language]
5. Kuznetsov G. V., Sheremet M. A. (2007). Difference methods for solving thermal conductivity problems. Tomsk: Tomskiy politekhnicheskiy universitet. [in Russian language]
6. Zinov'ev V. E. (1989). Thermophysical properties of metals at high temperatures. Moscow: Metallurgiya. [in Russian language]
7. Larikov L. N., Yurchenko Yu. F. (1985). Thermal properties of metals and alloys: handbook. Kiev: Naukova dumka. [in Russian language]
8. Leko V. K., Mazurin O. V. (1985). Properties of quartz glass. Saint Petersburg: Nauka. [in Russian language]
9. Quartz optical glass. General technical conditions. (1999). Ru Standard No. GOST 15130–86. Moscow: Izdatel'stvo standartov. [in Russian language]
10. Thermometric glass. Marks. (2003). Ru Standard No. GOST 1224–71. Moscow: Izdatel'stvo standartov. [in Russian language]
11. Golobokov M. V. (2017). Model of a blackbody on the basis of the thermostat TERMOTEST-05-02. Kontrol'. Diagnostika, (11), pp. 40 – 44. [in Russian language] DOI: 10.14489/td.2017.11.pp.040-044
12. Golobokov M. V. (2021). Metrological support for the verification of medical infrared thermometers. Kontrol'. Diagnostika, Vol. 24 (9), pp. 26 – 32. [in Russian language] DOI: 10.14489/td.2021.09.pp.026-032
13. Glass thermometers for testing petroleum products. Technical conditions. (1994). Ru Standard No. GOST 400–80. Moscow: Standartinform. [in Russian language]
14. Thermometers are glass mercury electrocontact and thermoregulators. Technical conditions. (1994). Ru Standard No. GOST 9875–71. Moscow: Standartinform. [in Russian language]
15. Liquid glass thermometers. General technical requirements. Test methods. (1990). Ru Standard No. GOST 28498–90. Moscow: Standartinform. [in Russian language]
16. Means of contact temperature measurement. Calibration procedure. (2020). MK 03-67–20. Novosibirsk: FBU “Novosibirsk TsSM” [in Russian language]

+ - Purchase digital version of a single article Click to collapse

This article is available in electronic format (PDF).

The cost of a single article is 500 rubles. (including VAT 20%). After you place an order within a few days, you will receive following documents to your specified e-mail: account on payment and receipt to pay in the bank.

After depositing your payment on our bank account we send you file of the article by e-mail.

To order articles please copy the article doi:

10.14489/td.2023.08.pp.040-049

and fill out the form