Manufacturing Technology Today

Neha Gupta ¹, Suresh Chandra Bhatt ¹, Arti Rani ¹, R. B. Sibal ¹, Y. P. Singh ¹

Affiliations
1 Temperature and Humidity Standards, National Physical Laboratory, Dr K.S Krishnan Marg, New Delhi-110012, IN

Abstract

Thermocouple is one of the most important and widely used temperature sensors in the research and industrial applications. Pt/Pd thermocouple is now a days becoming attraction of researchers to find its applications as a high temperature sensor. Investigation has been made, using tungsten strip lamp, a primary standard of non-contact thermometry, whose temperature correspondence was measured in terms of photoelectric current with the help of photoelectric linear pyrometer Photoelectric pyrometer has been used as a transfer standard for conferring the temperature of spherical blackbody furnace, which was used to measure the temperature of both Pt/Pd and type-S thermocouples in terms of their electromotive force by contact thermometry. Experimental results have shown the utmost linearity among two techniques used and also the advance characteristics of Pt/Pd thermocouple over type-S thermocouple in a high temperature range from 800 °C to 1300 °C. The uncertainty in the comparison from various sources was found to be within ±1.4 °C.

Keywords

Pt/Pd Thermocouple, Type-S Thermocouple, Pyrometer Blackbody Source, Tungsten Strip Lamp.

Full Text

     

Arti Rani ¹, Neha Gupta ¹, Suresh Chandra Bhatt ¹, Y. P. Singh ¹

Affiliations
1 Temperature and Humidity Standards, National Physical Laboratory, Dr. K. S Krishnan Marg, New Delhi-110012, IN

Abstract

In the present study a comparison between two different thermal sources maintaining near blackbody conditions has been carried out in the range from 50 °C to 500 °C. An infrared radiation pyrometer of make Land Pyrometer, Japan was used as a transfer standard to measure the temperature of blackbodies. The expanded uncertainty in the estimation of temperature of the radiating source in the above range of measurement was evaluated to be within ±1.03 °C, which shows that the radiation temperature sources are suitable for calibration of infrared total radiation pyrometers and thermal imaging devices in the operational range from 50 °C to 500 °C for laboratory and other industrial applications.

Keywords

IR-Radiation Pyrometer, Thermocouple, Blackbody Source & Emissivity.

Full Text