NTC Thermistor Performance and Linearization of its Temperature-Resistance Characteristics Using Electronic Circuit

Authors

  • K.T. Aminu
  • A. G. Jumba
  • A. A. Jimoh
  • A. Shehu
  • B. D. Halilu
  • S. A. Baraza
  • A. S. Kabiru
  • M. A. Sule Department of Electrical Engineering Abubakar Tatari Ali Polytechnic Bauchi Nigeria

DOI:

https://doi.org/10.31695/IJASRE.2020.33854

Keywords:

Temperature measurement, Thermistor sensor, Practical design, Nonlinearity

Abstract

This paper critically discusses the performance of an NTC thermistor sensor in the temperature range 20 oC to 85 oC and provides a technique for linearization of the temperature sensed by the thermistor. The linearization was achieved by utilizing Wheatstone bridge electronic circuitry which responds to the thermistor and produces an output which is an exponential function of the temperature sensed by the thermistor sensor. A further simple and low-cost electronic circuitry responds to such output and converts the resistance measurement to provide a signal which represents the temperature. Moreover, the Wheatstone bridge signal conditioning circuitry was designed to have 0 – 100 mV output voltage within the considered temperature range. The physical characteristics of the thermistor (constant A and b ) were found to be 4.0015 x 10-5 ± 0.2956 x 10-5 Ω and 3514.8 ± 11.6 K respectively. The result also shows that the percentage nonlinearity was as low as 1.7 and a sensitivity value of 1.5661 mV/K was found for the thermistor, but the resolution of this thermistor sensor is 2 oC. However, the percentage of nonlinearity obtained was in agreement with the theoretical percentage nonlinearity.

References

Wiendartun, R., and Fitrilawati, R. E. 2016. The Effect of Sintering Atmosphere on Electrical Characteristics of Fe2TiO5 Pellet Ceramics sintered at 1200 oC for NTC thermistor, Journal of Physics: Conference Series 739

Zhang, D., Shi, M. J., Chen, L. L., and Ding, S. J. 2013. Designing of Thermistor Digital Thermometers based on unbalanced Electric Bridge, Trans. Tech. Publications, Switzerland, Key Engineering Materials 538, Pp 133 – 137

David, P. 1996. Measuring Temperature with Thermistors - a Tutorial, National Instruments Application Note 065

Morris, A. S. 2001. Measurement and Instrumentation Principles, third edition

Newman, W.H., Mass, B., Burgess, R.G., and Hudson, N. H. 1992. Temperature Measurement Using Thermistor Elements, Medical Physics, Vol. 10(3), Pp. 327 – 332

Munifah, S. S., Risdiana, W., and Aminudin, A. 2019. Design of Temperature Measuring Instrument Using NTC Thermistor of Fe2TiO5 Based on Microcontroller, Journal of Physics: Conference Series 1280

Jack, K. E., Nwangwu, E. O., Etu, I. A., and Osuagwu, E. U. 2016. A Simple Thermistor Design for Industrial Temperature Measurement, IOSR Journal of Electrical and Electronics Engineering, Vol. 11(5), Pp. 57 – 66

Chakravarty, R. K., Slater, K., and Fischer, C. W. 1977. Linearization of Thermistor Resistance-Temperature Characteristics Using Active Circuitry, Review of Scientific Instruments, Vol. 48(12), Pp 1645-1649

Published

2020-08-25

How to Cite

K.T. Aminu, A. G. Jumba, A. A. Jimoh, A. Shehu, B. D. Halilu, S. A. Baraza, A. S. Kabiru, & M. A. Sule. (2020). NTC Thermistor Performance and Linearization of its Temperature-Resistance Characteristics Using Electronic Circuit. International Journal of Advances in Scientific Research and Engineering (IJASRE), ISSN:2454-8006, 6(8), 35-49. https://doi.org/10.31695/IJASRE.2020.33854

Issue

Section

Articles