Advances in Materials Physics and Chemistry

Volume 10, Issue 8 (August 2020)

ISSN Print: 2162-531X   ISSN Online: 2162-5328

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Characteristics of a Type of NTC Thermistors for Cryogenic Applications

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DOI: 10.4236/ampc.2020.108012    179 Downloads   353 Views  

ABSTRACT

A new type of miniature negative temperature coefficient (NTC) thermistors has been developed and manufactured with Mn-Ni-Cu-Fe oxides. The prepared NTC thermistors were calibrated in the temperature range from 77 K to 300 K with 1 μA exciting currents. The automatic calibration apparatus as well as thermometric characteristics, stability, calibration equations and interchangeability of the manufactured thermistors were investigated. A mean fit equation was obtained: 1/T = 8.60 × 104 + 6.54 × 104 ln(R/Rref) + 2.46 × 105 ln(R/Rref)2 + 9.48 × 107 ln(R/Rref)3 2.16 × 108 ln(R/Rref)4. All the prepared NTC thermistors agreed with this fit with an error of 1.5 K. If the greater accuracy is required, a calibration is necessary, and the calibration accuracy is estimated to be ±10 mK.

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Lan, Y. , Yang, S. , Chen, G. and Yang, S. (2020) Characteristics of a Type of NTC Thermistors for Cryogenic Applications. Advances in Materials Physics and Chemistry, 10, 167-177. doi: 10.4236/ampc.2020.108012.

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