Author(s)

Yuqi Lan^1,2*, Shenyin Yang², Guangming Chen¹, Sifeng Yang²

¹Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou, China.
²Beijing Institute of Aerospace Testing Technology, Beijing, China.

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 × 10⁻⁴ + 6.54 × 10⁻⁴ ln(R/R_ref) + 2.46 × 10⁻⁵ ln(R/R_ref)² + 9.48 × 10⁻⁷ ln(R/R_ref)³ − 2.16 × 10⁻⁸ ln(R/R_ref)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.

Thermometer, Cryogenics, Thermistors, Calibration, Cryostat

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.