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 × 10−4 + 6.54 × 10−4 ln(R/Rref) + 2.46 × 10−5 ln(R/Rref)2 + 9.48 × 10−7 ln(R/Rref)3 − 2.16 × 10−8 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.
Highlights
Many cryogenic applications require a large number of temperatures to be monitored in various areas of cryogenic engineering and low-temperature physics
All the prepared negative temperature coefficient (NTC) thermistors agreed with this fit with an error of 1.5 K
Together with the six calibrated thermistors were immersed in liquid nitrogen for 300 h, and short-term stability data was obtained by subjecting NTC thermistors to 50 thermal shocks from 473 K to 77 K
Summary
Many cryogenic applications require a large number of temperatures to be monitored in various areas of cryogenic engineering and low-temperature physics. The advantages of NTC thermistors for temperature measurement are the high sensitivity to yield a high resolution and the high resistivity permits small mass units with fast response. This makes them compatible for using requiring a high output signal over a relatively narrow temperature range [7] [8]. The automatic calibration apparatus, stability, calibration equations and interchangeability of prepared thermistors were investigated
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
