• Temperature calibrate coal resistors

Temperature calibrated coal resistors TVO are proposed as temperature sensors to be used in various types of cryostats and variable temperature cryostats-inserts. The calibration is performed at 20 temperature points by the use of the Rh secondary temperature standard. The polynomial approximation of experimental points ensures small temperature step and high accuracy in temperature measurements. The highly reliable performance of the coal resistors allows hundred thousands thermal cycles in the temperature region 1.8 – 300 K without any changes in mechanical properties and temperature calibration.

Fig.1. Temperature sensor TVO

3-points calibration

Application:

Safety control for superconducting solenoids

• MR imaging unit

• ESR spectrometer

• NMR spectrometer

Calibration points:

• Room temperature

• Liquid nitrogen temperature T = 77.4 K

• Liquid helium temperature T = 4.2 K

20-points calibration

Fig.2. Temperature-resistance dependence for the sensor TVO in T = 1.8 – 300 K

Parameters:

• Calibration temperature range T = 1.8 – 300 K

• High sensitivity

• Low magnetic field dependence

Calibration:

• 20 calibration points

• Polynomial fit coefficients

• Fitting points interval ΔT = 0.01 K

• Number of the calibration points can be increased

Technical parameters