Abstract
The characteristics of two kinds/types of well-known TVO sensors are compared. They differ, probably, with respect to the quality of initial components and the shade of their green ceramic coating. Detailed information about long-term stability of the first kind of sensors are presented 10 years after calibration for a fairly large group of 52 pieces at room temperature, in liquid nitrogen and liquid helium, at atmospheric pressure and at Ts ≈ 1.9 K. Another group of 31pieces similar sensors was tested 15 years after calibration at room temperature, in liquid nitrogen and in liquid helium at atmospheric pressure. These sensors are based on TVO resistors produced previously, in the year 1991. Sixty pieces of the second kind of TVO resistors produced in 2009 were thermo-cycled between room temperature and 77.3 K, and two groups of 7 and 9 pieces were selected for test on their stability during 2.5 years at room temperature, in liquid nitrogen and in liquid helium at atmospheric pressure. A comparison shows noticeably better performances for the first kind of TVO resistors of dark green color. In particular, their sensitivity is roughly twice as high at liquid helium temperature. Information regarding the stability of well-known Cernox Cx-1030 sensors 9 years after calibration is also presented for comparison.
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