Thermal Conductivity (K) Calibration - C-THERM TCi Operator's Manual

TCi Operator Manual
For example, CF=a*(1/m)+b. If a=1.1 and b=0.3, and the measured 1/m=100, then the corrected
1/m to be used for the calculation of effusivity and k would be 110.3 (1/m is automatically
corrected by software).
Presently, 2 CAs other than water are used, glycol for low temperature (down to -50C) and
Wakefield 120 thermal grease for high temperatures, extended testing, and porous or absorbent
materials. Hopefully, in future only one CA would be specified for the complete temperature
range, thus no CF would be needed.
Contact Agent
Water
Glycol
Wakefield 120 Thermal
Grease
Note: foams and liquids do not need a CA, and therefore no CF.
9.4

Thermal conductivity (k) calibration

Calibration and measurements of k are based on same data acquired for effusivity. The same
separation into material groups and power levels, and contact agents apply for k as well.
100
Cal Method
Polymers, Ceramics, Metals
Polymers, Ceramics
Metals
Polymers
Ceramics
Temperature A
5 to 70°C 1.0
-50 to 5°C 1.020
-50 to 5°C 1.050
-50 1.127
-25 1.091
0 1.057
20 1.031
25 1.025
50 0.995
75 0.968
100 0.942
125 0.918
150 0.897
175 0.877
200 0.859
-50 0.969
-25 0.985
0 0.998
20 1.004
25 1.006
50 1.010
75 1.010
100 1.006
125 0.998
150 0.987
175 0.971
200 0.951
B
0
0.000
0.000
-8.332
-5.598
-3.230
-1.599
-1.227
0.410
0.963
0.963
0.963
0.963
0.963
0.963
15.562
10.281
5.461
1.936
1.101
-2.799
-6.238
-9.217
-11.736
-13.795
-15.393
-16.531