GW Instek GOM-805 - Page 150

APPENDIX
151
PT-100 sensor are listed below:
Type
Standard
Alpha
Beta
Delta
Ω @ 0˚C
PT-100
ITS90
0.003850
0.10863
1.49990
100Ω
Temperature
Calculation Example
Example—Calculating the resistance of a PT-100
RTD at 100˚C (T). The following R
0
(Ωat 0˚C),
alpha, beta, and delta values are used for the
PT-100 RTD:
T=100˚C
R0 (Ω at 0˚C) = 100Ω
Alpha=0.003850
Beta=0.10863
Delta=1.49990
A, B, and C are calculated according to equations
listed above:
A=0.00391
B=5.77e-7
C=4.18e-12
The resistance of the RTD at 100˚C (R
100
) is then
calculated as follows:
R100: =R0[1+AT=BT
2
+CT
3
(T-100)]
=100{1+[(0.00391)(100)]+[(-5.77e-7)(100
2
)
+[(-4.18E-12)(100
3
)(100-100)]]}
=138.5Ω
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