
APPENDIX
13/10/2016 Version No. 001
195
equation shown below:
RRTD=R
0
[1+AT+BT
2
+CT
3
(T-100)]
Where: RRTD is the calculated resistance of the RTD.
R
0
is the known RTD resistance at 0˚C.
T is the temperature in˚C
A=alpha [I+(delta/100)]
B=-I(alpha)(delta)(Ie-4)
C=-I(alpha)(beta)(Ie-8)
The Alpha (A), Beta (B), Delta (D) values for the 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:
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