Table 4-1. Platinum Rtd Types - National Instruments Module SCXI-1503 User Manual

Chapter 4 Theory of Operation
SCXI-1503 User Manual
Although the resistance-temperature curve is relatively linear, accurately
converting measured resistance to temperature requires curve fitting. The
following Callendar-Van Dusen equation is commonly used to approximate
the RTD curve:
R
=
T
where
R is the resistance of the RTD at temperature T.
T
R is the resistance of the RTD at 0 C.
0
A, B, and C are the Callendar-Van Dusen coefficients shown in
Table 4-1.
T is the temperature in C.
Table 4-1 lists the RTD types and their corresponding coefficients.
Temperature
Coefficient of
Standard (TCR, PPM)
IEC-751
DIN 43760
BS 1904
ASTM-E1137
EN-60751
Low cost
vendor
1
compliant
JISC 1604
US Industrial
Standard D-100
American
2
R 1 AT BT C T 100
+ + +
0

Table 4-1. Platinum RTD Types

Resistance Typical
R
0
3851 100
1000
3750 1000
3916 100
3920 100
4-8
3
–
Callendar-Van
Dusen Coefficient
–3
A = 3.9083 10
–7
B = –5.775 10
–12
C = –4.183 10
–3
A = 3.81 10
–7
B = –6.02 10
–12
C = –6.0 10
–3
A = 3.9739 10
–7
B = –5.870 10
–12
C = –4.4 10
–3
A = 3.9787 10
–7
B = –5.8686 10
–12
C = –4.167 10
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