70
Chapter 5
5.4.4.3.1
RTD Constants
The constants entered for an RTD depend on the type of curve it has. Table 8 shows
three standard types.
Curve
Laboratory
US
European
The Ro constant also applies for RTD sensors. It is nominally 100.00 Ω, but can be
varied from 95.00 Ω to 105.00 Ω.
Temperature Controller Operation
TCR
C1
(Ω Ω Ω Ω /Ω Ω Ω Ω /° ° ° ° C)
.003926
3.9848x10
.003910
3.9692x10
.003850
3.9080x10
Table 8 - RTD Constants
C2
-3
-6
-0.58700x10
-3
-6
-0.58495x10
-3
-6
-0.58019x10
C3
R0
-12
4.0000x10
100.00
-12
-4.2325x10
100.00
-12
-4.2735x10
100.00