Spectrum Controls 1756sc-IF8u - Manual (Page 31)

Chapter 2: Installing And Wiring Your Module
19
RTD Type Current Source V/ ° C
100 Ω Pt 385 1.008mA 357µV/ ° C
200
Ω
Pt 385 1.008mA 714µV/ ° C
500
Ω
Pt 385 252 µA 447µV/ ° C
1000 Ω Pt 385 252 µA 893µV/ ° C
100
Ω
Pt 3916 1.008mA 377µV/ ° C
200 Ω Pt 3916 1.008mA 754µV/ ° C
500
Ω
Pt 3916 252 µA 472µV/ ° C
1000 Ω Pt 3916 252 µA 941µV/ ° C
120
Ω
Ni 618 1.008mA 694µV/ ° C
200
Ω
Ni 618 1.008mA 1389µV/ ° C
500 Ω Ni 618 252 µA 867µV/ ° C
1000
Ω
Ni 618 252 µA 1733µV/ ° C
10
Ω
Cu 426 252 µA 9.7µV/ ° C
120 Ω Ni 672 1.008mA 929µV/ ° C
The accuracies specified for the IF8u RTDs do not include errors due to
lead resistance imbalances.
Important: To ensure temperature or resistance value accuracy, the
resistance difference of the cable lead wires must be equal to or less than
0.01 ohms.
Important: Keep total lead resistance as small as possible and less than
25 ohms.
There are several ways to insure that the lead values match as closely as
possible. They are as follows:
* Use quality cable that has a small tolerance impedance rating.
* Use a heavy gauge lead wire which has less resistance per foot.