I/O Terminal Block Wiring Diagrams; Table 15 - Typical Thermocouple Resistance In Ohms Per Double Foot @ 68 Degrees F - Honeywell 900U02-0100 User And Installation Manual

6.7.

I/O Terminal Block Wiring Diagrams

Universal Analog Input Module Wiring
The Universal Analog Input Module has eight inputs, which can include any combination of the
following input types: RTD, TC, Ohms, Millivolt, Volt, or Milliamp. Figure 47 shows wiring examples of
each of the analog input types. An example of wiring for eight TC inputs is given in Figure 49.
Specifications for this module and for other modules are given in the Specifications section of this
manual.
ATTENTION
To indicate sensor failure the Analog Input software will output a warning if
thermocouple resistance > 80 ohms. Use appropriate gauge wiring to prevent
inaccurate failure warnings.
Table 15 – Typical Thermocouple resistance in Ohms per Double Foot @ 68 degrees F
AWG No. Diameter
inches
10 0.102
12 0.081
14 0.064
16 0.051
18 0.040
20 0.032
24 0.0201
26 0.0159
30 0.0100
Table values are shown as a reference only; actual values may vary. Consult manufacturer specifications.
Isolation
This module has eight inputs, which are isolated except for RTD current sources.
RTD Inputs
RTD inputs share current sources (two RTD inputs per source), as shown in Figure 46, Figure 47 and
Figure 48.
For example, the current source for the RTD input at channel one (terminals 1 and 2) is terminal 3 (I
1 & 2). This same current source (I
and 5).
Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual
May 2019
Type K Type J Type T
0.058 0.034 0.029
0.091 0.054 0.046
0.146 0.087 0.074
0.230 0.137 0.117
0.374 0.222 0.190
0.586 0.357 0.298
1.490 0.878 0.7526
2.381 1.405 1.204
5.984 3.551 3.043
1 & 2) is also used for an RTD input at channel two (terminals 4
RTD
Type E Type S Type R
Pt/ PT110 Pt/ PT113
0.069 0.018 0.018
0.109 0.028 0.029
0.175 0.045 0.047
0.276 0.071 0.073
0.448 0.116 0.119
0.707 0.185 0.190
1.78 0.464 0.478
2.836 0.740 0.760
7.169 1.85 1.91
Type W5/ Type W/
W26 W26
0.023 0.020
0.037 0.031
0.058 0.049
0.092 0.078
0.148 0.126
0.235 0.200
0.594 0.560
0.945 0.803
2.38 2.03
RTD
95