I/O Terminal Block Wiring Diagrams; Table 15 - Typical Thermocouple Resistance In Ohms Per Double Foot @ 68 Degrees F - Honeywell HC900 User And Installation Manual

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 43 shows wiring examples of each of the
analog input types. An example of wiring for eight TC inputs is given in Figure 45.
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 42, Figure 43, and Figure 44.
For example, the current source for the RTD input at channel one (terminals 1 and 2) is terminal 3 (I
2). This same current source (I
Revision 6
21 April 2017
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 and 5).
RTD
HC900 Process & Safety Controller User and Installation Manual
Type S Type R
Type E
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
1 &
RTD
91