Module error at 25 °c (77 °f) – Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules User Manual
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Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Chapter 2
ControlLogix Isolated Analog I/O Module Features
Module Error at 25 °C (77 °F)
lists the 1756-IRT8I module error at 25 °C (77 °F) when using a
thermocouple input type.
Table 4 - 1756-IRT8I Module Error At 25 °C (77 °F) with Thermocouple Input Type
Application
Temperature
Module Error at 25 °C (77 °F) When Connected to Thermocouple Types
Type B
Type C
Type D
Type TXK/
XK(L)
Type R
Type S
Type E
Type J
Type K
Type N
Type T
-200 °C (-328 °F)
1.65
1.79
2.06
2.95
4.53
2.86
0 °C (32 °F)
3.46
4.59
0.93
8.51
8.33
0.77
0.89
1.14
1.72
1.16
200 °C (392 °F)
2.65
2.83
0.71
5.09
5.32
0.61
0.81
1.13
1.36
0.85
400 °C (752 °F)
11.08
2.37
2.36
0.62
4.34
4.70
0.56
0.82
1.07
1.21
0.73
600 °C (1112 °F)
7.56
2.37
2.22
0.56
3.96
4.41
0.56
0.77
1.06
1.16
800 °C (1472 °F)
5.89
2.37
2.20
0.51
3.65
4.14
0.57
0.70
1.10
1.15
1000 °C (1832 °F)
4.93
2.37
2.25
3.40
3.90
0.60
0.76
1.15
1.17
1200 °C (2192 °F)
4.35
2.65
2.36
3.23
3.74
0.79
1.23
1.21
1400 °C (2552 °F)
3.99
2.81
2.47
3.18
3.71
1.33
1600 °C (2912 °F)
3.85
3.00
2.63
3.24
3.80
1800 °C (3272 °F)
3.92
3.46
2.85
3.67
4.36
2000 °C (3632 °F)
3.75
3.19
2200 °C (3992 °F)
4.09
3.95
IMPORTANT
When calculating total measurement error, module error at 25 °C (77 °F) is only
one factor in deriving the total measurement error budget.
Other factors that impact thermocouple measurement error include
the following:
• Thermocouple sensor accuracy/error
• Conditions of thermocouple wire, such as wire length
• Cold junction compensation values