Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules - Manual (Page 41)

Rockwell Automation Publication 1756-UM540A-EN-P - May 2014 41
ControlLogix Isolated Analog I/O Module Features Chapter 2
Thermocouple Error
Thermocouple error at 25 °C (77 °F) indicates the module’s accuracy in
measuring temperature. This accuracy varies depending on these factors:
• Input range = -100…100 mV.
• Thermocouple sensor type, any of the following:
–
Type B
– Type C
– Type D
– Type E
– Type J
– Type K (default value)
– Type N
– Type R
– Type S
– Type T
– Type TXK/XK (L)
• Application temperature, that is, the temperature of the physical location
where the thermocouple is being used.
EXAMPLE When a 1756-IRT8I module is used with a thermocouple input type in the
following conditions, module error at 25 °C (77 °F) is ±3.74 °:
• Connected to a type S thermocouple
• Application temperature of 1200 °C (2192 °F )
In other words, the difference between the temperature the module
reports and the actual application temperature can be ±3.74 °.
The module can report an application temperature of 1200 ° C (2192 °F ) in
this case when the actual temperature can be in the range from
1196.26…1203.74 °C (2185.268…2198.732 °F
).
These calculations used a typical error of 0.02% of full scale range.