Rockwell Automation T3431-CA ICS Regent Thermo Couple Input Assembly - Manual (Page 14)

Thermocouple Input Assembly (T3431)
1 4
Industrial Control Services
T/C
Type
Scale Lower
Limit
Upper
Limit
Lower
Limit
Upper
Limit
Lower
Limit
Upper
Limit
J ºC 0 750 0 750 0.0 750.0
ºF 32 1382 32 1382 32.0 1382.0
K ºC -200 1250 -200 1250 -200.0 1250.0
ºF -328 2282 -328 2282 -328.0 1638.3
S ºC 0 1450 0 1450 0.0 1450.0
ºF 32 2642 32 2642 32.0 1638.3
T ºC -200 350 -200 350 -200.0 350.0
ºF -328 662 -328 662 -328.0 662.0
Note for thermocouple types K and S: If a 0.1 ° F resolution is
selected, the maximum usable temperature is 1638.3 ° F.
Even though the range limit has not been reached, the value
will be clamped at 1638.3 because of word length limitations.
Changing the resolution jumper to units will allow the entire
data range to be passed without clamping.
Thermocouple Burnout Detection
Open thermocouple channels are automatically driven
downscale (downscale burnout). The temperature value will
be equal to the lower limit value for the particular
thermocouple type. An open circuit on either terminal will
cause a downscale reading. This is not affected by a ground
connection at the thermocouple.
In application programming, the NOSIG contact in ladder
logic can be used to sense the thermocouple burnout
condition. For more information, see Programming, starting
on page 21.
Installation Planning
Accuracy Considerations
Use the following guidelines to maximize overall system
accuracy:
1. Temperature gradients should be minimized at the
termination panel. Avoid forced air cooling or placing heat
dissipating components directly underneath the terminal