7-14
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
If you have set “characteristic linearization” and “temperature compensation”
with the operating mode switches on module 464–8MA21 for the thermocou-
ple used, the reference temperature is 0 _C (32 _F). This means that with
0 _C (32 _F) at the measuring junction, the value “0” is displayed.
If you equip several channels with thermocouples, use the same type of ther-
mocouple. If you select mixed thermocouples, or if you use thermocouples
other than type J, K, or L, then you must choose the following settings:
S “No linearization”
and
S “No temperature compensation”
Compensation is then not possible even with a compensating box because the
compensating box is designed only for a certain type of thermocouple.
It is possible to use a thermostat in the terminal box if you use the thermostat
temperature in the application software to adjust the thermocouple input off-
set.
When you set the switches to “no linearization” and “no temperature com-
pensation,” module 464–8MA21 functions just like module 464–8MA11.
Analog Value Processing
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