Fig.6-3:
Line frequency
6.2
Operating modes
Different software-configurable operating modes can be selected:
●
Thermocouple measurement with internal terminal temperature compen-
sation (default configuration)
●
Thermocouple measurement with external terminal temperature compen-
sation
6.2.1
Measurements with internal compensation
As the thermocouple measurement with internal cold junction compensation
constitutes the standard application it is set as default.
●
With this measuring process the thermocouple is directly or indirectly via
a thermo-compensation line connected to the TM 240/A.
●
The compensation of the terminal temperature is achieved with an internal
temperature measurement sensor.
●
The measurement value is linearized and forwarded to the CPU in °C.
●
No temperature measurement sensor is connected to the sensor interface.
Information
To ensure the highest precision it is recommended to mount the TM 240/A in
a calm air environment and away from power electronics, heating and venti-
lation elements.
6.2.2
Measurement with external compensation
In case the thermocouples are extended with Cu-wires, the temperature of the
terminal point (point of comparison)
must
be measured with the temperature
measurement sensor TE 220/A.
TM 240/A, TE 220/A for KeStudio U3
Functional description
© KEBA 2011
Project engineering manual V1.10
19
Summary of Contents for Kemro TM 220/A
Page 4: ......
