There are two types in linearization - one is analog
and the other is digital.
Model M2TS Thermocouple transmitter uses the analog linearization.
We curve-fit the temperature-emf curve with seven (7) segments of
linear lines within the instrument accuracy specification, for each
thermocouple type and the measuring ranges. The curve-fitting is shown
in the figure. By using the linear segments, the transmitter generates
its output, e.g. 4-20mA DC directly proportional to the measured temperature.
Model M2XT Thermocouple transmitter, containing a microprocessor,
uses digital linearization. It stores the temperature-emf tables at
1°C increments. Within the increment, the microprocessor calculates
the measured temperature by proportioning. |
 |
| M-System has flexible solutions to meet your
specific application and requirements. Consult our Signal Conditioners
Data Library. |
|
How
can we obtain a linearized signal from a thermocouple?
A
linearizer, analog type or digital type, is required to obtain the signal
proportional to the measured temperature, since the emf of a thermocouple
is not linear. M-System Models M2XT and M2TS Thermocouple Transmitters contain
the linearizing function. When you use these transmitters, you do not need
a separate linearizer.