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Non-Linear Signal
Need to know of any transmitters out there that can take a 0volt to 8volt non-linear signal and convert it to a linear 4ma to 20ma signal or 0volt to 10volt linear signal.

Need to know of any transmitters out there that can take a 0volt to 8volt non-linear signal and convert it to a linear 4ma to 20ma signal or 0volt to 10volt linear signal.

By Karppi, Dan \(SudburySmelter\) on 5 October, 2003 - 5:27 pm

AJ,

Have a look at this instrument. It might be what you need.

http://www.alphacontrols.com/Inor/86DIQ00022.pdf

Dan

~~~~~~~~~~~~~~~~~~~~~~~~~~
Dan Karppi CCST III
Falconbridge Limited
Falconbridge, Ontario
Canada
P0M 1S0
~~~~~~~~~~~~~~~~~~~~~~~~~~

By Curt Wuollet on 5 October, 2003 - 6:21 pm

That would be a most interesting device for
an arbitrary non-linear signal. A PIC or
similar with an ADC a lookup table and a DAC
would probably be the closest practical thing.

Regards

cww

This is exactly what a thermocouple transmitter does. If you have a plot, a transmitter company should be able to make one for you.

By Thomas Hergenhahn on 5 October, 2003 - 7:02 pm

This cannot be answer without knowing what kind of non-linear signal you have. There are, for example, converters for the squareroot function, which occurs e.g. in flow measurement.
There are converters for the non-linear signals of every kind of thermocouples.
If your signal has some very weird non-linear chracteristic, there is allways the possibility to read it in to some analog input of a PLC, program a conversion table and deliver the result from a table lookup to an analog output.