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from the Can I get some here department...
Non-Linear Signal
Continuous process industries, DCS questions. topic
Posted by AJ on 3 October, 2003 - 12:36 pm
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.


Posted 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
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Posted 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


Posted by BobB on 5 October, 2003 - 7:00 pm
This is exactly what a thermocouple transmitter does. If you have a plot, a transmitter company should be able to make one for you.


Posted 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.

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