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Measuring the Conductivity of a solution

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Hi,

 

I'm trying to measure the conductivity of a saline solution over a period of time. However, I'm struggling on where to even begin with this. 

 

And advice is appreciated.

 

Thanks in advance,

Abby

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What hardware are you using?

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NI SCB-68A

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That is a connector block (also known as a breakout board). All it does is expose different pins as screw terminals so you can easily connect wires. You will need some more hardware to be able to do anything useful with it.

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Would that be NI PXIe-1078?

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That is a chassis which can hold different cards. The cards themselves are what determine what kinds of signals you can send and collect.

 

This paper looks like a pretty good intro to measuring conductivity. It looks like you'll need some kind of a conductivity cell for your measurement.

https://www.tau.ac.il/~chemlaba/Files/Theoryconductivity.pdf

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Would that make it NI PXIe-6363.

 

Thank you, I'll look at the paper

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Solution
Accepted by topic author anotherabby

Yes that card has a bunch of analog inputs and a couple of analog outputs. It looks like you'll want to use the an analog output to send a voltage waveform. Then you'll want to use an analog input to measure the current, but you'll need some external circuitry to do that. A common way to convert a current to a voltage (with a known gain) is a circuit called a transimpedance amplifier.

 

For the software side, you can go into LabVIEW's example finder ( help >> find examples ) and type in "daqmx". This will give you many examples of different things you can do with the DAQmx drivers which control your PXIe-6363 card.

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