Conductivity measurement

[Sfase]

Hello,

I need to measure the conductivity of a fluid via two metal pins we have.

As we have cRIO systems it would be nice to have a module for in this cRIO (i also want to steer some actuators with this system) that can measure this.

Any idea's how to perform this measurement or where i can find already available information? (i could not find it yet)

Thank you in advance,

[nanocyte]

If a measurement of DC resistance is OK, this module can measure resistance. Conductivity would be 1/resistance.

http://www.ni.com/pdf/manuals/374473a_02.pdf

If you need an changing signal to avoid capacitive effects, I don't know of any modules where you can measure EC directly. You might be able to generate your stimulus and measure current over a sense resistor with something like this:

http://www.ni.com/en-us/support/model.ni-9381.html

Otherwise, you'll have to find an off the shelf probe/conditioner that can output SPI,I2C, or a voltage.

[Sfase]

Thank you for you reply.

Unfortunately i cannot use the DC resistance for measurement.

It seems that i need to extract the values from dedicated PCB's we use in our product. I still need to dig into that PCB to find the right signal.