Conductivity sensor

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#1 21661515 20 Mar 2012 12:17

Popescu Daniel Popescu Daniel

Anonymous

Post #1
21661515 20 Mar 2012 12:17

I need to build a sensor to mesure water conductivity. The conductivity sensor is for a DAQ whit a serial port RS232 and output 4-20 mA. Can anyone help !

Thanks!!!
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#2 21661516 20 Mar 2012 17:45

Todd Hayden Todd Hayden

Anonymous

Post #2
21661516 20 Mar 2012 17:45

Design obviously depends on the range of measurement and accuracy required. Where are you stuck in the design, what have you figured out already? Have a block diagram of your design yet?
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#3 21661517 21 Mar 2012 12:04

Ben Barker Ben Barker

Anonymous

Post #3
21661517 21 Mar 2012 12:04

There is a lot that goes into building a conductivity sensor such as surface areas and cell constants. If you are only using 1 sensor, I would recommend you simply purchase one off the shelf and spend the time designing the circuitry. Sensorex is a good name when it comes to conductivity sensors.
#4 21661518 21 Mar 2012 12:12

Popescu Daniel Popescu Daniel

Anonymous

Post #4
21661518 21 Mar 2012 12:12

No I don't have any block digram. I have to star from zero
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#5 21661519 21 Mar 2012 12:18

Popescu Daniel Popescu Daniel

Anonymous

Post #5
21661519 21 Mar 2012 12:18

I have to buil one for a project. It wiil by good if help me whit some information about the areas of cell and constants.
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#6 21661520 21 Mar 2012 12:22

Ben Barker Ben Barker

Anonymous

Post #6
21661520 21 Mar 2012 12:22

are you looking for materials to use in the sensors or are you stuck on how to calculate the surface area cell constant? For materials, any metal will work (stainless steel, graphite, copper, titanium etc.). Calculating the surface area to get your cell constant is going to be the difficult part with the geometry that goes into it. Once you have the cell constant, you can work on your circuit design.
#7 21661521 21 Mar 2012 13:47

Popescu Daniel Popescu Daniel

Anonymous

Post #7
21661521 21 Mar 2012 13:47

OK I understand. You have an idea about design the circuit? A link or something
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