conductivity and dissolved oxygen probes

[aliyesami]

can anyone give me some information about these ? I am building my own monitoring circuit and i just need a salinity/conductivity and dissolved oxgen probe that i can interface with my micro.

thanks

 

[Randy Holmes-Farley Verified Community Expert]

What do you want to know about them?

Conductivity can be complex as it is a relatively high frequency AC current needed, and the best probes have 4 electrodes.

I discuss such measurements here:

http://web.archive.org/web/20090217...iumfish.com/aquariumfish/detail.aspx?aid=1804

and discuss standards for them here:

Reef Aquarium Salinity: Homemade Calibration Standards by Randy Holmes-Farley - Reefkeeping.com
http://reefkeeping.com/issues/2004-06/rhf/index.htm

Eric discusses O2 measurements here:

http://reefkeeping.com/issues/2005-07/eb/index.htm

 

[aliyesami]

What do you want to know about them?

Conductivity can be complex as it is a relatively high frequency AC current needed, and the best probes have 4 electrodes.

I discuss such measurements here:

http://web.archive.org/web/20090217...iumfish.com/aquariumfish/detail.aspx?aid=1804

and discuss standards for them here:

Reef Aquarium Salinity: Homemade Calibration Standards by Randy Holmes-Farley - Reefkeeping.com
http://reefkeeping.com/issues/2004-06/rhf/index.htm

Eric discusses O2 measurements here:

http://reefkeeping.com/issues/2005-07/eb/index.htm

very useful info learned a lot .
I have already interfaced a PH probe successfully ,but I am unable to find these salinity or dissolved oxygen probes which are for general use and not tied to some specific meter .
can some one point me out to where i can but these probes to use with my design?

thanks

 

[mb165]

Atlas scientific has conductivity probes for arduino/raspberry pi

 

[aliyesami]

Atlas scientific has conductivity probes for arduino/raspberry pi

thanks
looks like they are selling the probes with their own meter circuit board, i can but it as a package but I want to make my own circuit. would they be willing to give me the techincal interface info for their probes?

 

[Randy Holmes-Farley Verified Community Expert]

Conductivity probes are not as standardized as pH and ORP probes, or Ion Selective Electrodes are. The simple fact that conductivity probes have variable numbers of electrodes and electrode surface area and spacing between the electrodes, as well as a built in temperature sensor (for temperature correction of the conductivity) that might be of different types is a strong reason why.

 

[cypho]

Check out this. http://sparkyswidgets.com/shop/

He also has great info about his chips which as far as I can tell are directly compatible with the Atlas's and Reef Angel's probes and would be compatible with any other probes if you change the connector on the end.

https://www.sparkyswidgets.com/portfolio-item/isolated-ec-interface/
https://www.sparkyswidgets.com/portfolio-item/miniec-i2c-ec-interface/