Our sensor uses open source hardware (Arduino) to measure the electrochemical response of 8 metals referenced to Zinc, and ocean temperature
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Currently we calibrate like Silver Chloride pH sensors. We get pH adjusted seawater (using HCL and NaOH) and do an interpolation, using a Nernst equation to compensate for temperature. I think we might have to do a much better job and consider salinity and degradation over time due to fouling to really get the best out of this type of sensor. Its main advantage is it is very robust physically.
Makes sense. I do a bit of work with process pH measurement, and hitting the right balance of durability, accuracy, and stability is a real challenge. You might want to look at retractable housing designs--there are a few out there that can pull the probe into a flushing chamber to clean out reference junctions. You could probably design your own that would extend the life of your sensor by a bit.
We are Blue Devil Ocean Engineering. I Added the ATtiny85 code.
This MEGA code is actually older code, but it works fine. We have a new version that works on an UNO and on a Yun, still in debug.
Your ATtiny85 Code link seems to be missing the URL.
Also, which team are you?
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Hi--how do you handle probe calibration?