I was thinking about using a CO2 gas meter to measure the CO2 gas content inside the inverted chamber like the drop checker, just larger. Place a gas analyzer probe in this, and read(you need to convert the Gas into liquid ppm- about 72:1 last I checked bubbling 1800ppm air + gas into water to get 25ppm dissolved, I could be wrong, but that seemed right back then).
This removes one boundary layer, and it can use IR method for CO2, which does not wear out etc and can easily be calibrated. Gas detectors are pretty common for CO2 and somewhat cheap.
Still, several hundred bucks
Since there's the conversion, the accuracy of 50ppm in the air is about less than 1 ppm in water.
At least this is how I think it might work.
You still have to equilibrate the air in the drop checker with that of the water.
There's also another neat, very accurate method I'm looking at.
See other thread with micro probes.
Regards,
Tom Barr
This removes one boundary layer, and it can use IR method for CO2, which does not wear out etc and can easily be calibrated. Gas detectors are pretty common for CO2 and somewhat cheap.
Still, several hundred bucks
Since there's the conversion, the accuracy of 50ppm in the air is about less than 1 ppm in water.
At least this is how I think it might work.
You still have to equilibrate the air in the drop checker with that of the water.
There's also another neat, very accurate method I'm looking at.
See other thread with micro probes.
Regards,
Tom Barr