O2 sensor for purging kegs?

[bracconiere]

what about using something to take the guess work out of purging kegs?

https://www.ebay.com/itm/3341220225...7KiGPuhLr%2FtKdOM%3D|ampid:PL_CLK|clp:2334524
not TOO expensive?

 

[Golddiggie]

How do you plan to get the reading from inside a keg, outside (so you can get the readings)??

 

[Beerstein]

I could imagine adding a sensor in-line to a spunding valve? O2 sensors are expensive. Co2 are cheaper, I wonder if a regression curve could be built. For that matter, could you use weight Of the keg?

 

[bracconiere]

How do you plan to get the reading from inside a keg, outside (so you can get the readings)??

something like an extended PRV, that the exiting gas goes over the sensor? wait till pretty much 0% o2 detected?

I could imagine adding a sensor in-line to a spunding valve? O2 sensors are expensive. Co2 are cheaper, I wonder if a regression curve could be built. For that matter, could you use weight Of the keg?

co2, wait till it's close to 100%?

 

[sibelman]

I'm loving the impulse behind this. We do all this stuff to reduce oxygen but only measure the results by tasting the gradual staling of our beers. I'd sure like to know more exactly how effective are the various anti oxygen efforts we make.

 

[bracconiere]

various anti oxygen efforts we make.

yeah well i really just make the gesture to fit in, lol....but think it'd be cool to actually watch the purging process reducing o2...so while i'm crying watching my co2 cylinder losing co2, i know it's worth it!

 

[Beerstein]

something like an extended PRV, that the exiting gas goes over the sensor? wait till pretty much 0% o2 detected?


co2, wait till it's close to 100%?

something like that. I once attached a co2 sensor to the output of an airlock and record the bursts of co2 that came with each bubble. I vaguely recall that sensor (from Adafruit) only worked to 10000ppm.


I was just looking at the 02 sensors at SainSmart. Not sure about tHe accuracy. I suspect they don’t work well below 1% 02 mix.

 

[Beerstein]

i Found a co2 sensor that measures up to 100%. The accuracy statement is a bit confusing:

”Accuracy: ±70 ppm ± 5% of reading”

https://www.co2meter.com/products/cozir-100-percent-co2-sensor

 

[Vale71]

An instrument capable of measuring O2 levels at the PPM level costs as much as a small car. I'd say that's out of reach for 99.9999% of homebrewers...

You could actually measure purity of the CO2 coming out at the end and assume that impurities are air and therefore 21% O2. To do that you'd need something like this, which is somewhat cheaper but still expensive and the process is time consuming:

https://at2e.com/project/co2-p-co2-purity-tester/

 

[jseyfert3]

In addition to not being anywhere accurate enough at the levels that matter, that particular device the OP linked is a confined space O2 alarm. I’ve used that exact model. By default at 19.5% O2 and below it flashes red, has an audible alarm, and vibrates. Not exactly something that would be pleasant while enjoying a home brew and trying to experiment.

i Found a co2 sensor that measures up to 100%. The accuracy statement is a bit confusing:

”Accuracy: ±70 ppm ± 5% of reading”

https://www.co2meter.com/products/cozir-100-percent-co2-sensor

Stacked accuracy specs are pretty common. Atmospheric CO2 is currently at 412 ppm. So if you were measuring that your accuracy is ±70 ppm, plus 5% of the reading (what you actually measure), and 5% of 412 is 21. So your reading would actually be somewhere between 321 and 503. Not great but it’s a cheap sensor and that’s certainly good enough if you want to see how CO2 levels in a house may compare to outside or watch CO2 levels in a closed tank with plants or something like that

Now if you are trying to measure 99.9% CO2 your accuracy is 5%, so it can read 95% CO2 and still be in spec. Or you may have 95% CO2 but it’s saying you have 99.5%.