[PSUBS-MAILIST] DIY CO2 monitors

[Jon Wallace via Personal_Submersibles]

 For what it's worth, I have been monitoring CO2 in my house with my SEM analyzer and I'm averaging 2000ppm throughout the day.  This is in Florida so the windows and doors are always closed relying on AC.
Also worth noting is Steve McQueen's results in his K-250 without life support.  He reached 5000ppm at 14 minutes duration, 10000ppm at 30 minutes duration.  Note that these results were "at rest".


    On Friday, October 29, 2021, 10:47:45 AM EDT, Cliff Redus via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Actually this sensor looks pretty good. Gets humidly and temperature  as well. 3% accuracy is a bit weak.  Worth considering. 

Sent from my iPhone

On Oct 29, 2021, at 8:44 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:



 Thanks for the tip.  The Sensirion SCD30 costs about $60 compared to the GSS Cozir I have been using at $109.  Specifications from datasheet look similar although the SCD30 shows a lifetime of 15 years compared to COZIR which shows 5 years.  Big advantage if true, but we better get one going soon because a lot of us aren't going to be around, or will be in our own la-la land, by 2036 when it comes time to see if it's still working accurately.  Great selling point for us senior members..."the last CO2 sensor you'll ever need!"   :)   :)  
Jon

    On Thursday, October 28, 2021, 07:41:02 PM EDT, Michael Holt via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
   In the  current issue of MAKE magazine, there's an article called "Fresh Air."  Instructions for making several different monitor start on page 24.  One of them is small enough to fit into a large finger ring.  I've not done anything like that for 40 years, so I'm not going to think about evaluating it.
 
 The article is "ROBO-BOAT."  That's about an autonomous boat.
 
 $14.99, so it's a bit expensive for a magazine. 
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