[PSUBS-MAILIST] FW: O2 and CO2 sensors

[Jon Wallace via Personal_Submersibles]

 Hi Alan,
For sure they are a bit upscale in terms of price however CO2 readings are sensitive to temp and relative humidity...O2 readings are sensitive to pressure and temperature.  The units I opted for include those additional sensors internally and factor them into the output automatically, which was important to me for accuracy.  Given that they both have a greater than 5 year life span, the amortized cost is around $50/year which I found acceptable.
Jon

    On Tuesday, October 24, 2023 at 02:56:41 PM EDT, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Wow, that's expensive at US $259-There are a few options on Ali Express that are 0-5000ppmfor around N.Z. $20- that have good reviews. However I am not an expert and wouldnt know if they are good quality. They are compatible with Arduino etc. You could buy 3 at that price & compare the readings to indicate when they fail. Have a spare one to just unplug and replace.Alan


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  On Wed, 25 Oct 2023 at 2:07 am, Jon Wallace via Personal_Submersibles<personal_submersibles at psubs.org> wrote:   _______________________________________________
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