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4w at 24v ac/dc thats 166ma continuous draw @24v, thats been one of the big issue too much power..
even if you used double lithium cells like cameras use (they are 6v) that would be 4 batteries at about $10 a piece.. most are rated at 1200mah so thats 7.25hrs for $40 just to make a reasonably small pack (probably the size of a pack of cigarettes). sure you can move to rechargeables but now you'll be carrying a pack the sise of a cannister light.
Plus its 15 minutes for full accuracy.. and for 63% of sacle its around 30 seconds... if your co2 is climbing by the time the alarm sounds it may be too late.. co2 events happen FAST.
Plus the key phrase "non-condensing" this immediately precludes a rebreather.
the type of sensor that as pointed to works by light absorption.. a laser generates a light of a specific wavelength then a tuned sensor measures the received light and the amount of loss is determined.. my GUESS is that it actually is relaying PCO2 since we will assume 1(pressure ata) at the surface so surface po2 = percentage, but at depth this isn't tru.. since under greater pressure the density increases, so does the number of co2 molecules, this should decrease the amount of light penetrating..
Yes, this is how the cheap (ie $40) green house detectors work. unfortunately water vapour attenuates the light even faster so its no use in condensing 100% humidity. Been tried lots of times
The way forward is to use the solubility of the Co2 in a base liquid and measure the PH change. You need to arrange a constant cycle though or else your water saturates
The Inspiration has "The most efficient Scrubber ever seen" according to DERA witha near 100% usage before breakthrough. Monitoring the temprature rise through the stack (there is a heat front where the absorbant is active) will let you know where the active front is and as it approaches the top you know its near its end. This is the better approach but it wont spot breakthroughs and some stupid sods will use the scrubber until 5mm of stuff remains at the top cos the meter says so