[PSUBS-MAILIST] scrubber performance

[River Dolfi via Personal_Submersibles]

I did side-by-side tests on several low-cost ambient CO2 sensors when I was
doing air quality instrumentation work, and I eventually settled on these
units from COZIR.
http://www.co2meter.com/products/cozir-0-2-co2-sensor

They're only about $70US, have built in self calibration, super reliable,
and have very low current draw compared to other sensors. The big rub is
that it isn't analog output, but serial.

You would have to interface it with a microcontroller (which is an easy
enough job with a $20 Arduino) and have it set up to display to an LCD,
trip an alarm at critical levels, possible demand control of the scrubber,
other sensors, etc.

I have an identical system built for the health department currently
running 70 (70!!!) of these sensors and others on battery power across the
city in the elements. They are that good.

I recently found about half of a medical scrubber in a dumpster, so I've
been thinking about life support lately.
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