Re: [DIYbio] Building an incubator, would like some opinions/help

On Fri, Jan 4, 2013 at 7:07 PM, John Griessen <john@industromatic.com> wrote:
> It's a dual wavelength discriminator...a complex optical assembly in other
> words...
>
> So, how about an O2 sensor instead? Could you do that?
>

the only O2 sensors I know of are in my automobiles' tailpipes, and
they need high temp to get working. Car's have a 3-wire version that
includes its own heater circuit, look's like they're around $40 and
need 600 F + temps (the 1-wire non-self-heating are $16 but still need
to get hot somehow)

actually i just found this for $184
http://www.grainger.com/Grainger/MSA-Replacement-Sensor-2TEX8?BaseItem=2TEY8

The bioBoard project at noisebridge tried their hand at making a
dissolved oxygen probe (optode), that the oxygen sensor wikipedia
article leads me to believe would also work for air
https://www.noisebridge.net/wiki/BioBoard#Dissolved_oxygen_.28DO.29_probes

wikipedia also mentions galvanic oxygen sensors
http://en.wikipedia.org/wiki/Oxygen_sensor#Scientific_applications


BUT, I think an O2 sensor could be complementary to a CO2...
substituting would depend on the case as well as price

Here's a quick CO2 blurb
http://wiki.answers.com/Q/What_is_the_role_of_carbon_dioxide_in_mammalian_cell_culture

Then there's Nitrogen too...

hydrogen looks cheap and easy at $7.95 (the L.A. biohackers were
trying to grow some extremophile in hydrogen I think)
https://www.sparkfun.com/products/10916

ahh but it looks like it isn't temperature compensated, though it
includes a heater on-sensor
http://wiki.biohackers.la/Nitrogenase_Directed_Evolution#Bioreactor_Setup

that's the same problem with the $19 CO2 electrolytic sensor they're
using (which is why i figured a 3X price increase was worth not
screwing with compensation):
http://www.futurlec.com/Gas_Sensors.shtml

--
-Nathan

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