Re: [PSUBS-MAILIST] O2 sensors

[Al Secor <wreckdiver@usadatanet.net>]

Pierre,

O2 sensors measure partial pressure of O2, so if your sub cabin is at 2 atm, the
sensor will read .42 in air (assuming it's been calibrated to .21 at 1 atm). 
Be aware that condensation on the face of the sensor can lead to erroneous
readings so you want to try to avoid condensation directly on the face even
though some are manufactured with hydrophobic membranes.

A good place to get sensors is from Patrick at oxycheq.com.  His prices are very
reasonable and he provides good service.  (I have no relation to Patrick, just
a satisfied customer).  I use Teledyne R-22D sensors in my homebuilt
rebreather.  A very simple O2 meter can be built from a recalibrated DVM
module.  There are several sources on the web that describe how to do it and I
think Patrick's webpage also describes it.

Hope this helps.

Al

Al Secor  ARS: WA3PWX  Scuba Instructor SSI PDIC TDI
http://www.geocities.com/SubDiverI



Quoting Marie-Andrée et Pierre <poulin.carrier@videotron.ca>:

> Hi guys,
> 
> After seing Jon's presentation at the convention I decided to go with a 
> scrubber and a O2 injection device.
> 
> My question is: Will an oxygen sensor work for a dry-ambient sub? How does 
> the sensor work? I know it give a different voltage outpout depending on the
> 
> amount of oxygen in the air. but what happened when put under pressure? Will
> 
> it track PPM of oxygen in the air or the % of oxygen in the air? Will it 
> detect 21% at 1atm, 42% at 2atm, 176% at 5atm, etc...
> 
> Does anybody here have experience with a scrubber/O2 system in an ambient 
> sub?
> 
> The reason I decided to go scrubber/O2 is that I have about 35-40 minutes 
> inside my sub before I feel the effect of too much CO2 in the cabine. If I 
> refresh the air inside the cabine by injecting fresh air from my tanks, it 
> is not very effective and takes alot of air.
> 
> Thank you all!
> 
> Pierre "O2" Poulin
> 
> 
> 
> 
> 
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