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To: TechDiver <techdiver@opal.com>
Subject: Re: O2 analyzer question
From: Richard Pyle <deepreef@bi*.bi*.Ha*.Or*>
Date: Thu, 4 May 1995 15:02:01 +22305714 (HST)
On Thu, 4 May 1995 giii01@In*.Co* wrote:

> You probably already
> know this, but if you buy the little conector
> from radio shack and hook it to your multimeter,
> you can calculate the %O2 based on the number
> of millivolts the sensor outputs realtive to what
> it does in air.

Yes this works, but as with an O2 analyzer, you have to make sure you
calibrate to air before analyzing any mix.  When they're brand new, the
sensors I use put out about 12.1 - 12.6 mV when exposed to 21% O2 at 1 ATA. 
After about 6 months to a year of heavy use, they drop to about 8-9 mV.
This needs to be taken into account when you analyze your gas.

Aloha,
Rich

Richard Pyle
deepreef@bi*.bi*.ha*.or*
*******************************************************************
"WHATEVER happens to you when you willingly go underwater is
COMPLETELY and ENTIRELY your own responsibility! If you cannot
accept this responsibility, stay out of the water!"
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