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Date: Wed, 6 Mar 96 19:26 PST
To: techdiver@terra.net
From: seasport_scuba@su*.ne* (Bill Brooks)
Subject: Re: hyperbaric use of Miniox / Teledyne

>Does your CO2 absorbent (Sofnolime?) tend to absorb moisture like desicant?
>If not, have you considered adding some type of moisure absorber either to
>the scrubber, or a seperate unit?
>
>I know it wouldn't help in the case of a flooded loop, but it may
>extend the life of you sensors, and keep them stable while you're
>using them.
>
>Stephen Galperin

Hi

Sofnolime does tend to absorb moisture from the breathing loop but this does
NOT impair the CO2 absorbing properties.  The amount of CO2 that the
material is able to absorb actually increases with moisture content.
Problems begin to arise when the moisture content gets so high that the
scrubber material begins to clump (looks like used kitty litter) and impede
gas flow.  

I asked the manufacturer about trying to reduce the moisture content with
dessicant ( dry paper towels) in partially used sofnolime in  order to
prevent clumping and was told that moisture content is critical and you
should not try to reduce it.

I would be interested in any opinions that any one may have differing info.

Bill

ps   I am coming to believe that a large part of the fluctuations that
people see with moisture and sensors is due to the evaporative cooling when
ultra dry tank gas is passed over the sensor containing liquid water.  In a
breathing loop at virtually 100%RH this should not occur.

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