Re: Oxygen sensor / Pressure sensor

From: Richard (rwskinnerATawesomenetDotnet)
Date: 09/10/04 

Date: Fri, 10 Sep 2004 06:05:43 -0500

I sure don't know of any that small. To get one that small, the life span
would be very short. Citrix sells industrial o2 sensors and so does
Grainger but they average from $75 to $300 and have a 1 year life span if
kept dry and clean.

Pressure Sensors come pretty small but for one that will read up to 5k about
the smallest I found is 1/2" diameter and about 1-1/2" tall with 1/8 NPT
threads and they run in the $100 - $250 Range.

"Vincent Himpe" <vincent_himpe@hotmail.com> wrote in message
news:Xns954D91BF48062vincentlabdvcom@195.130.132.70...
> I'm looking for sources of oxygen sensors ( 0 to 100% ) like used in gas
> analysers. I know that these exist as semiconductor devices ( real small )
>
> Want to make a nitrox analyser for scuba diving.
> Most sensors for DIY analyser i find out there are big and bulky. Can be
no
> bigger then a transistor.
>
> Second thing i'm looking for is a Pressure sensor ( Absolute pressure )
> that can withtstand at last 4000 PSI ( 350 BAR ) and has a threaded
> coupling. No strain gauge type ! has to be semiconductor or capacitive
> type.Preferrable with compensatin electronics inside. Like 0 to 5 volts is
> 0 to 5000 PSI. I don't want to deal with non linearities and temperature
> drift of these things. Motorola and Melexis make neat sensors but they
> don't go that high in pressure..
>
> Anyone know who makes the sensors used in dive computers from suunto /
> Mares / Uwatec ? That is what i am looking for. Has the right connection
> and everything.
>

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