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>From uunet!opal.com!owner-techdiver Mon Sep 20 13:11:16 1993 >Return-Path: <uunet!opal.com!owner-techdiver> >Received: from csfb1 by phantom.fir.fbc.com (4.1/SMI-4.1) > id AA03975; Mon, 20 Sep 93 13:11:14 EDT >Errors-To: uunet!opal.com!owner-techdiver >Received: from uunet.UUCP by csfb1 (4.1/SMI-4.1) > id AA13664; Mon, 20 Sep 93 13:11:20 EDT >Errors-To: uunet!opal.com!owner-techdiver >Received: from fulton.opal.com (via gw.opal.com) by relay2.UU.NET with SMTP > (5.61/UUNET-internet-primary) id AA04014; Mon, 20 Sep 93 12:20:49 -0400 >Received: from localhost (root@lo*) by fulton.opal.com (8.5/2.8) > id MAA24687; Mon, 20 Sep 1993 12:13:56 -0400 >Date: Mon, 20 Sep 1993 17:12:19 +0100 >From: Gordon Henderson <uunet!meiko.co.uk!gordon> >Subject: Re: Mix questions >Message-Id: <199309201612.AA27248@hu*.me*.co*.uk*> >Precedence: bulk >Errors-To: uunet!opal.com!owner-techdiver >To: techdiver@opal.com >Received: from hub.meiko.co.uk (hub.meiko.co.uk [192.131.108.80]) by fulton.opal.com (8.5/2.8) with SMTP > id MAA24671; Mon, 20 Sep 1993 12:13:51 -0400 >Received: from rigel.co.uk (rigel.meiko.co.uk) by hub.meiko.co.uk with SMTP id AA27248 > (5.65c/IDA-1.4.4 for techdiver@opal.com); Mon, 20 Sep 1993 17:12:19 +0100 >X-Sun-Charset: US-ASCII >Status: R > >Tracey Baker, <tab@go*.at*.co*> writes: >> I'm playing with some gas mixing algorithms, [-edit-] >> to get really accurate numbers for partial pressure mixing. [-edit-] >> how it's done in the real world... > >Is parial pressure mixing a good thing? > >My local shop always uses an analyser for Nitrox (and trimix, I guess) >mixes. The chap who does the mixing (currently) starts with an empty >bottle and he knows that for a final mix of X% O2, he needs to start >with Y bar of pure O2, then top it up to final pressure with air, then >analyse and cut back by emptying a little out of the bottle and topping >up with air and testing again. > >I've watched him do this fairly often - He deliberately adds a little >too much O2 so he can cut back to the exact final mix (No O2 booster >yet, but he's working on it!) > >His meter is accurate to 0.1% - I don't think that you could get that >accurate by partial pressure mixing - Or can you? Does anyone do it >this way and consistently get accurate results? > >Gordon This *is* the method of partial pressures. Wrolf
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