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Art, Looks like a nice unit. At that price it hardly pays to make your own! Dave Dalton >From: Art.Paltz@R2*.CO* >To: techdiver@aquanaut.com, cavers@ca*.co* >Subject: RE: "OMS Like" DIN flow regulator >Date: Wed, 16 Aug 2000 10:06:59 -0400 > >Since I started this thread I'll jump in. I looked at the Handi analyzer >but decided against it. The sensor that is used lists from their web site >that the sensor is accurate plus or minus 3%, that was on consideration. >The fact that it didn't have a decimal point wasn't a factor cause any >sensor is not going to be perfect unless brand new and under controlled >laboratory conditions (and then I still doubt it). One other reason was >the >cost. I was able to get an RC Technology unit for less money and it's not >disposable. It can use a variety of sensors including the Ceremtec. If >you >want to specifically use the MAX 250E I think you'd just have to make up an >adapter plug (just like if you wanted to use a MiniOx sensor). The RC tech >unit cost me $179 with sensor and plastic "tee" and was at my doorstep in >about 3 business days. Their web site is http://world.std.com/~rcdtech/ ><http://world.std.com/~rcdtech/> > >I'm pretty sure it's modeled after the one in the Vance's hackers hand >guide. > >Art. > > > -----Original Message----- > From: David Dalton [SMTP:david_dalton@ho*.co*] > Sent: Wednesday, August 16, 2000 9:40 AM > To: phi@sk*.be*; david_dalton@ho*.co*; >Bakalite@ba*.co*; dmdalton@qu*.ne*; Paltz, Art; >techdiver@aquanaut.com; cavers@ca*.co* > Subject: RE: "OMS Like" DIN flow regulator > > "Phi Le" wrote: > > >Dave, > > > >Assuming this is 2-digit and no decimal places, that should cover >the range > >from 00 to 99 for O2. > > > >How accurate do you need your mix to be ? And do you know how >accurate your > >sensor is ? :-) > > > >-Phi > > > Dear Phi, > > A few questions and then the answers you asked for: > > If I misunderstood your tone/intent my appologies but > > Did you have a point you were trying to make? > Do you think the Handi is a suitable unit for all O2 analyzing >tasks? > If not all, which ones do you think it is good for? > Do you use one? Why did you decide on it? How has it worked out for >you? > > Your questions seem to want to start an argument as opposed to >seeking > knowledge. 2 minutes on their web site would have told you the >acuracy of > the Handi & the MAX 250-E. > > > The following are the reasons I chose not to use a Handi O2 >analyzer: > > 1 ) In-my-never-to-be-humble-opinion 2 digit display is fine for > recreational nitrox. For a low O2% trimix it might not be. As I am >just > starting to mix I would say others (George, JJ, Jess, Scott) on >these list > could address the usefulness of this unit in those applications far >better > than I, and I defer to them. > > 2) A 2 digit display could introduce an additional error of as much >as 1% > (11.5%-12.5% displayed as 12%, you wanted 11.5%, you tested and got >12% so > you think you are close but you really got 12.5% so you are off by >1.0% > rather than 0.5%). > > 3) The unit itself is accurate +/- 3% full scale over operational > temperature range (as listed on their site) > > 4) The MAX 250 E is accurate +/- 2% of full scale (as listed on >thier site) > > 5) Combining 2 & 3 above I would deduce that you are looking at a >unit to > unit accuracy level of 2% vs 4%. > > 6) The Handi cost about $230 with the fittings that started this >thread. > > 7) I just built my own and it cost $136.50 including the sensor + >fittings - > Oh, I almost forgot I bought my computer geek a Mountain Dew @ $1.04 >to > modify the panel meter for me - at 52 the eyes don't like close work >and the > hands are no longer suitable for conducting brain surgery. > > 8) In 2 to 4 years when my sensor "cashes in it's chips" it will >cost me $65 > for a new one instead of $200 for a new Handi-dandy (and I hate >throwing > away the "car just because it needs new sparkplugs"). > > 9) If I was as cheap as MOST divers, I could have just used my Radio >Shack > Digital Multi Meter (which I bought for $39.95 a number of years >ago) and a > $5 calculator in concert with the MAX 250. That way my expenditures >would > have only been about $95 for the MAX 250 and fittings or $65 if I >skipped > the fittings. > > Please excuse any errors. I am new to diving, I didn't start until >1962 :-). > > Dave Dalton > > > > > > >-----Original Message----- > >From: David Dalton [mailto:david_dalton@ho*.co*] > >Sent: Tuesday, August 15, 2000 5:52 PM > >To: Bakalite@ba*.co*; dmdalton@qu*.ne*; Art.Paltz@R2*.CO*; > >techdiver@aquanaut.com; cavers@ca*.co* > >Subject: Re: "OMS Like" DIN flow regulator > > > > > >Paul, > > > >I guess I was unclear in what I posted. I wouldn't recommend the >Handi > >analyzer, since it's use is limited with only a 2 digit display, >but their > >BC adapter and barbed adapter will work with their medical & >industrial > >sensors such as the MAX 250E. > > > >Dave > > > > >________________________________________________________________________ > Get Your Private, Free E-mail from MSN Hotmail at >http://www.hotmail.com > ________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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