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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 -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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