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Dear Phi, You wrote: >Dear Dave, > >Don't get offended! I'm not offended just mildly annoyed. >1. Yes, I did try to make a point. > (copying Jeff Bentley's style without success, I must add) Free advice (which is worth just what you pay for it) "A copy is rarely as good as the original." >2. Yes, I don't have the Handi but think having 2-digit is fine. Thank you for your opinion. Mine would be that it might be fine but if I can get something that is more accurate for less money in both the short term and the long term that makes more sense. >3. All. Thank you for your opinions. >4. Yes. Because I built mine. They work fine. I guess you meant yes you use an analyzer, while what I was trying to ask was "Do you use a Handi." I wasn't clear in my question? What you are saying is that you have chosen not to/or don't use a Handi. >Think about this for a minute... Assuming you want max PO2 of 1.2, 11.5% >would let you go down to 94m (308ft). If you have 12.5%, PPO2 at 94m would >be 1.3 > >Is it a big deal ? I don't think it is, and it would be even less important >when you mix higher O2% for Nitrox and deco gas. I've got no problem with this other than you could have said it in your first post instead of what you did. >They were rhetorical questions as I knew the sensor accuracy. All of them >are about 2-3% off *full-scale*. Do you understand what that mean ? :-) > >I used to use the voltmeter/calculator method for a long while and it is >fine even now. The only reason I built the meters was the chance to learn >some electronics. Yes, I understand. I knew the electronics, I built mine because I could and to limit equipment/procedures at the dive site. >I don't mix even 1/100th of the amount the WKPP guys do, but enough to not >worry about the decimal places on my trimix. If you use a good pressure >gauge and correct fill rate, you shouldn't be surprised when reading your >analyzer. >This reminds me of people who PP blend to the exact single-digit, or deco >to >the exact second, or uses Helium analyzer... You seem to be jumping to the conclusion that because I would choose to buy a piece of equipment that has a greater accuracy level while costing less, then I must have a Helium analyzer, mix to the nearest 100th of a percent and deco to the exact second. You are wrong. I take care in what I do but am not paranoid. Again, if I can get something that is more accurate & it cost less why wouldn't you do that. You and I both did. If someone else wants to use a Handi they are free to do so. What this came out of was my clarification to Paul (who commented that a boat he had been on, had less than positive experiences with the Handi) that I was misunderstood and was not recommending the Handi, but rather the company's BC adapter to regulate flow. >I wasn't really trying to pick a fight with you, but now you sound pretty >obnoxious :-) Then I misunderstood your tone and intent. You are certainly entitled to your opinion, but please note: "Opinions are like armpits, everyone has a couple and they all stink." My opinion would be: "You are not without value. You can always serve as a bad example." Dave Dalton >-----Original Message----- >From: David Dalton [mailto:david_dalton@ho*.co*] >Sent: Wednesday, August 16, 2000 3:40 PM >To: phi@sk*.be*; david_dalton@ho*.co*; Bakalite@ba*.co*; >dmdalton@qu*.ne*; Art.Paltz@R2*.CO*; 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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