Mailing List Archive

Mailing List: cavers

Banner Advert

Message Display

From: <Art.Paltz@R2*.CO*>
To: techdiver@aq*.co*, cavers@cavers.com
Subject: RE: "OMS Like" DIN flow regulator
Date: Wed, 16 Aug 2000 14:03:39 -0400
Kind of what made my decision.  I've already got all the stuff (minus
sensor) to build my own.  Heck, some of the stuff I've got enough to make 2
analyzers with.  I just don't have the time to do it myself so I decided to
buy one.

Art.


	-----Original Message-----
	From:	David Dalton [SMTP:david_dalton@ho*.co*]
	Sent:	Wednesday, August 16, 2000 1:58 PM
	To:	Paltz, Art; techdiver@aq*.co*; cavers@cavers.com
	Subject:	RE: "OMS Like" DIN flow regulator

	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@aq*.co*, cavers@cavers.com
	>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@aq*.co*; cavers@cavers.com
	>	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@aq*.co*; cavers@cavers.com
	>	>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

Navigate by Author: [Previous] [Next] [Author Search Index]
Navigate by Subject: [Previous] [Next] [Subject Search Index]

[Send Reply] [Send Message with New Topic]

[Search Selection] [Mailing List Home] [Home]