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--------------071F7B440E10C4AAA0C7B240 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Jim, It is the same meter, but they have changed the format of the board and are now using the smaller rectangular resistors as opposed to the more commonly cylinder shaped, color coded ones. With the older version of the PM128, the O2 Hacker requires you to remove the blue resistor to the left of the pot. With the new version of the PM128, you remove the "R3" resistor which is to the right of the existing pot. The rest of the directions in the O2 Hacker remain the same. The trick to removing the new surface mounted resistors is to beat up one side and then quickly heat up the other side and "flick" it off the board. They are quite small, so putting it back on will certainly take more patience. Patrick =============== > Thanks, Bob, I have updated the web site to reflect this information. > > Jim > ------------------------------------------------------------------- > Learn About Trimix at http://www.cisatlantic.com/trimix/ > > > From: "Robert G. Rowlette" > > Date: Thu, 24 Feb 2000 12:43:19 -0500 > > To: "Chris Elmore" > > Cc: > > Subject: Re: O2 analyzer circuit board change. > > > > You evidently have a PM128A, not the orginal PM128 panel mount LCD > > millivolt meter that is specified in the article on Jim Cobb's web site. > > The PM128A uses surface mount devices (SMDs) which are extemely > minatuture > > and really not easily changed. As recently as last November, I purchased > an > > original PM128 - not A - from Parts Express in Dayton, OH. Check the PE > web > > site @ ; they may still have some non-A > > PM128s left. Also, if I'm not mistaken, the newest version of Vance > > Harlow's "The Oxygen Hacker's Companion" deals with this issue. > > > > Good luck. > > > > Bob > > > > At 11:48 AM 2/24/2000 -0500, you wrote: > >> The plans on Jim Cobb's website > > for making an > O2 > > analyzer call for a PM128 circuit board. A new circuit board has replaced > > the one illustrated on the website but the layout of the new one is > > completely different than the older one. I tried to contact Jim Owens > (who > > wrote the article) but my email bounced. If anyone knows how to reach him > > or configure the new CB I'd really like to hear from them. Until this > gets > > figured out I'd caution people from buying the PM128 to make an O2 > analyzer. > >> Thanks, > >> C. > >> > >> > >> Chris Elmore > >> College of Liberal Arts > >> Univ. of SC > >> (803) 777-1534 office > >> (803) 348-3055 mobile > >> Please use this address for all email: chris@sc*.ed* > --------------071F7B440E10C4AAA0C7B240 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> Jim, <p>It is the same meter, but they have changed the format of the board and are now using the smaller rectangular resistors as opposed to the more commonly cylinder shaped, color coded ones. <p>With the older version of the PM128, the O2 Hacker requires you to remove the blue resistor to the left of the pot. With the new version of the PM128, you remove the "R3" resistor which is to the right of the existing pot. The rest of the directions in the O2 Hacker remain the same. <p>The trick to removing the new surface mounted resistors is to beat up one side and then quickly heat up the other side and "flick" it off the board. They are quite small, so putting it back on will certainly take more patience. <p>Patrick <br> <p>=============== <blockquote TYPE=CITE> <pre>Thanks, Bob, I have updated the web site to reflect this information. Jim ------------------------------------------------------------------- Learn About Trimix at <A HREF="http://www.cisatlantic.com/trimix/">http://www.cisatlantic.com/trimix/< /A> > From: "Robert G. Rowlette" <robgrow@on*.ne*> > Date: Thu, 24 Feb 2000 12:43:19 -0500 > To: "Chris Elmore" <ElmoreC@gw*.sc*.ed*> > Cc: <techdiver@aquanaut.com> > Subject: Re: O2 analyzer circuit board change. > > You evidently have a PM128A, not the orginal PM128 panel mount LCD > millivolt meter that is specified in the article on Jim Cobb's web site. > The PM128A uses surface mount devices (SMDs) which are extemely minatuture > and really not easily changed. As recently as last November, I purchased an > original PM128 - not A - from Parts Express in Dayton, OH. Check the PE web > site @ <http://www.partsexpress.com/>; they may still have some non-A > PM128s left. Also, if I'm not mistaken, the newest version of Vance > Harlow's "The Oxygen Hacker's Companion" deals with this issue. > > Good luck. > > Bob > > At 11:48 AM 2/24/2000 -0500, you wrote: >> The plans on Jim Cobb's website > <http://www.cisatlantic.com/trimix/Analyzer/analyzer.htm> for making an O2 > analyzer call for a PM128 circuit board. A new circuit board has replaced > the one illustrated on the website but the layout of the new one is > completely different than the older one. I tried to contact Jim Owens (who > wrote the article) but my email bounced. If anyone knows how to reach him > or configure the new CB I'd really like to hear from them. Until this gets > figured out I'd caution people from buying the PM128 to make an O2 analyzer. >> Thanks, >> C. >> >> >> Chris Elmore >> College of Liberal Arts >> Univ. of SC >> (803) 777-1534 office >> (803) 348-3055 mobile >> Please use this address for all email: chris@sc*.ed*</pre> </blockquote> </html> --------------071F7B440E10C4AAA0C7B240-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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