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Stan >Thanks for the description David. Most who don't dive cold have recommended >the non-sealed. Why is this the case given the internals are so similar? >More compact? Fewer parts? Yes, basically the first stage is a tad smaller and lacks the environmental seal. They are really elegant looking regulators. > Less failure prone? As discussed, the only difference is the environmental seal which, if it fails, is not a problem. > My diving will be mostly >saltwater, non-cold. The US4 will be fine, if you feel the need for a DS4, this will be fine too. But why pay for what is not needed? >At what water temp does freezing become a concern? I am not qualified to answer this. I can say that I am happy and dive in 4 deg C water with my US4s. (Happy but sometimes cold!) In Europe, the regulator design undergoes certain tests to get an EC approval, and these are valid down to 10 Deg C. I don't know if this also applies to the DS4. In summary you'll be happy with either US4 or DS4. I would still buy the US4. This leaves the isolator area and place where the convoluted hose enters the wing cleaner. David Shimell shimell@se*.co* <mailto:shimell@se*.co*> DDI: 01932 814096 * Mobile: 07770 282 202 * Fax: 01932 814343 Project Manager, IBM UK Web Server Group, Sequent Computer Systems Ltd, Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK registered in England and Wales under company number: 1999363, registered office as above -----Original Message----- From: Stan Dilcher [SMTP:divewrecks@ho*.co*] Sent: Wednesday, May 31, 2000 2:42 AM To: shimell@se*.co*; divewrecks@ho*.co*; techdiver@aquanaut.com Subject: RE: Thanks for Apeks Info! Thanks for the description David. Most who don't dive cold have recommended the non-sealed. Why is this the case given the internals are so similar? More compact? Fewer parts? Less failure prone? My diving will be mostly saltwater, non-cold. At what water temp does freezing become a concern? Thanks again, Stan Dilcher >From: "Shimell, David (shimell)" <shimell@se*.co*> >To: Stan Dilcher <divewrecks@ho*.co*>, techdiver@aquanaut.com >Subject: RE: Thanks for Apeks Info! >Date: Tue, 30 May 2000 05:08:44 -0700 > >Stan > > >Can someone please comment on the advantages/disadvantages of sealed vs. > >non-sealed first stages (as in the Apeks models)? I'm not sure I >understand > >the difference or if one has a higher potential for failure in certain > >conditions. I don't plan on cold water diving at this point. > >The sealed version differs only in that it has a slightly longer first >stage >and what looks like a silicone environmental seal. In the event of the >seal >being damaged, water will ingress and you now have an unsealed first stage >just like a US4. Thus, an environmental seal failure will not be a >problem. > >To explain further. Inside the sealed compartment are the same innards as >a >US4 - A SS spring, screw thrust adjuster, pressure cap and diaphragm. It >is >the diaphragm that seals the remaining functional parts of the first stage >innards from water. So if you lose the environmental seal the diaphragm >provides a (second) water seal just like a US4. > >The environmental seal simply prevents water getting inside where the lack >of >water motion and well conducted cooling due to pressure drop could result >in >ice formation. I dive all year round in the UK with no problems when using >sensible precautions. I have no experience in sub 4 deg C conditions so >don't >read anything into the suitability for this sort of diving. > >David Shimell >shimell@se*.co* <mailto:shimell@se*.co*> >DDI: 01932 814096 * Mobile: 07770 282 202 * Fax: 01932 814343 >Project Manager, IBM UK Web Server Group, Sequent Computer Systems Ltd, >Weybridge Business Park, Addlestone Road, Weybridge, Surrey, KT15 2UF, UK >registered in England and Wales under company number: 1999363, registered >office as above > >-----Original Message----- >From: Stan Dilcher [SMTP:divewrecks@ho*.co*] >Sent: Sunday, May 28, 2000 8:16 PM >To: techdiver@aquanaut.com >Subject: Thanks for Apeks Info! > >Thanks to the many people who have provided information in response to the >Apeks regulator questions I posed. It looks like recommendations point to >the the US4/TX40 combo. This will be for my first doubles rig that I am >doing some advanced planning for. At present I am planning on a Scuba Pro >R380 for a backup. My main diving interest is ocean/wreck diving. > >Can someone please comment on the advantages/disadvantages of sealed vs. >non-sealed first stages (as in the Apeks models)? I'm not sure I understand >the difference or if one has a higher potential for failure in certain >conditions. I don't plan on cold water diving at this point. > >If anyone can provide any US dealer info with regards to a US4 DIN/TX40 >combo I would appreciate it. > >Thanks again to everyone who responded, >Stan Dilcher > > >________________________________________________________________________ >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'. >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.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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