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If your interested in the spec's for Greg Zambeck's FFm gas switching system it's in the techdiver archives listed under my name. We posted it several years ago. Curt >The most sophisticated FFM gas switching rig I've seen is Greg Zambeck's >(shown in a photo in Deep Tech #2). In addition to two 2nd stages fitted >onto an aga mask, he's come up with a safe, redundant switching scheme. > >For use with an exo, i've appropriated some similar ideas. A stainless or >brass sched. 80 T or X with 1/4 - 3/8 npt thread makes an excellent block. >Ball valves switch reliably--but perhaps too easily. For this reason, all >gas switching should be done with deso (double end shut-off) quick >connects--as used for bail out bottles for hose diving. with the block >in front (and in view), all gas switches are as deliberate as swapping a >regulator into your mouth from a new stage. All connects should be tagged >for MOD. > >A valve can still be useful as a back-up to switch between 1st >stages on back (bottom) gas for redundancy, but they should not be used >for gas switching due to the probability of mix-up, leak-thru, or >accidental switch. > >As back-up, a mask (worn on neck) and regs. should be available for all >stages. A deso can be placed in-line in a conventional regulator >hose to allow snapping the 2nd stage onto different stages. you can keep the >2nd stage snapped in or in a hip pocket. Make sure your deso is rated for >a flow of Cv > 0.5 for deep dives. > >You can buy hoses and fittings from outfits like DECA in santa barbara >or Amron in San Diego. > >Ultra techie it is...but bailing the ffm for deco (or using the ffm >exclusively for deco) is unsatisfactory in many instances. > >regards, em > >_____________________________________________________________.sig >Eric Maiken email: eapg243@ea*.oa*.uc*.ed* >Dept. of Physics o: 714 824-6621 >U of California fax: 714 824 2175 >Irvine, CA 92715-4575 > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. Curt W. Smitka Phone: (313) 747-0252 Administrative Manager Fax: (313) 936-8620 Reproductive Sciences Program Email: cwsmitka@um*.ed* University of Michigan 1109 300 North Ingalls Bldg Ann Arbor, MI 48109-0404
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