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Rdediver@ao*.co* wrote: > > >don't use Scubapro or Dacor in cold water.......I haven't tried the > Zeagle.....< > > OK wise guy, the question was directed to second stage regulators, in cold > water isn't it normally the first stage that has the freezing problem which > causes the Intermediate pressure to increase and blow by the seat of the > second stage?? If you just want to pick on someone, get your facts straight, > address the question and then make an ass of yourself. Maybe even offer > something constructive such as which regulator you would recommend. > > The Scubapro G250 second stage regulator works fine in cold water by the way. In my experience (I do have some) _most_ freeze ups are second stages and usually caused by the user not knowing to keep his second stage dry until just entering the water. First stage problems are much more dangerous, and therefore it is good that they are rarer. Typically the intermediate pressure goes out of regulation and puts very high pressure on the second stage and inflator hoses. This can cause problems with BCs inflating and dry suits inflating uncontrollably, with obvious results. I have seen many, many regulators freeze up in cold water. Through the ice in lakes is normally about 37 degrees here in Michigan. Rivers in the winter can be as cold as 30 degrees or so. I have never had a properly maintained scubapro freeze up, nor have I ever had ANY Poseidon freeze up. I have seen Sherwood Blizards freeze up on the first stage. The guy who had that happen to him was injured due to the freeze up. I would emphasize that proper maintenance and procedures when diving cold water are probably more important than the specific brand of regulator. Scubapro "cold water prepares" their first stages by packing them with silicon. They call it SPEC (acronym for something). It is a pain in the ass for repair technicians to clean out during normal annual rebuilding. One tech told me it probably costs him an additional 20 minutes just for that. The Poseidon Odin has a rubber cap that is filled with Isopropyl Alcohol to isolate the innards from surrounding water. I find that preferable. -- Dave Mabry dmabry@mi*.co* Great Lakes Maritime Institute Underwater Research Team
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