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On Thu, 14 Mar 1996, DYER, BILL wrote:
> With Poseidon, you fit a rubber cap over the spring chamber. The manual
> says you can leave it dry or fill it with an anti-freeze fluid.
> Options include Glycerol (sugar) mixed with water, or meths, vodka,
> or silicon oil. (Diaphragm 1st stage).
I realize how the Poseidon works. I haven't seen the VX10 ist stage but
from diagrams it appears to have a silicone filled chamber. The Tech 50D
has a diaphragm that seals it but there is nothing in the first stage. I
was wondering if one type is better than the other.
> Whatever you use, you need a flexible interface with the water to transmit
> ambient pressure. If there is air behind it, you will get compression
> problems, and if the rubber is punctured, you're back to water straight away,
> whereas a fluid would take time to dilute enough to be a problem.
The diaphragm in the Tech is silicone and it has pressurized air behind
it. It is well protected and fairly tough...It would be very difficult
to puncure accidentally.
Bob Favorite RVT
UC Davis VMTH UC Davis SCUBA The Octopus' Garden
VMD 490 Instructor safety diver safety diver
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