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---------------- Begin Forwarded Message ---------------- Date: 9/22/99 3:04 PM Received: 9/22/99 9:03 PM From: John Walker, techdive@ea*.ne* To: Jim Cobb, cobber@ci*.co* History lesson #2. SOS Decompression Meter, Up until the 1980's the SOS decompression meter had been the most well known decompression device. It was designed in 1959 by Carlos Alinari and manufactured by an Italian firm, SOS Diving Equipment Limin=ted. The SOS Meter or DCP (Decompression Computer) is still manufactured and available. The DCP is a one-compartment, pneumatic device which "is purpoted to be an anolog to a "general" body tissue. Due to the design of the DCP, the compartment half-time varies with the pressure differential across the ceramic resistor. As the diver descends with the device, the anbient pressure increases on the flexible bag, forcing gas through the ceramic resistor into the constant volume chamber. The role of the ceramic resistor is to simulate nitrogen uptake and elimination in the body. The pressure increases in the constant volume chamber is indicated by the bourdon tube gauge. The gauge face indicates the safe ascent depth for the diver. As the diver ascends,the gas pressure in the constant volume chamber will become greater than the external pressure and the gas flow will be reversed. A major problem wit the DCP is its deveation from the U.S. Navy no-decompression limits at deeper depths. In evaluating ten DCPs Howard determined that the no-decompression limits allowed by DCPs were more conservative than the U.S. Navy limits at depths shallower than 60fsw, but less conservative at depths greater than 60 fsw. ----------------- End Forwarded Message ----------------- ------------------------------------------------------------------- Learn About Trimix at http://www.cisatlantic.com/trimix/trimix.html -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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