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In a message dated 5/30/00 7:52:01 AM Central Daylight Time, tingtong74@ya*.co* writes: << anyone has any idea why we need 2 pressure ports for the 1st stage ? i though 1 will do for the pressure gagues ?>> The equipment manufacturers will tell you that they do it to make for more flexible configuration and set up. That might be partly true. The more important reason is that they did it because their customers demanded it. Why? Because when digital (especially hoseless) computers came on the market divers found them to be unreliable and wanted to back them up with analog gauges. They needed a second port to accommodate an SPG. <<also why are there 300bar/4000psi and 400bar/5000psi gagues ? gas law beomes non-liner from somewhere 240 bar onwards...doesn't make sense to pump tank to any higher rite ? can we just stick to a 300bar pressure gague/spg ?>> Any mechanical pressure gauge is most accurate at midrange. Ideally, a pressure gauge should have a range of about twice the pressure that you will be measuring. Practically, for measuring tank pressure, you should choose a pressure gauge with a range about 50% more than the pressure of the tank when it is full. That way, it will be in the more accurate portion of its range during most of your dive. Good diving, Dale -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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