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3 types of pressure gauges

Both systems in one plus color coding–I like it

 

Today’s topic in our series ‘Guide for the Metrically Impaired’ is tank pressure. Those of us familiar with the Imperial system measure tank pressure in psi while the rest of the world uses bar.  So if the divemaster says that you need to turn around and head back to the boat when you have 125 bar, or you need to be back on the boat with 50 bar, how do you comply if your gauge is in psi? Most importantly, listen to the dive briefing and pay attention to the guidelines and hand signals. Here are some handy conversions:

Full tank                                                               3000-3200psi                     200-250 bar

Turn-around point or start

ascending to a shallower depth                      1000-1250 psi                     100-125 bar

Safety stop / low on Air                                     750 psi                                 50 bar

Low on air / Very low on air                             500 psi                                 30 bar

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