| 摘要 |
<p>Breathing tank gas pressure is periodically monitored by a pressure transducer (42), and battery powered, microprocessor controlled circuitry (21) responsive to the output of the transducer (42) controls a speech synthesizer (44) to articulate pressure values. The speech synthesizer (44) drives a piezoelectric speaker (48) that is bonded to the inner surface of a water-sealed housing (20) carried by the diver. Tank gas pressures are articulated at predetermined pressure differentials, e.g., every 100 psi reduction. Gas pressure measurements are annunciated at smaller differentials as tank pressure approaches critically low tank pressures. To conserve electrical power, the battery (52) is automatically disconnected from the circuitry (21) when tank pressure is below a predetermined amound indicating that the tank is nearly empty.</p> |
