초록 ▼

Regulation of the oxygen partial pressure in the closed respiratory circuit of a diver. A sample of the gas mixture of the circuit is continuously taken and is passed into the monitor chamber (2) where its oxygen partial pressure is measured and an electrical control signal is generated if the measu

Regulation of the oxygen partial pressure in the closed respiratory circuit of a diver. A sample of the gas mixture of the circuit is continuously taken and is passed into the monitor chamber (2) where its oxygen partial pressure is measured and an electrical control signal is generated if the measured pressure falls below a reference value. The signal is used to trigger an injection to the diver (4) of a defined amount of an oxygen-rich gas mixture. Application to dives in deep water.

대표청구항 ▼

A process for regulating the oxygen partial pressure of a gas mixture in a respiratory circuit of a diver, the diver being provided with a closed circuit breathing apparatus connected to a remotely located monitor chamber in which there is a pressure equal to or close to atmospheric pressure, said p

A process for regulating the oxygen partial pressure of a gas mixture in a respiratory circuit of a diver, the diver being provided with a closed circuit breathing apparatus connected to a remotely located monitor chamber in which there is a pressure equal to or close to atmospheric pressure, said process comprising: (a) continuously removing a sample of the gas mixture of the respiratory circuit of the diver; (b) passing said sample into the monitor chamber where it expands, the partial oxygen pressure of the sample being determined therein, and an electrical control signal being produced when the pressure determined falls below a reference value; and (c) using the control signal for triggering an injection of a defined and preset amount of an oxygen-rich gas mixture to the respiratory circuit of the diver, the sample from the respiratory circuit being passed to the monitor chamber by a capillary conduit so that the variation in the oxygen partial pressure at the outlet from the capillary conduit reproduces the variation in the pressure at the inlet of the capillary conduit and, therefore, in the respiratory circuit, with a delay, the section of the capillary conduit being so selected as to limit the duration of the transfer of the sample along the capillary conduit.