Importance

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Abstract

A system includes a closed-circuit respirator (1) with a breathing mask (2), a closed breathing circuit, which leads from the breathing mask via an exhalation tube (3), a lime cartridge (4) for binding CO₂, a spring-loaded breathing bag (5) and an inhalation tube (7) to the breathing mask. A pressurized oxygen tank (11) is connected to the circuit via a constant dispensing unit (8) and to the breathing bag via a minimum flow control valve (9), which opens upon a collapse of the breathing bag (lack of breathing gas in the circuit) and fills the breathing bag from the oxygen tank. A pressure sensor (12) detects the pressure in the oxygen tank. A constant dispensing unit introduces oxygen with a volume lower than a mean oxygen volume demand. A monitoring device (13-15) calculates a quantity of oxygen consumed and still remaining from the detected pressure and an initial pressure value.

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First Claim