| 摘要 |
The invention relates to a system composed of a closed-circuit breathing apparatus (1) and a monitoring device (13 - 15) therefor, wherein the closed-circuit breathing apparatus has: – a breathing mask (2), – a breathing circuit which leads from the breathing mask (2) via an expiration hose (3), a scrubber material cartridge (4) for binding CO2, a spring-loaded breathing bag (5) and an inspiration hose (7) and back to the breathing mask, – an oxygen cylinder (11) with compressed oxygen which is connected via a constant-metering device (8) to the breathing circuit and via a minimum valve (9) to the breathing bag (5), wherein the minimum valve (9) is configured to open in reaction to the breathing bag collapsing owing to a lack of breathing gas in the breathing circuit, and therefore to fill the breathing bag (5) with oxygen from the oxygen cylinder (11) until it is filled, and – a pressure sensor (12) for sensing the pressure in the oxygen cylinder (11), characterized in that the constant-metering device (8) is configured to provide the breathing circuit with oxygen with a low basic volume flow which is less than the average oxygen volume requirement of an unstressed person, and in that the monitoring device (13 – 15) is configured to calculate from the instantaneous pressure value supplied by the pressure sensor (12) and the output pressure value of the compressed oxygen in the oxygen cylinder at the start of use the quantity of oxygen consumed by the breathing of the apparatus wearer and the quantity of oxygen still remaining in the oxygen cylinder (12). |
