Method (100) for checking the
operational readiness of a closed-circuit
breathing apparatus (1) in a step sequence for carrying out the check with the steps: - Continuous metrological acquisition (104, 104') and recording of
pressure measurement signals P L a low-
pressure sensor (41) arranged in or on a low-
pressure system (77) of the closed-circuit
breathing apparatus (1), - Identification based on the
pressure measurement signal P L (81) of the low-
pressure sensor (41) whether there is currently a situation in which an inflow of quantities of gas into the low-
pressure system (77) has begun, - Storage of a first
pressure measurement signal P1 (109) at a first time t1 (108), which indicates the identified pressure situation immediately after the start of the inflow of gas quantities into the low-
pressure system (77) with a
breathing bag (3), - Storage of a second pressure measurement
signal P2 (114), which indicates a pressure situation at the end of the inflow of gas quantities into the low-pressure
system (77) at a second time t2 (113), - Formation (115) of a difference value ΔP (ΔP = P2 - P1) (116) between the first pressure signal P, (109) and the second pressure signal P2 (114), - Performing a comparison (117) between the difference value ΔP (116) with a difference threshold value P C (118) - Determining a result (94, 95) of the
verification of the functionality of the closed-circuit breathing apparatus based on the comparison (117), - Provision of an output signal (88) which indicates the result (94, 95) of the check.