Abstract: A connection module (10) for installation in a closed breathing circuit of a closed-circuit breathing apparatus (1000), includes an inlet port (12), for connection to a first closed circuit element, an outlet port (14), for connection to a second closed circuit element, a maintenance fluid inlet (16), and a maintenance fluid outlet (18). A maintenance device may be provided with the connection module and a controller (30) and control module regulated valves (40). Maintenance fluid is circulated through the closed breathing circuit by the controller and valves in a state in which the connection module (10) is installed in the closed-circuit breathing apparatus.

Abstract: A blower filter device includes a blower unit that draws and delivers ambient air; a filter unit that filters a harmful substance, or a filter coupling to couple and uncouple the filter unit. A control unit is configured to actuate the blower unit, to determine an operating state of the blower filter device and/or other respirator system components and/or a respirator system (100) as a whole and to generate an alarm if a determined operating state indicates a disturbance. An output unit is configured to receive the alarm from the control unit and to output the alarm. A communication interface (228) is configured for wireless network integration and to transmit the alarm via the network (238). A respirator system (100) with such a blower filter device, an operational infrastructure (300) with such a respirator system, as well as a method of blower filter operation and operational infrastructure monitoring are provided.

Abstract: A connection module (10) for installation in a closed breathing circuit of a closed-circuit breathing apparatus (1000), includes an inlet port (12), for connection to a first closed circuit element, an outlet port (14), for connection to a second closed circuit element, a maintenance fluid inlet (16), and a maintenance fluid outlet (18). A maintenance device may be provided with the connection module and a controller (30) and control module regulated valves (40). Maintenance fluid is circulated through the closed breathing circuit by the controller and valves in a state in which the connection module (10) is installed in the closed-circuit breathing apparatus.

Abstract: A breathing apparatus includes a filter, a motor and a blower driven by the motor. The filter is disposed ahead of the blower and the blower is configured to generate an air volume flow over the filter. A data storage unit has calibration curves for the air volume flow stored therein and the calibration curves are provided in characteristic line fields referenced to a known ambient pressure (p0, p1). Each of the characteristic line fields has a reference calibration curve referred to a predetermined operating state. A control unit is connected to the motor and the data storage unit. The control unit is configured to extrapolate one of the characteristic line fields for the operation of the motor by comparing a calibration curve ({dot over (V)}ox) for an unknown ambient pressure (px) recorded at a predetermined operating state with a reference calibration curve.

Abstract: A breathing apparatus includes a filter, a motor and a blower driven by the motor. The filter is disposed ahead of the blower and the blower is configured to generate an air volume flow over the filter. A data storage unit has calibration curves for the air volume flow stored therein and the calibration curves are provided in characteristic line fields referenced to a known ambient pressure (p0, p1). Each of the characteristic line fields has a reference calibration curve referred to a predetermined operating state. A control unit is connected to the motor and the data storage unit. The control unit is configured to extrapolate one of the characteristic line fields for the operation of the motor by comparing a calibration curve ({dot over (V)}ox) for an unknown ambient pressure (px) recorded at a predetermined operating state with a reference calibration curve.