Abstract: A device for detecting mass particles in air flows guided in a pipe, in particular of seeds to be distributed in a seed drill. A sensor element is disposed on the pipe. The sensor element is a piezoelectric element. An impact surface is disposed on the side of the piezoelectric element facing the interior of the pipe. A damping body is arranged on the side of the piezoelectric element facing away from the interior of the pipe. A rigid base body is disposed on the side of the piezoelectric element facing away from the interior of the pipe.

Abstract: A downpipe sensor detects single grains in a downpipe. A transmitting unit and a receiving unit are spaced apart across a measurement field. Light beams emitted by the transmitting unit are guided in the case of free beam path through the downpipe interior to the receiving unit and are attenuated during a passage of a grain. The receiving unit is a line element with a predefined number of receiving elements. The transmitting unit has light-emitting diodes with perforated screens and a reflector element in the form of a right triangular prism. Light is emitted from the diodes transversely to a receiving axis of the receiving unit, bundled via the perforated screens, guided into the reflector element, deflected by total reflection toward a exit surface to form a light band of parallel light beams. The light band illuminates the entire measurement field with even intensity.

Abstract: An aircraft includes, but is not limited to at least one fuselage with at least one pressurized fuselage region and at least one non-pressurized region and at least one air conditioning system for air conditioning the at least one pressurized fuselage region. The non-pressurized region includes, but is not limited to an air inlet and an air outlet connected to an air source from the pressurized fuselage region. Consequently it is possible to avoid the use of blowers, outlet valves and ram air flaps for ventilating non-pressurized regions of an aircraft.

Abstract: A downpipe sensor detects single grains in a downpipe. A transmitting unit and a receiving unit are spaced apart across a measurement field. Light beams emitted by the transmitting unit are guided in the case of free beam path through the downpipe interior to the receiving unit and are attenuated during a passage of a grain. The receiving unit is a line element with a predefined number of receiving elements. The transmitting unit has light-emitting diodes with perforated screens and a reflector element in the form of a right triangular prism. Light is emitted from the diodes transversely to a receiving axis of the receiving unit, bundled via the perforated screens, guided into the reflector element, deflected by total reflection toward a exit surface to form a light band of parallel light beams. The light band illuminates the entire measurement field with even intensity.

Abstract: A device for detecting mass particles in air flows guided in a pipe, in particular of seeds to be distributed in a seed drill. A sensor element is disposed on the pipe. The sensor element is a piezoelectric element. An impact surface is disposed on the side of the piezoelectric element facing the interior of the pipe. A damping body is arranged on the side of the piezoelectric element facing away from the interior of the pipe. A rigid base body is disposed on the side of the piezoelectric element facing away from the interior of the pipe.

Abstract: An aircraft includes, but is not limited to at least one fuselage with at least one pressurised fuselage region and at least one non-pressurized region and at least one air conditioning system for air conditioning the at least one pressurised fuselage region. The non-pressurized region includes, but is not limited to an air inlet and an air outlet connected to an air source from the pressurised fuselage region. Consequently it is possible to avoid the use of blowers, outlet valves and ram air flaps for ventilating non-pressurized regions of an aircraft.