Dräger Safety Ag&co. Kgaa

Lutz Rüffert

Hans-Ullrich Hansmann

Björn Petersen

Marcus Romba

Thomas Pernot

Sandra Dankertt

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 (p, p). 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)}) for an unknown ambient pressure (p) recorded at a predetermined operating state with a reference calibration curve.

Breathing apparatus with compensation of the ambient pressure

A breath alcohol-measuring device is provided, which includes a mouthpiece which can be inserted or attached, with a blow-in opening and with a blow-out opening and with a hole for breathing gas sampling in the breath alcohol-measuring device. The breath alcohol-measuring device () is equipped with a radiation source () and with a light guide () receiving the radiation of the radiation source (). The light guide () is arranged extending from the housing of the breath alcohol-measuring device () up to the blow-out opening of the mouthpiece () such that the light guide () acts as an illuminating means for the mouthpiece ().

Growing community of inventors

Scharbeutz, Germany

Lutz Rüffert