Abstract: Perfusion systems and procedures for operating perfusion systems that can include a drip container, a drop detector, a perfusion conduit and at least one control valve or a syringe pump. During the procedure, at least one calibration of the measuring process and the storage of at least one calibration value are performed. A control unit regulates the control valve or the syringe pump while using at least one measurement performed by the measuring device and taking into account at least one calibrated value towards the desired flow volume.

Abstract: In a method for operating a portable electronic device comprising a chemical sensor, at least one reference reading is taken by the chemical sensor at least one predetermined point in time. At least one compensation value is determined based on at least one reference value wherein each reference value is derived from a result of a corresponding reference reading. A result of an operational reading of the chemical sensor is modified by the at least one compensation value.

Abstract: An input device for triggering a function of an electronic device comprises a humidity sensor (12), and a control unit (11). The control unit (11) analyzes a humidity signal (RH) supplied by the humidity sensor (12) and provides a trigger signal (C) subject to the analysis of the humidity signal (RH) for triggering the function of the electronic device (3). In such way, the function of the electronic device can simply be controlled by blowing at the input device (1).

Abstract: There is provided a portable electronic device with one or more environmental sensors for measuring an environmental or ambient parameter, a compensator for reducing the difference between a sensor output and the ambient parameter, the compensator being connected to receive a first input based on the sensor output and a second input based on an output of compensator calculated during a previous time step of calculation, and a context evaluator (36) for replacing the second input by an input selected based on conditions as determined by the context evaluator.

Abstract: In a method for operating a portable electronic device comprising a chemical sensor, at least one reference reading is taken by the chemical sensor at least one predetermined point in time. At least one compensation value is determined based on at least one reference value wherein each reference value is derived from a result of a corresponding reference reading. A result of an operational reading of the chemical sensor is modified by the at least one compensation value.

Abstract: An input device for triggering a function of an electronic device comprises a temperature sensor (12), and a control unit (11). The control unit (11) analyzes a temperature signal (T) supplied by the temperature sensor (12) and provides a trigger signal (C) subject to the analysis of the temperature signal (T) for triggering the function of the electronic device (3). In such way, the function of the electronic device can simply be controlled by blowing at the input device (1).

Abstract: A portable electronic device comprises a housing and a chemical sensor arranged inside the housing which chemical sensor is adapted to measure a property of at least one analyte. The device further comprises an opening in the housing for exposing the chemical sensor to the fluid to be analyzed.