Hamilton Bonaduz Ag

Philipp Arquint

Bernd Offenbeck

Dirk Schönfuss

Fabio Sovrano

Theo Gaupp

Marlene Frank

Karl Furger

Clara Caminada-Cavelier

Louis Willi

Willi Louis

A method is provided for calibrating impedance-spectroscopic biomass sensors that are embodied to detect information regarding the quantity and/or size of living cells in a biomass by means of an electric field having a periodically changing field direction A calibration suspension encompasses an electrically conductive viscously flowable or viscoelastic carrier substance and electrically conductive solid particles and/or solid semiconductor particles received therein. An electric field is generated having a periodically changing field direction, which acts on the calibration suspension. At least one permittivity value is detected, respectively representing a permittivity of the calibration suspension, in a context of at least two electric fields having different field direction change frequencies. A difference value is ascertained that represents a difference between the detected permittivity values. The difference value is compared with a reference value associated with the calibration suspension.

Method for calibrating biomass sensors operating with impedance spectroscopy and use of a suspension for carrying out such a method

A reference electrode assembly for an electrochemical sensor, in particular for a potentiometric sensor, comprising a reference half-cell space having a reference electrode provided therein, the reference half-space comprising a storage space in which a reference electrolyte is provided at any rate in a storage state of the reference electrode assembly, the reference half-cell space further comprising a lock space that is permeable at any rate with respect to the passage of reference electrolyte into an environment of the reference half-cell space, the storage space, in the storage state of the reference electrode assembly, being separated from the lock space with respect to the passage of reference electrolyte, the reference electrode assembly being designed such that a connection permeable for the passage of reference electrolyte from the storage space to the lock space can be created between the storage space and the lock space in order to transfer the reference electrode assembly from the storage state to an operative state.

Reference electrode assembly for electrochemical sensor and electrochemical sensor

A device for measuring a periodic signal includes: a first control unit for generating an electrical input signal (V) of the period T; a light source for generating an optical input signal directed to an object being measured from the electrical input signal (V); an optical receiver for detecting and converting the signal reflected from the object being measured, the signal corresponding to the optical input signal altered in terms of phase and amplitude, into an electrical measurement signal (V); and a plurality of measurement channels connected in parallel between the optical receiver and a second control unit, each measurement channel being connected in series to a switching element, a filter element, and an analog-to-digital converter, wherein the second control unit is suitable for evaluating the measurement signals from the plurality of measurement channels, and in which the electrical measurement signal (V) is applied to each of the plurality of measurement channels, the first control unit is connected to the plurality of switching elements and is suitable for actuating the switching elements for different time intervals in each case, and the analog-to-digital converters have a maximum sampling rate of less than 2&#xd7;1/T.

Apparatus and method for measuring a periodic signal

The potentiometric sensor element comprises a measuring element and a shield housing permanently bonded to the measuring element, in which housing an electronic sensor unit is accommodated and which is sealed off against external influences. The electronic sensor unit is connected to a contactless interface adapted to exchange energy and signals with a corresponding contactless interface in an electronic base unit. The shield housing comprises an outer sleeve and an inner sleeve, accommodated within the outer sleeve, wherein the electronic sensor unit is accommodated in the inner sleeve and is surrounded there by a first casting compound. The filled inner sleeve is in turn bonded permanently to the outer sleeve by means of a second casting compound, which is different from the first casting compound.

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Bonaduz, Switzerland

Philipp Arquint