ELECTRONIC MEASURING INSTRUMENT AND METHOD FOR DETECTION OF CHEMICAL OR BIOCHEMICAL COMPONENTS WITH SENSORS BASED ON ION-SENSITIVE FIELD-EFFECT TRANSISTORS

摘要

The invention relates to an electronic measuring instrument for detection of chemical or biochemical components in liquids or gases. The invention further relates to a method for detection of said components in liquids or gases. The measuring instrument for determination of the chemical or biochemical components, comprises a probe construction, made from a sensor and reference electrode, a DC source, connected to a potentiostat, a signal generator, a voltage regulated current source, connected to the sensor, a measured value amplifier and a converter and an integral controller, connected to the signal generator. The method for detection of an analyte substance by means of a measuring instrument, comprising a detection circuit is based on holding the impedance of the sensor constant during the determination.