Method and circuit assembly for measuring physical parameters in fluids and their application

摘要

The method involves providing a test signal in form of a clocked direct current voltage to a base sensor. The direct current is integrated into an output- current or voltage. An output signal of an integrator is provided to a Schmitt-trigger (uaX2), which is connected parallel to another Schmitt-trigger (uaX1). Output signals of the triggers are provided to an XOR-gate, where physical variables of fluids are calculated via a micro-computer from output signals of the gate. The variables are delivered to evaluation logic for determining resistance and the capacitance of the base sensor. Independent claims are also included for the following: (1) a circuit arrangement for implementing the method for measurement of physical variables of electrical reduced conductive and non conductive fluids (2) a base sensor for application in the method.