Abstract: The invention relates to a device and a method for measuring an electrical property of fluid flowing through a pipe, comprising at least a first measuring electrode and a second measuring electrode placed in spatial contact with the pipe, wherein the first measuring electrode is received in a body placed inside the inner wall of the pipe, and the first measuring electrode is separated from the inner wall of the pipe by a gap, this gap extending over at least a part of the periphery of the inner wall of the pipe. As a result of these measures the distance between the measuring electrodes is greatly reduced, so that the measurement accuracy increases considerably. The measuring circuit is preferably adapted for repeated successive measurement of the resistance value and the capacitance of the fluid.

Abstract: The invention relates to a device and a method for measuring an electrical property of fluid flowing through a pipe, comprising at least a first measuring electrode and a second measuring electrode placed in spatial contact with the pipe, wherein the first measuring electrode is received in a body placed inside the inner wall of the pipe, and the first measuring electrode is separated from the inner wall of the pipe by a gap, this gap extending over at least a part of the periphery of the inner wall of the pipe. As a result of these measures the distance between the measuring electrodes is greatly reduced, so that the measurement accuracy increases considerably. The measuring circuit is preferably adapted for repeated successive measurement of the resistance value and the capacitance of the fluid.

Abstract: Measuring device for local measurement of an electrical property of the content of a container, comprising at least three electrodes disposed adjacently of each other in height direction and electrically insulated from each other, wherein each of the electrodes can be connected to an electrical measuring circuit for measuring, via one of the electrodes and one other electrode connected to an electrical earth, the electrical property of the content of the container in the vicinity of the electrodes, wherein the electrical measuring circuit is adapted to generate at least one electric measuring signal representing the measured electrical property, and a control unit for connecting the one electrode to the electrical measuring circuit and connecting the other electrode to an electrical earth.