Patent ID: 8597593
Filing Date: 2013-12-03
Classification: B01L

Abstract:
1. A bottle top dispenser for handling liquids, comprising: a piston and cylinder arrangement for the exact take-up and dispensing of liquid volumes, with a cylinder and with a piston running, sealed off, in the cylinder and having a piston rod led upward out of the cylinder, a displacement measuring strip arranged directly on the piston rod or on a component connected to the piston rod in a fixed position relative thereto, the measuring strip extending axially in a direction of movement of the piston rod, and being magnetized, a sensor arrangement sensitive to magnetic fields which is arranged at a fixed location in the dispenser at a location adjacent to the piston rod or the component connected to the piston rod, the sensor arrangement having a sensor that is aligned with the measuring strip and separated from the measuring strip by only a narrow gap, an indicator for indicating the liquid quantity handled or to be handled, and an electronic evaluation circuit for evaluating analog output signals of the sensor and for activating the indicator, the electronic evaluation circuit being implemented by means of software of a microprocessor or microcomputer, wherein the sensor is a magnetoresistive sensor system, an analog-digital convert for converting the analog sensor signals, and wherein the evaluation circuit has a mixed-signal controller which evaluates the converted analog sensor signals directly via interpolation software.