GEAR MEASURING MOISTURE CONTENT OF LOOSE SUBSTANCES Russian patent published in 1999 - IPC

FIELD: measurement technology. SUBSTANCE: gear incorporates container of examined substance-capacitive humidity converter, compactor and measurement electric circuit. Capacitive humidity converter has three electrodes, one common and two external, and is manufactured in the form of rectangular vessel made from dielectric material that is divided into three sections, first and second ones are meant to take in examined substance and third one is filled with material having dielectric permittivity equal to dielectric permittivity of dry substance at moment of measurement. Capacitive humidity converter presents differential capacitor. Three electrodes of capacitor are connected to bridge circuit. Electric circuit incorporates generator, bridge circuit, differential amplifier with rectification, amplifier with changeable bias to which output unit processing output signal by level is linked and recorder connected in series. All components of gear are housed in one case, electronic components are assembled on one board, electrodes of capacitive humidity converter are made from flat metal plates. Window of container of examined substance protrudes above upper base of case. Compactor is mounted above window of container. EFFECT: enhanced productivity of measurements with increased accuracy, simplified design f gear. 3 dwg