Mass flow rate measuring device with dual electrodes

US5560246A · kind A · utility

Assignee

• CLAAS OHG beschrankt haftende Offene Handelsgesellschaft · DE

Inventors

• Stefan Bottinger · Bielefeld, DE
• Horst Weigelt · Vellmar, DE
• Klaus Horn · Dortmund, DE
• Weiping Yang · San Diego, US

Key dates

• Filing date: Feb 22, 1995
• Grant date: Oct 1, 1996
• Expiry date: Feb 22, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/223
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to the type of device for measuring a mass flow in a harvester, where the flow is deflected at the outlet of an elevator (E) at a conveyor shaft wall (G) to form a stratified homogeneous flow and the flow is continuously measured as a function of the fill level by a capacitor (MC). The capacitor has a first capacitor plate (MC1) at a mass flow front side and a second capacitor plate (MC2) at a distance from the mass flow. The first capacitor plate is bordered and enclosed by a first protective electrode (R1) held at the same potential as the first capacitor plate by an impedance transformer. The second capacitor plate includes a portion of the conveyor shaft wall located opposite the first capacitor plate (MC1) and by lateral areas of the conveyor shaft wall. The invention improves this type of device by adding to the first protective electrode at least one partial second protective electrode (R2), where the first protective electrode (R1) extends at least partially perpendicular to the front side on the side walls of the conveyor shaft between the two capacitor plates (MC1, MC2) over at least a partial height (h1, h2) of the mass flow.