Granular material electric charge analyzer

Electrostatic charge measurement of a flowing powder on a surface
  • Principle

    Granucharge is an automated instrument able to measure quickly and precisely the charge buildup inside a powder while flowing on surfaces of various nature.

    The electric charge density of a powder is measured with a customized Faraday cup after a controlled flow inside a vibrating conduit with a particular V-shape.

    The system is designed to obtain precise and reproducible results.
    The charge time evolution is plotted and analyzed with a dedicated software.

  • Key Benefits

    Measurement is simple, fast and intuitive.

    Delivered with intuitive software, the charge is measured through the time.

    Also allows the comparison of results.

    Accessibility is password protected.

    All data are automatically collected and stored for post processing.

    Easy data transfer and automatic report generation.

    Closed system for safety requirements.

    Possibility to control the environmental conditions (temperature, humidity, selected gas).

    Recorded standard operating procedures increase the repeatability of measurements.

  • Description

    Electrostatic charges are created inside a powder during a flow. This apparition of electric charges is due to the triboelectric effect, which is a charge exchange at the contact between two solids.

    During the flow of a powder inside a device (mixer, silo, conveyor, …), the triboelectric effect takes place at the contact between the grains and at the contact between the grains and the device.

    Therefore, the characteristics of the powder and the nature of the material used to build the device are important parameters.

    GranuCharge instrument measures automatically and precisely the quantity of electrostatic charges created inside a powder during a flow in contact with a selected material.

    The powder sample flows inside a vibrating V-tube and fall in a Faraday cup connected to an electrometer. The electrometer measures the charge acquired by the powder during the flow inside the V-tube. In order to obtain reproducible results, a rotating or a vibrating device is used to feed the V-tube regularly.


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