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Device for measuring powder flow rate and apparatus and method for supplying powder

  • US 5,929,343 A
  • Filed: 11/06/1996
  • Issued: 07/27/1999
  • Est. Priority Date: 03/30/1995
  • Status: Expired due to Fees
First Claim
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1. A powder flow rate measuring device comprising:

  • a cylindrical measuring tube made of an insulating material;

    a pair of measuring electrodes provided along a circumferential portion of the measuring tube, the pair of measuring electrodes being band-like members provided on the circumferential portion of the measuring tube spirally in parallel with each other, anda band-like guard electrode provided on the circumferential portion of the measuring tube spirally between the pair of measuring electrodes, the guard electrode being narrower than the measuring electrodes,wherein a flow rate of powder passing through the measuring tube is measured as a change in electrostatic capacity between the pair of measuring electrodes.

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