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Apparatus for measuring weight and force with magnetic fluid seal

  • US 6,329,611 B1
  • Filed: 02/18/2000
  • Issued: 12/11/2001
  • Est. Priority Date: 02/22/1999
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring weight/force of a substance comprising:

  • a measuring unit having a transducer;

    a partition member provided between a measuring space in which said measuring unit is arranged and a substance space in which the substance whose weight/force is to be measured is placed, said partition member having a hole formed therein, said measuring space being communicated with said substance space through said hole;

    a force transferring member extending through said hole formed in the partition member such that a first end of said force transferring member situates within said substance space and a second end of said force transferring member situates within said measuring space and is coupled with said transducer;

    a magnetic fluid provided in a space within said hole such that said substance space and measuring space is isolated from each other in a liquid tight manner by means of said magnetic fluid; and

    a magnetic force generating means for producing a magnetic force such that said magnetic fluid is kept in position by said magnetic force.

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