Device for determining the concentration of substances having paramagnetic properties

• US 4,763,509 A
• Filed: 12/17/1986
• Issued: 08/16/1988
• Est. Priority Date: 12/19/1985
• Status: Expired due to Fees

• Current Assignee: Dragerwerk AG
• Original Assignee: Dragerwerk AG
• Inventors: Eder, Alfred, Albarda, Scato
• Primary Examiner(s): Noland, Tom
• Assistant Examiner(s): WILLIAMS, HEZRON
• Application Number:
  US06/943,541
• Time in Patent Office: 608 Days
• Field of Search: 73/23, 73/27 R, 73/27 A, 324/204
• US Class Current: 73/25.02
• CPC Class Codes: G01N 27/74 of fluids G01N24/00 takes precedence

Abstract

A device for the determination of the concentration of substances with paramagnetic properties, particularly oxygen, in substance mixtures comprises a cell assembly and devices to produce a magnetic field as well as to measure changes in the magnetic induction. Great mechanical accuracy and stability in the measuring of a change in the magnetic induction uninfluenced by external disturbing fields or by mechanical changes due to external temperature fluctuations or vibrations with a coil assembly for producing a magnetic field and for measuring the induction signal comprising self-contained coil carriers, which, surrounding a cell assembly and are arranged respectively at a distance from the axis of rotation of the cell assembly.

Claims

1. In a device for determining the concentration of a substance with paramagnetic properties, comprising a rotatable hollow container having an axis of rotation and having a partition dividing it into an assembly of a plurality of cells, means for providing a gas to be tested in at least one of said cells and a control gas in at least one of said cells, a coil assembly for producing a magnetic induction and for picking up the magnetic induction produced by a substance with paramagnetic properties surrounding said assembly of cells and being spaced from the axis of rotation, the improvement comprising a first compartment extending around said hollow cylinder at a spaced location from the axis thereof and having a coil for producing magnetic induction, and a second compartment extending around said hollow cylinder having a coil for detecting the paramagnetic properties of the gas being tested and being spaced from the axis of rotation.

2. A device according to claim 1, wherein said device has a housing defining a chamber for said coil assembly on each side of the axis of rotation thereof, each including the first coil for producing magnetic induction and a second coil winding for producing an electrical signal corresponding to the magnetic induction.

3. A device according to claim 1, wherein said partition divides said cell assembly into two half compartments, one of said compartments comprising a measuring compartment, and the other of said compartments comprising a closed control gas compartment having a known concentration of the gas which is to be determined.

4. A device according to claim 1, wherein said container comprises a hollow cylinder, said partition dividing said cylinder into a test gas chamber and a control gas chamber, said test gas chamber including a central opening for the inflow of a test gas and a peripheral dishcarge for the test gas.

5. A device according to claim 4, including a housing surrounding said container, said container comprising a hollow cylinder having a top inlet opening over the test gas chamber said test gas chamber opening below said top inlet opening having a peripheral discharge opening.

6. A device according to claim 1, wherein said cell assembly comprises a sintered aluminum oxide ceramic.