Magnetic field producing device for determining the concentration of a paramagnetic substance passed through a rotating cell chamber

• US 4,808,922 A
• Filed: 12/18/1986
• Issued: 02/28/1989
• 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): Strecker, Gerard R.
• Application Number:
  US06/944,257
• Time in Patent Office: 803 Days
• Field of Search: 324/204, 324/243, 73/27 A
• US Class Current: 324/204
• 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 divided into several chambers, which is arranged to revolve with relation to a service for producing a magnetic field penetrating the cell assembly, and a coil assembly associated with this assembly for the conversion of the magnetic induction produced in it by the paramagnetic substance into an electrical signal. The assembly of devices producing magnetic fields and their associated measuring field coils is unaffected by external interferences such as transfer of mechanical vibrations or influences of external magnetic fields. For this purpose, at least four or more, even number of devices producing magnetic fields with their respective measuring field coils are arranged on both sides of the cell assembly and symmetrically to the axis of rotation, on a common housing, and the magnetizing polarity of the devices is combined with the magnetizing polarity of their respective measuring field coils in alternating orientation.

Claims

1. A device for determining the concentration of a substance with paramagnetic properties such as oxygen in a substance mixture comprising a body defining a hollow cell having an upper side and a lower side and having at least one control substance chamber and at least one measuring substance chamber through which a substance to be measured is passed, a housing, means in said housing for rotatably supporting said cell body for rotation therein, at least four devices each producing a magnetic field, and a plurality of measuring field coils each of said measuring field coils being associated with a corresponding one of said devices, respective pairs of said devices and corresponding measuring coils being arranged on both sides of said cell fixed to said housing and positioned symmetrically to the axis of said cell body axis of rotation, the magnetizing polarity of the devices being arranged with the magnetizing polarity of their respective measuring field coils in an alternating orientation.

2. A device according to claim 1, wherein said devices producing magnetic fields are in the form of electrical coil bodies, said coil bodies being wound together with a measuring field coil about a common core, by the alternating execution of the winding of the electrical coil body and the measuring field coil in the same direction and in an opposite direction.

3. A device according to claim 1, wherein the devices producing the magnetic coils are in the form of permanent magnets about which said measuring field coils are wound and have alternate winding directions, said permanent magnets being of the same polarity direction and combined with measuring field coils of the same winding direction.

4. A device according to claim 1, wherein said housing has a field conducting plate at its top and at its bottom containing said devices and said measuring field coils.