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Measuring-instrument

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Measuring instrument

Details

Inventors: Templin, Manfred;
Assignee:
Primary Examiner: Goldberg; Gerald
Assistant Examiner: Williams; Hezron E.
Attorney, Agent or Firm: Kontler; Peter K.

A test probe for monitoring the level of liquid in a storage container, especially of a flammable liquid, has a guide tube which is inserted through and secured in the threaded hole of a cover of the container. The probe is provided with a magnetic indicating system mounted in part on a bearing which surrounds the tube within the container. Magnetically coupled to the bearing and movable along and within the tube is an electrical contact carriage which makes contact with fingers provided on rolled-on metal tracks provided on non-conductive profiled strips located at least in part in the tube. The strips are reinforced by profiled rails which are located in the tube.

DETAILED DESCRIPTION I claim: 1.
A test instrument, particularly a probe for monitoring the level of liquid in a container having a cover provided with a tapped hole, comprising a guide tube threadedly securable in said hole and having a portion within the container; a float system in the container; a magnetic indicating system for the level of said float system; an electrical contact carriage guided on said portion of said tube; two sets of profiled guide rails spaced from each other and extending lengthwise in said tube parallel to each other, said sets of guide rails being disposed diametrically opposite each other and being parallel to a central longitudinal plane of said guide tube; a profiled electrically non-conductive strip push-mounted on each of said sets of guide rails and extending lengthwise thereof, said strips having lateral faces provided with guides for said carriage; and a plurality of electrically conductive resistance members extending lengthwise and forming integral parts of each of said profiled strips.
2.
An instrument as defined in claim 1, wherein said magnetic indicating system includes an inner magnetic system on said carriage and an outer magnetic system surrounding said inner system and provided on said float system, said carriage including a traverse member extending into the space between said profiled strips and touching contacts on said resistance members.
3.
An instrument as defined in claim 2, wherein said magnetic indicating system constitutes a means for indirectly coupling said carriage with said float system.
4.
An instrument as defined in claim 1, wherein said guide rails are integral with said guide tube.
5.
An instrument as defined in claim 1, wherein said guide tube has an outer tube element and an inner tube element telescoped into said outer tube element, said guide rails being integral with said inner tube element.
6.
An instrument as defined in claim 1, wherein said guide rails of each set together define an elongated channel of polygonal cross-section

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