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Analytical device for test fluids, comprises a conductive polymer composition

A polymer and composition technology, applied in the field of analytical devices, can solve problems such as the limitation of the range of conductivity changes

Inactive Publication Date: 2004-09-01
PERATECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Known sensors based on compressible polymer elements containing conductive fillers and relying on "percolation", i.e. electrical contact between filler particles, suffer from various limitations, in particular the range in which the conductivity can vary

Method used

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  • Analytical device for test fluids, comprises a conductive polymer composition
  • Analytical device for test fluids, comprises a conductive polymer composition
  • Analytical device for test fluids, comprises a conductive polymer composition

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Embodiment Construction

[0070] Referring to FIG. 1( a ), the contact head comprises a fluid flow tube 10 which, at least in the regions to be described, provides an inner surface which is inert to the contact fluid and electrically insulating. At the lower end of the tube 10 is a tube 12 fixed by means not shown, at its upper end a rigid grid 14 is formed. Tube 12 is secured within tube 10 in a fluid-tight manner, at least around grid 14 . At the upper end of the tube 10 is a slidable tube 16 which is movable up and down by means of a fine-tuning tool such as a micrometer (not shown) and which is formed with a rigid tube suitably made of glass frit or wire mesh. Grille18. Like tube 12 , tube 16 is secured within tube 10 in a fluid-tight manner. The grids 14 and 16 are electrically conductive, at least on their respective upper and lower sides, said grids serving as electrodes for connection (by means not shown) to an external circuit. The grid is thus made of metal, for example in the form of wove...

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Abstract

The present invention relates to an analytical device for test fluids, comprises a conductive polymer composition. A sensor for chemical species or biological species or radiation presenting to test fluid a polymer composition comprises polymer and conductive filler metal, alloy or reduced metal oxide and having a first level of electrical conductance when quiescent and being convertible to a second level of conductance by change of stress applied by stretching or compression or electric field, in which the polymer composition is characterised by at least one of the features in the form of particles at least 90% w / w held on a 100 mesh sieve; and / or comprising a permeable body extending across a channel of fluid flow; and / or affording in-and-out diffusion of test fluid and / or mechanically coupled to a workpiece of polymer swellable by a constituent of test fluid.

Description

technical field [0001] The present invention relates to an analytical device, in particular to a sensor for detecting and measuring quantities of substances in fluid form. Background technique [0002] Known sensors based on compressible polymer elements containing conductive fillers and relying on "percolation", ie electrical contact between filler particles, suffer from various limitations, in particular by the range in which the conductivity can vary. [0003] PCT patent application PCT / GB00 / 02402 with publication number WO 00 / 79546 discloses a sensor for chemical or biological species or radiation comprising: [0004] a) for providing a contact head of a polymer composition comprising at least one substantially non-conductive polymer and at least one conductive filler, and the polymer composition is electrically conductive at rest insulating, yet conductive when subjected to mechanical stress or electrostatic charge; [0005] b) means for accessing the test specimen of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/44G01N27/04G01N27/12G01T1/16H01C1/00H01C7/02H01C10/10
CPCH01C7/027G01N27/126H01C10/106
Inventor 戴维·卢斯戴维·布卢尔保罗·J·劳格林飞利浦·J·W·翰兹
Owner PERATECH