Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition
Patent
1994-02-14
1995-09-12
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
422102, 422103, 7386451, 239 33, B01L 300
Patent
active
054494940
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to sampling devices.
According to the present invention there is provided a sampling device comprising a closed reaction vessel, and a cylinder formed integrally with a wall of the vessel and having a bore in which a plunger is mounted for sliding sealing movement, the inner end of the bore being sealed from the interior of the vessel by a sealing element capable of being ruptured by the application of force against the sealing element by the plunger, part of the plunger projecting externally from the bore and having on its surface means for holding a predetermined quantity of a sample, and the arrangement being such that said part of the plunger carrying the sample can by depression of the plunger be moved into the interior of the vessel.
According to a preferred feature of the invention said means for holding a predetermined quantity of a sample comprises one or more holes or recesses in the plunger. In a preferred arrangement, said means for holding a predetermined quantity of a sample comprises a plurality of circumferential groves in the plunger, in which grooves a predetermined quantity of a sample can be retained by surface tension.
According to another preferred feature of the invention, the plunger is adapted to seal the bore when the said part is disposed in the interior of the vessel. For this purpose, the end portion of the plunger remote from the vessel may be of divergent cross-section, or may have one or more circumferential sealing ribs, so as to be capable of forming a tight seal in said bore when the said part of the plunger is disposed within the interior of the vessel.
According to a further preferred feature of the invention, the vessel has at least one chamber in the wall thereof which chamber is isolated from the interior of the vessel by a first seal and from the ambient surroundings by a second seal and which is intended to contain a reagent, and a second plunger mounted in a bore in a second cylinder on the wall of the chamber which plunger is operable to rupture said second and first seals in succession and serves then to seal the chamber (and in consequence the interior of the vessel) from the ambient surroundings.
BRIEF DESCRIPTION OF THE DRAWINGS
One embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal sectional view of a sampling device according to the invention, and
FIG. 2 illustrates a modification of a plunger of the device.
Referring to the drawings, a cylindrical tube molded from a plastics material such as polypropylene affords a vessel 10 and has at one axial end thereof a reduced diameter portion forming a cylinder 11 in the bore 12 of which one end portion 13 of a plunger 14 is slidingly and sealingly mounted. The end of the bore 12 adjoining the interior of the vessel is formed with an integral sealing element 16, and the inner end of the plunger is cut so as to form a sharp edge 18 capable of rupturing the seal. The middle part of the plunger projecting from the bore is formed with a series of shallow circumferentially extending grooves 20 which are adapted to hold a predetermined small quantity of a sample, using surface tension properties. The free end portion 21 of the plunger further from the vessel is slightly divergent so that when the plunger is depressed to rupture the seal and to carry the sample in the grooves into the interior of the vessel, the end portion 21 of the plunger forms a tight seal in the bore 12.
The opposite end of the cylindrical tube is closed off by an annular plug 24 molded from a plastics material such a polypropylene and having a central bore 26. The end of the bore adjoining the interior of the vessel is sealed by a rupturable sealing diaphragm 27, and spaced along the bore from the diaphragm is a second rupturable sealing element 28 which is moulded integrally with the plug. A sealed chamber 25 formed between the diaphragm 27 and element 28 may contain a reagent. The axiall
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Amersham International plc.
Bhat N.
Warden Robert J.
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