Sampling device

Abstract

A sampling device comprising an elongate tube and an identification device. The identification device comprises a transponder which is removably attached to the tube by means of a clip. The identification device may thus be removed from the tube prior to analysis and/or replaced between successive sampling operations.

Description

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a device for sampling atmospheric conditions at a test location for subsequent analysis.

[0003] 2. State of the Art

[0004] It is known to provide a sampling device in the form of an elongate tube containing a quantity of adsorbing material. At least one end of the tube is provided with a removable cap which allows the interior of the tube, once exposed to the surrounding atmosphere at a test site, to be sealed prior to the analysis of its contents.

[0005] Analysis of the contents of the tube involves removing the cap from the end of the tube, applying heat to the tube to release adsorbed substances from the adsorbing material and driving the released substances out of the tube using a flow of gas.

[0006] However, a difficulty arises in labelling such tubes, in a convenient manner, such that they may be readily distinguished from one another at an analysis site and such that the tubes may be subsequently re-used.

[0007] We have now devised an arrangement which overcomes the limitations of existing sampling devices.

SUMMARY OF THE INVENTION

[0008] In accordance with the present invention, there is provided a sampling device comprising an elongate tube and an identification device comprising a transponder which is removably attached to the tube by means of a clip.

[0009] The identification device may thus be removed from the tube prior to analysis and/or replaced between successive sampling operations.

[0010] Preferably the transponder is attached to the tube such that it does not directly contact the exterior surface of the tube. The transponder is thus thermally isolated from the tube to a substantial extent, thereby allowing the identification device to remain attached to the tube during analysis.

[0011] Preferably the tube is formed with a reduced diameter portion within which the clip is attached to inhibit movement of the identification device along the length of the tube.

[0012] Preferably the reduced diameter portion is situated towards one end of the elongate tube, so that the opposite end of the tube may be heated during analysis without damaging the transponder.

[0013] Preferably the clip comprises a first part for attaching to the tube and a second part for attaching the transponder to the first part, thereby allowing a spent transponder to be readily replaced without sacrificing the clip.

[0014] Preferably the first part comprises a pair of resilient arms which engage opposite sides of the tube and connecting portions which extend between the two arms at spaced apart points along the axis of the tube, with the second part comprising a generally U-shaped member which clips around the transponder and the two connecting portions of the first part to hold the transponder against the undersides of those portions. The transponder is thus substantially encapsulated, with the gap between the two connecting portions providing a window through which the transponder may be read.

[0015] Preferably the resilient arms are arcuate in form and engage the sides of a cylindrical tube.

[0016] The clip, or at least the first part of the two part clip described above, is preferably formed from a material having low thermal conductivity, thereby further thermally isolating the transponder from the tube.

[0017] The sampling tube may be formed from glass or from a metallic material.

[0018] Also in accordance with the present invention, there is provided an identification device comprising a transponder and a clip for attaching the transponder to an elongate sampling tube.

[0019] Further in accordance with the present invention, there is provided a method of labelling a sampling tube comprising removably attaching a transponder to the tube by means of a clip.

[0020] An embodiment of the present invention will now be described by way of an example only and with reference to the accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a side elevation of a sampling device in accordance with the present invention;

[0022] FIG. 2 is an enlarged side elevation of a portion of the device of FIG. 1; and

[0023] FIG. 3 is a sectional view through the device of FIG. 1 along the line A,A′.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0024] Referring to the drawings, a sampling device is shown comprising an elongate cylindrical glass tube 2 containing a quantity of adsorbing material 4, the opposite ends of the tube 2 being closed by removable end-caps 6,8.

[0025] To acquire an atmospheric sample at a test location, the end-caps 6,8 are first removed from the tube 2 for a predetermined period of time and then replaced to prevent contamination of the sample. The caps 6,8 are once again removed for analysis of the sample, which requires the tube 2 to be heated to approximately 250° C. to release adsorbed substances from the adsorbing material 4 into a flow of inert gas through the tube.

[0026] An identification device in the form of a generally flat, rectangular transponder 10 is removably attached to a reduced diameter portion 12 at one end of the tube 2 by means of a two-part clip 14,16, the side-walls 18,20 of the reduced diameter portion 12 acting to prevent the clip 14,16 from sliding along the tube. The transponder 10 may, for example. be programmed with a unique identification code or with data relating to the sample contained within the tube 2, for subsequently identifying or processing the sample.

[0027] The first part 14 of the clip comprises a pair of resilient arms 22,24 formed with arcuate distal ends 26,28 which engage the surface of the tube 2 on opposite sides of the reduced diameter portion 12, and connecting portions 30,32 which extend between the proximal ends of the arms 22,24 on opposite sides of the clip, the connecting portions 30,32 comprising a generally straight centre section from which respective end sections project to the arms 22,24 (FIG. 3).

[0028] The second part 16 of the clip comprises a generally U-shaped aluminium strip which passes around the transponder 10 and clips around the outer edges of the straight central sections of the two connecting portions 30,32, such that the transponder is held against the undersides of the straight central sections of the two connecting portions, spaced from the surface of the tube 2.

[0029] The window 34 formed between the two connecting portions 30,32 allows the transponder 10 to be read and/or programmed by an external device.

[0030] By mounting the transponder to the tube by means of a clip, it will be appreciated that the transponder may be removed from the tube prior to analysis to prevent it from becoming damaged as the tube is heated.

[0031] However, by mounting the transponder at the opposite end of the tube to that which is to be heated during analysis and by arranging the clip such that thermal conduction between the tube and the transponder is minimised, the transponder may, if necessary, remain attached to the sampling tube 2 during analysis.

[0032] In the latter case, it will further be appreciated that the two-part clip arrangement 14,16 of the present invention allows a transponder which may have become damaged during analysis to be readily replaced by un-clipping the second part 16 of the clip from the first part 14.

[0033] The arrangement thus described provides a convenient means for labelling a tube containing an atmospheric sample.

Claims

1. A sampling device comprising an elongate tube and an identification device comprising a transponder which is removably attached to the tube by means of a clip.

2. A sampling device as claimed in

claim 1, wherein the transponder is attached to the tube such that it does not directly contact the exterior surface of the tube.

3. A sampling device as claimed in

claim 1, wherein the tube is formed with a reduced diameter portion within which the clip is attached to inhibit movement of the identification device along the length of the tube.

4. A sampling device as claimed in

claim 3, wherein the reduced diameter portion is situated towards one end of the elongate tube, so that the opposite end of the tube may be heated during analysis without damaging the transponder.

5. A sampling device as claimed in

claim 1, wherein the clip comprises a first part for attaching to the tube and a second part for attaching the transponder to the first part.

6. A sampling device as claimed in

claim 5, wherein the first part comprises a pair of resilient arms which engage opposite sides of the tube and connecting portions which extend between the two arms at spaced apart points along the axis of the tube, with the second part comprising a generally U-shaped member which clips around the transponder and the two connecting portions of the first part to hold the transponder against the undersides of those portions.

7. A sampling device as claimed in

claim 6, wherein the resilient arms are arcuate in form and engage the sides of a cylindrical tube.

8. A sampling device as claimed in

claim 1, wherein the clip is formed from a material having low thermal conductivity.

9. A sampling device as claimed in claims 5, wherein at least the first part of the two-part clip is formed from a material having low thermal conductivity.

10. A sampling device as claimed in

claim 1, wherein the sampling tube is formed from glass.

11. A sampling device as claimed in

claim 1, wherein the sampling tube is formed from a metallic material.

12. Also in accordance with the present invention, there is provided an identification device comprising a transponder and a clip for attaching the transponder to an elongate sampling tube.

13. An identification device as claimed in

claim 12, arranged such that the transponder is attached to the tube such that it does not directly contact the exterior surface of the tube.

14. An identification device as claimed in

claim 12, wherein the clip comprises a first part for attaching to the tube and a second part for attaching the transponder to the first part.

15. An identification device as claimed in

claim 14, wherein the first part comprises a pair of resilient arms which engage opposite sides of the tube and connecting portions which extend between the two arms at spaced apart points along the axis of the tube, with the second part comprising a generally U-shaped member which clips around the transponder and the two connecting portions of the first part to hold the transponder against the undersides of those portions.

16. An identification device as claimed in

claim 15, wherein the resilient arms are arcuate in form to engage the sides of a cylindrical tube.

17. An identification device as claimed in

claim 12, wherein the clip is formed from a material having low thermal conductivity.

18. An identification device as claimed in

claim 14, wherein at least the first part of the two-part clip is formed from a material having low thermal conductivity.

19. A method of labelling a sampling tube comprising removably attaching a transponder to the tube by means of a clip.

20. A method as claimed in

claim 19, wherein the transponder is attached to the tube such that it does not directly contact the exterior surface of the tube.

21. A method as claimed in

claim 19, wherein the tube is formed with a reduced diameter portion within which the clip is attached to inhibit movement of the identification device along the length of the tube.

22. A method as claimed in

claim 21, wherein the reduced diameter portion is situated towards one end of the elongate tube, so that the opposite end of the tube may be heated during analysis without damaging the transponder.

23. A method as claimed in

claim 19, wherein the clip comprises a first part for attaching to the tube and a second part for attaching the transponder to the first part.

24. A method as claimed in

claim 23, wherein the first part comprises a pair of resilient arms which engage opposite sides of the tube and connecting portions which extend between the two arms at spaced apart points along the axis of the tube, with the second part comprising a generally U-shaped member which clips around the transponder and the two connecting portions of the first part to hold the transponder against the undersides of those portions.

25. A method as claimed in

claim 24, wherein the resilient arms are arcuate in form and engage the sides of a cylindrical tube.

26. A method as claimed in

claim 19, wherein the clip is formed from a material having low thermal conductivity.

27. A method as claimed in

claim 23, wherein at least the first part of the two-part clip is formed from a material having low thermal conductivity.

28. A method as claimed in

claim 19, wherein the sampling tube is formed from glass.

29. A method as claimed in

claim 19, wherein the sampling tube is formed from a metallic material.