CA1288323C - Test-tube throttle - Google Patents
Test-tube throttleInfo
- Publication number
- CA1288323C CA1288323C CA000523452A CA523452A CA1288323C CA 1288323 C CA1288323 C CA 1288323C CA 000523452 A CA000523452 A CA 000523452A CA 523452 A CA523452 A CA 523452A CA 1288323 C CA1288323 C CA 1288323C
- Authority
- CA
- Canada
- Prior art keywords
- test
- tube
- flow
- strip
- impregnated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2214—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling by sorption
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/405—Concentrating samples by adsorption or absorption
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/2813—Producing thin layers of samples on a substrate, e.g. smearing, spinning-on
- G01N2001/2826—Collecting by adsorption or absorption
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Glass Compositions (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
ABSTRACT
The invention describes a test-tube for the quantitative measurement of very small concentrations of gas components with a reagent strip impregnated with chemical reagents. Arranged before the reagent strip in the direction of flow of the test gas, is a flow throttling element. By means of this arrangement, the test air, which is passed through the test-tube by an air feed pump, has its forward motion throttled to such an extent that the test air flows slowly past the sensitive reagent strip producing a change of colour in zones.
The invention describes a test-tube for the quantitative measurement of very small concentrations of gas components with a reagent strip impregnated with chemical reagents. Arranged before the reagent strip in the direction of flow of the test gas, is a flow throttling element. By means of this arrangement, the test air, which is passed through the test-tube by an air feed pump, has its forward motion throttled to such an extent that the test air flows slowly past the sensitive reagent strip producing a change of colour in zones.
Description
il3~3 The invention relates to a test-tube for quantitative measurement of very small concentrations of gas components with a reagent strip impregnated with chemical reagents.
In the case of a known test-tube of this kind, the reagent strip, impregnated with a detecting reagent, is held to the inner wall of the test-tube with a granular filler material (German OS 32 36 792). It is to be regarded as a disadvantage that, as a result of fluctuations in grain-size and packing density, the granular filler material may cause flows of test gas which differ widely locally. This may lead to irregularities, and thus to inaccuracies in the display provided by the highly sensitive reagent strip. In addition to this, there is the danger that dust may be formed during the filling and application of the granular filler material. If any of this dust is deposited onto the reagent strip, it can also cause trouble and lead to incorrect indications.
It is therefore the purpose of the invention to provide a test-tube with which very small concentrations of gas components may be measured and may be detected with great accuracy with a sensitive reagent strip.
According to one aspect of the present invention, there is provided a test-tube for the quantitative measurement of minimal concentrations of gas components with a test strip impregnated with chemical reagents, a gas permeable, flow-throttling holding element arranged in front of this test strip in the flow through direction, wherein the flow throttling element is a fine-grained layer of a chemically ne/~t material which has a substantially uniform grain size.
~, . ..";, .
332~
The advantages obtained with the invention are, in particular, that the test air delivered through the test-tube by the feed pump has its forward motion throttled or reduced, before ~
- 2a -3..~ .323 , .
reaching the reagent strip, to such an extent that it flows slowly and uniformly past the said strip, thus ensuring a clearly determinable display.
An example of embodiment is illustrated in the drawing attached hereto and is explained hereinafter in greater detail. In the said drawing:
Figure 1 is a longitudinal section through a test-tube with a reagent strip and a flow throttle according to the invention; and Figure 2 is a longitudinal section through a test-tube with a reagent strip and another design of flow throttle according to the invention.
As may be seen from 1 and 2, glass test-tube 1 comprises molten ends 2 and 3. In the direc-tion of flow 4 of the test air, the following components are arranged in the said test-tube.
A mounting component 5 which is permeable to the test air, a flow throttle 6 in the form of a layer finely granular, chemically inert material (Fig. 1), or a flow throttle 6a in the form of a capillary tube (Fig. 2), a gas permeable mounting component 7, a granular sorption - or reaction layer 8, a gas permeable mounting component 9, a gas permeable mounting component 10 which secures a reagent strip 11 in the longitudinal direction of the test-tube 1 and, finally a further gas permeable mounting component 12.
The gas permeable mounting components 5, 7, 9 and 12 consist of a synthetic material, glass, ceramic or metal.
Reagent strip 11 contains a detecting reagent for the constituent in the air or gas under investigation to be determined, the detection reaction producing a change in colour. In this ~.2~ 3 connection, reaqent. str;p 11 is made oF an ahsorbent mater;a]., for example, paper, cardboard or t.extile which is impregnated with the detect;.ng reaqent.
However, the said reagent strip 11 may al.so consist of a non-absorbent carri.er, for example, a synthetic material or metal, to which ;.s appl;.ed a layer of fi.nely qranu].ar absorbent material suitably impregnated with the detecting reagent.
~ ccord;.nq to Figure 1, flow throttle 6 arranged beEore reagent strip ll, ;.s a finely granuJ.ar layer of chemically inert material, preferably of uniform grain size, for example, spheres of equal size~ This produces a definite flow resistance and thus uniform distribution of the flow of test qas. This layer acts as a so-called flow throttle. It serves to throttle, or slow down the forward mot;.on t.o the test air, passed through t.he test-tube by the feed pump, to such an extent that the said test air flows slowly past the reagent strip. This allows the sensitive reaqent strip to be d;..scoloured in zones and ensures a clear]y determinable display.
In Fiqure 2, flow throttle fia is in the form of a capillary tube inserted into the qlass tube with its edges sealed, with a spec;fic openinq and lenqth. The effect of this is similar to that of layer 6 described above in connection with Fiqure 1 If, for the purpose of direct determination oF the gas to be measured, no suitable reagent is availab].e for the test-tube procedure, but a su;.table reagent is availab~e for an eas;.ly determinable sequential product, then it is advantageous to incorporate, after throt-tling layer 6 according to Figure 1, or after capillary tube 6a according to Figure 2, the granular sorption - or reaction layer 8 which is impregnated with a reagent for converting an easily determinable chemical sequential product.
If unwanted accompanying substances in the test gas to be measured falsify the results, but the gas component to be determined reacts directly with reagent strip 11, sorption - and reaction layer 8 may act as a filter to hold back these unwanted accompanying substances selectively. In this case, layer 8 is also impregnated with a reagent which reacts with the accompanying substance and filters it out. In the form of a preliminary layer in ~ront of reagent strip 11, layer 8, suitably impregnated, may serve as a filter, and as a conversion layer, for a new chemical sequential product, if this is necessary.
In order to take a measurement, ends 2 and 3 of the test-tube are broken off and test air is drawn through the open test-tube in the direction of arrow 4, by means of an air feed pump. These test air flows firs-t through flow throttling layer 6 (Fig. 1) or capillary tube 6a (Fig. 2), then through sorption - and reaction layer 8, after which it flows uniformly past reagent strip 11. In the presence of a substance to be detected, this allows sensitive reaction strip 11 to be discoloured in zones.
, .... ... ...
In the case of a known test-tube of this kind, the reagent strip, impregnated with a detecting reagent, is held to the inner wall of the test-tube with a granular filler material (German OS 32 36 792). It is to be regarded as a disadvantage that, as a result of fluctuations in grain-size and packing density, the granular filler material may cause flows of test gas which differ widely locally. This may lead to irregularities, and thus to inaccuracies in the display provided by the highly sensitive reagent strip. In addition to this, there is the danger that dust may be formed during the filling and application of the granular filler material. If any of this dust is deposited onto the reagent strip, it can also cause trouble and lead to incorrect indications.
It is therefore the purpose of the invention to provide a test-tube with which very small concentrations of gas components may be measured and may be detected with great accuracy with a sensitive reagent strip.
According to one aspect of the present invention, there is provided a test-tube for the quantitative measurement of minimal concentrations of gas components with a test strip impregnated with chemical reagents, a gas permeable, flow-throttling holding element arranged in front of this test strip in the flow through direction, wherein the flow throttling element is a fine-grained layer of a chemically ne/~t material which has a substantially uniform grain size.
~, . ..";, .
332~
The advantages obtained with the invention are, in particular, that the test air delivered through the test-tube by the feed pump has its forward motion throttled or reduced, before ~
- 2a -3..~ .323 , .
reaching the reagent strip, to such an extent that it flows slowly and uniformly past the said strip, thus ensuring a clearly determinable display.
An example of embodiment is illustrated in the drawing attached hereto and is explained hereinafter in greater detail. In the said drawing:
Figure 1 is a longitudinal section through a test-tube with a reagent strip and a flow throttle according to the invention; and Figure 2 is a longitudinal section through a test-tube with a reagent strip and another design of flow throttle according to the invention.
As may be seen from 1 and 2, glass test-tube 1 comprises molten ends 2 and 3. In the direc-tion of flow 4 of the test air, the following components are arranged in the said test-tube.
A mounting component 5 which is permeable to the test air, a flow throttle 6 in the form of a layer finely granular, chemically inert material (Fig. 1), or a flow throttle 6a in the form of a capillary tube (Fig. 2), a gas permeable mounting component 7, a granular sorption - or reaction layer 8, a gas permeable mounting component 9, a gas permeable mounting component 10 which secures a reagent strip 11 in the longitudinal direction of the test-tube 1 and, finally a further gas permeable mounting component 12.
The gas permeable mounting components 5, 7, 9 and 12 consist of a synthetic material, glass, ceramic or metal.
Reagent strip 11 contains a detecting reagent for the constituent in the air or gas under investigation to be determined, the detection reaction producing a change in colour. In this ~.2~ 3 connection, reaqent. str;p 11 is made oF an ahsorbent mater;a]., for example, paper, cardboard or t.extile which is impregnated with the detect;.ng reaqent.
However, the said reagent strip 11 may al.so consist of a non-absorbent carri.er, for example, a synthetic material or metal, to which ;.s appl;.ed a layer of fi.nely qranu].ar absorbent material suitably impregnated with the detecting reagent.
~ ccord;.nq to Figure 1, flow throttle 6 arranged beEore reagent strip ll, ;.s a finely granuJ.ar layer of chemically inert material, preferably of uniform grain size, for example, spheres of equal size~ This produces a definite flow resistance and thus uniform distribution of the flow of test qas. This layer acts as a so-called flow throttle. It serves to throttle, or slow down the forward mot;.on t.o the test air, passed through t.he test-tube by the feed pump, to such an extent that the said test air flows slowly past the reagent strip. This allows the sensitive reaqent strip to be d;..scoloured in zones and ensures a clear]y determinable display.
In Fiqure 2, flow throttle fia is in the form of a capillary tube inserted into the qlass tube with its edges sealed, with a spec;fic openinq and lenqth. The effect of this is similar to that of layer 6 described above in connection with Fiqure 1 If, for the purpose of direct determination oF the gas to be measured, no suitable reagent is availab].e for the test-tube procedure, but a su;.table reagent is availab~e for an eas;.ly determinable sequential product, then it is advantageous to incorporate, after throt-tling layer 6 according to Figure 1, or after capillary tube 6a according to Figure 2, the granular sorption - or reaction layer 8 which is impregnated with a reagent for converting an easily determinable chemical sequential product.
If unwanted accompanying substances in the test gas to be measured falsify the results, but the gas component to be determined reacts directly with reagent strip 11, sorption - and reaction layer 8 may act as a filter to hold back these unwanted accompanying substances selectively. In this case, layer 8 is also impregnated with a reagent which reacts with the accompanying substance and filters it out. In the form of a preliminary layer in ~ront of reagent strip 11, layer 8, suitably impregnated, may serve as a filter, and as a conversion layer, for a new chemical sequential product, if this is necessary.
In order to take a measurement, ends 2 and 3 of the test-tube are broken off and test air is drawn through the open test-tube in the direction of arrow 4, by means of an air feed pump. These test air flows firs-t through flow throttling layer 6 (Fig. 1) or capillary tube 6a (Fig. 2), then through sorption - and reaction layer 8, after which it flows uniformly past reagent strip 11. In the presence of a substance to be detected, this allows sensitive reaction strip 11 to be discoloured in zones.
, .... ... ...
Claims (9)
1. A test-tube for the quantitative measurement of minimal concentrations of gas components with a test strip impregnated with chemical reagents, a gas permeable, flow-throttling holding element arranged in front of this test strip in the flow through direction, wherein the flow-throttling element is a fine-grained layer of a chemically inert material which has a substantially uniform grain size.
2. A test-tube according to claim 1, characterized in that the grains in the flow-throttling layer are spherical.
3. A test-tube according to claim 1, characterized in that a granular reaction layer is applied to the flow throttling element and to the reagent strip.
4. A test-tube according to claim 3, characterized in that the reaction layer is impregnated with a reagent for converting the polluting component to be determined into an easily detectable chemical sequential product.
5. A test-tube according to claim 4, characterized in that the reaction layer is impregnated with a reagent which reacts with an unwanted accompanying substance and filters it out,
6. A test-tube according to claim 1, characterized in that the reagent strip is made from an impregnated absorbent material.
7. A test-tube according to claim 1, characterized in that the reagent strip is made from a nonabsorbent material to which is applied a layer of an absorbent, finely granular material which has been impregnated in a suitable manner.
8. A test-tube according to claim 1, characterized in that one end of the reagent strip is laid around a gas permeable mounting element in order to secure the said strip in the test tube in the longitudinal direction thereof.
9. A test-tube for the quantitative measurement of minimal concentrations of gas components with a test strip impregnated with chemical reagents, a gas permeable, flow-throttling holding element arranged in front of this test strip in the flow through direction, wherein the flow-throttling element is a capillary tube which is located in the testing tube in a close fitting relationship.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3542780A DE3542780C1 (en) | 1985-12-04 | 1985-12-04 | Test tube |
| DEP3542780.9 | 1985-12-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1288323C true CA1288323C (en) | 1991-09-03 |
Family
ID=6287535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000523452A Expired - Lifetime CA1288323C (en) | 1985-12-04 | 1986-11-20 | Test-tube throttle |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0225520B1 (en) |
| JP (1) | JPS62175665A (en) |
| AT (1) | ATE47629T1 (en) |
| AU (1) | AU576305B2 (en) |
| BG (1) | BG77348A (en) |
| CA (1) | CA1288323C (en) |
| DE (2) | DE3542780C1 (en) |
| HU (1) | HU195579B (en) |
| ZA (1) | ZA869163B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8711788U1 (en) * | 1987-09-01 | 1987-10-22 | Drägerwerk AG, 2400 Lübeck | Colorimetric dosimeter with different display sensitivity |
| DE4125555A1 (en) * | 1991-08-02 | 1993-02-04 | Rene Dr Cousin | Monitoring waste gas emissions - using adsorber-filled sampling probe in waste gas stream |
| NL1003272C2 (en) * | 1996-06-05 | 1997-12-10 | Inst Milieu & Agritech | Measurement of gas, particle and aerosol emissions - using narrow diameter tube with flow restrictor in middle, paper carrier impregnated with reagent is inserted on site |
| NL1003492C2 (en) * | 1996-07-03 | 1998-01-07 | Sgt Exploitatie Bv | Sample tube and a method of manufacturing such a sample tube. |
| DE10261842A1 (en) * | 2002-12-20 | 2004-07-15 | Atc Dr. Mann E.K. | Universally applicable color indicator system for sorption and testing of vapors contains a biosorbent impregnated with a chemical as color-changing indicator reagent |
| BR112013023315B1 (en) * | 2011-03-14 | 2023-05-02 | Weatherford Switzerland Trading And Development Gmbh | CONTAINER SET FOR SAMPLING A FLUID AND PROCESS FOR SAMPLING GAS HYDROGEN SULPHIDE |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2569895A (en) * | 1943-07-12 | 1951-10-02 | Main-Smith John David | Detection of carbon monoxide by palladous sulfite and/or palladosulfites |
| US2549974A (en) * | 1948-05-19 | 1951-04-24 | Stewart Warner Corp | Gas detection apparatus |
| DE1013445B (en) * | 1953-11-26 | 1957-08-08 | Auergesellschaft Ag | Gas flue tubes |
| SE418332B (en) * | 1974-03-05 | 1981-05-18 | Collin Consult Ab Lars | PROCEDURE AND DEVICE FOR ANALYSIS OF THE EMISSION CONTENT IN THE EXHAUST ENGINE EXHAUST |
| JPS53100446A (en) * | 1977-02-15 | 1978-09-01 | Mitsubishi Electric Corp | Trouble detecting device of electric machine and apparatus |
| DE2854421B1 (en) * | 1978-12-16 | 1980-03-27 | Draegerwerk Ag | Test tube for the quantitative determination of aerosol-like metal cyanides |
| DE3024847A1 (en) * | 1980-07-01 | 1982-02-11 | Bayer Ag, 5090 Leverkusen | DEVICE FOR THE COLORIMETRIC MEASUREMENT OF GAS TRACKS |
| DE3131698A1 (en) * | 1981-08-11 | 1983-03-03 | Messer Griesheim Gmbh, 6000 Frankfurt | Method for determining pollutants in gases |
| DE3236792C2 (en) * | 1982-10-05 | 1986-12-18 | Drägerwerk AG, 2400 Lübeck | Gas test tubes with reagent strips |
| DE3242304C2 (en) * | 1982-11-16 | 1986-07-10 | Drägerwerk AG, 2400 Lübeck | Gas monitoring device with indicator tape and a pre-pipe containing a conversion filling for chemical conversion of the gas to be measured into a substance that can be detected by the indicator tape |
| EP0133326A3 (en) * | 1983-06-27 | 1985-04-03 | Diversified Medical Technologies, Inc. | Disposable breath analyzer |
| AU1988883A (en) * | 1983-10-05 | 1984-12-20 | Jesse F. Gump | Viewing device for alcoholic breath tester |
-
1985
- 1985-12-04 DE DE3542780A patent/DE3542780C1/en not_active Expired - Lifetime
-
1986
- 1986-11-20 AT AT86116111T patent/ATE47629T1/en not_active IP Right Cessation
- 1986-11-20 CA CA000523452A patent/CA1288323C/en not_active Expired - Lifetime
- 1986-11-20 EP EP86116111A patent/EP0225520B1/en not_active Expired
- 1986-11-20 DE DE8686116111T patent/DE3666630D1/en not_active Expired
- 1986-12-02 AU AU66007/86A patent/AU576305B2/en not_active Ceased
- 1986-12-02 BG BG077348A patent/BG77348A/en unknown
- 1986-12-04 HU HU865020A patent/HU195579B/en not_active IP Right Cessation
- 1986-12-04 JP JP61287871A patent/JPS62175665A/en active Pending
- 1986-12-04 ZA ZA869163A patent/ZA869163B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE3666630D1 (en) | 1989-11-30 |
| AU6600786A (en) | 1987-06-11 |
| ZA869163B (en) | 1987-08-26 |
| HU195579B (en) | 1988-05-30 |
| EP0225520B1 (en) | 1989-10-25 |
| AU576305B2 (en) | 1988-08-18 |
| DE3542780C1 (en) | 1991-07-04 |
| HUT42184A (en) | 1987-06-29 |
| JPS62175665A (en) | 1987-08-01 |
| ATE47629T1 (en) | 1989-11-15 |
| EP0225520A3 (en) | 1988-05-25 |
| BG77348A (en) | 1993-12-24 |
| EP0225520A2 (en) | 1987-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |