GB2356939A - Portable viscosity tester - Google Patents
Portable viscosity tester Download PDFInfo
- Publication number
- GB2356939A GB2356939A GB9909113A GB9909113A GB2356939A GB 2356939 A GB2356939 A GB 2356939A GB 9909113 A GB9909113 A GB 9909113A GB 9909113 A GB9909113 A GB 9909113A GB 2356939 A GB2356939 A GB 2356939A
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- United Kingdom
- Prior art keywords
- fluid
- test
- sample tube
- test fluid
- membrane filter
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- 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.)
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
- G01N11/06—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by timing the outflow of a known quantity
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
A rotatable test head with dual demountable sample tubes 4 whereby pressurised air pressurises the uppermost sample<BR> tube whilst the lower sample tube is vented to atmosphere. The rotating test head 2 has a membrane filter 6 with a specific pore size. Test fluid is set to a level 4a, the sample tube is fitted and sealed to the rotating test head and rotated 180{ so the the test fluid is uppermost. When activated an air compressor 3e runs to a set operating pressure, an operating valve 3j is opened pressurising the fluid sample through the filter, any contamination within the test fluid bigger than the pore size blocks the filter. The sample tubes are rotated 180{ and the test repeated with the filtered fluid. The fluid flow time sequence in conjunction with the temperature of the test fluid is processed by the calculation electronics to give viscosity and contamination evaluation.
Description
2356939 Portable Viscositv-Tester This invention relates to a portable
viscosity tester.
Viscosity testers are well known which comprise of diagnostic equipment whereby fluids are heated or cooled to known temperatures then poured or pressurised through specific sized orifices and the time, taken for set fluids amounts to vent through the special sized orifices are used to ascertain the flui&s viscosity rating.
Viscosity testers are however of a laboratory type nature where skilled operators require substantial time to carry out a viscosity test on pure fluid samples.
According to the present invention there is provided a portable viscosity tester comprising a preferably electronically controlled piece of diagnostic equipment whereby a rotatable test head mounted on a control casing has dual demountable sample tubes fitted to a rotating test head incorporating a known valve arrangement whereby pressurised air can be made available as required to pressurise the uppermost demountable sample tube whilst the lower demountable sample tube can be vented to the atmosphere through the rotating test head and vent conduit. The rotating test head has a membrane filter with a specific pore size preferably of a screen filter type like a kitchen sieve) which is totally reproducible.
The test fluid to be tested is placed in the lower of the demountable sample tubes to the set level mark, the demountable sample tube is then fitted to the rotating test head by known seals and locking mechanism. ne rotating test head is rotated 180 so the demountable sample tube with the test fluid is uppermost.
The Portable Viscosity Tester is then switched on and the start button activated an internal air compressor will run up to a set operating pressure controlled by the pressure sensor and control electronics. The disPlay then indicates "start", the operating valve is then opened pressurising the upper demountable sample tube, the resultant air pressure drop starts the fluid flow timing sequence. The test fluid in the in the upper demountable sample tube is pressurised through the membrane filter, any contamination within the test fluid bigger than the specific pore size of the membrane filter blocks the pores of the filter membrane, the greater the contamination the greater the blockage.
As the test fluid filtering through the membrane filter is replaced by air as the upper demountable sample tube empties of test fluid the electronic pressure sensor stops the fluid flow timing sequence as it senses a distinct drop in pressure as the pressurised air vents easily through the membrane filter into the lower demountable sample tube and out through the rotating test head and vent conduit.
2 The fluid flow time sequence in conjunction with the temperature of the test fluid monitored by the temperature sensor is processed by the calculation electronics using stored previous test results for known viscosity test fluids at differing fluid viscosities and temperatures to give a possible viscosity evaluation of the test fluid.
As the fluid flow timing sequence is stopped the operating valve doses and the demountable sample tubes vent to atmosphere through the vent conduit. Ihe control and calculation electronics reset after a set time and the display shows " rotate", meaning rotate the head 180 then the diplay shows "start".
Operating the start button switch once again operates the air compressor to the set operating pressure and the operating valve is opened pressurising the upper demountable sample tube containing the filtered test fluid, the resultant pressure drop, within the pressure conduit, starting the second fluid flow time sequence, the test fluid is pressurised. through the membrane filter purging the membrane filter of any contamination particles clogging its lower surface. As the filtered test fluid is replaced by air as the demountable sample tube empties of test fluid the electronic pressure sensor senses the resultant pressure drop and stops the flow 3 timing sequence and closes the operating valve, any residual air pressure within the dismountable sample tubes venting to atmosphere through the vent conduit.
The time taken by the filtered test fluid to filter through the specific pore size filter is processed by the calculation electronics in conjunction with the temperature recorded during the test sequence of the test fluid to show the viscosity of the test fluid.
Any time difFerence between the first raw and second filtered tests of the test fluid is used by the electronic calculation software in the calculation of the level of particle contamination within the test fluid. The results of the tests are displayed on the display till the Portable Viscosity Tester is switched ofF or the system reset.
The results can also be displayed in printed form or relayed electronically to another monitoring system.
The membrane fidter can be removed and replaced after cleaning or replaced by a disposable membrane filter.
A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which: - 4 F!prel shows in perspective, the Portable Viscosity Tester with the demountable sample tubes fitted to the rotating test head.
Ejgure2 illustrates in schematic the Portable Viscosity Tester whereas the upper demountable sample tube (A) is filled with fluid and the preferable controls are shown in block diagram.
Figure 3 shows the rotating test head in perspective with the lower demountable sample tube (A) filled with test fluid separate from the rotating head.
Figure 3b shows the Portable Viscosity Tester in elevation with the lower demountable sample tube (A) scaled and locked onto the rotating test head to the upper position.
Figure 4 shows the rotating test head in section with the upper demountable sample tube (A) being pressurised whereas as its contained test fluid is pressurised through a membrane filter into a lower demountable sample tube (B) which is vented.
fture 5 shows the rotating test head with the filtered fluid in the upper demountable sample tube (B) being pressurised through the membrane filter into the lower demountable sample tube (A) and any filterable residue being flushed from the lower of the filter membrane.
Figure 5b shows, in elevation and section, the membrane filter separate from the rotating test.head.
Fjpre 5c shows the membrane filter in section with contamination on its surface blocking some of the specific set sized pores.
Referring to the drawings the Portable Viscosity Tester (1) comprises a rotating test head (2) mounted on a known control casing(3) with demountable sample tubes (4) with level indicators (4a) fitted to the rotating test head by known locks (2a) and sealed by known seals (5). A removable membrane filter(6), with a set pore size(6a) is retained by a retainer (7) in the passageway (2b) between the demountable sample tubes (4). Passageways (2c) connect through known seals (5) the known vent conduit (3a) and pressure conduit (3b) within the control casing (3) to the demountable sample tube air pipes (8). A known temperature sensor (9) senses the temperature of the test fluid (10) pressurised through the membrane filter (6). The temperature sensor (9) is electrically connected by known means to the control and calculation electronics(3c), powered by a 6 known power source, preferably an internal battery (3d).
The air pressure (11) used to pressurise the upper demountable sample tube (4) is compressed by the known air compressor (3e) and sensed by the electronic pressure sensor (3f), any air leakage within the air compressor (3e) is prevented by the known one-way valve (3g).
If required air is stored in the known air pressure reservoir(3h) and controlled by the operating valve (3j). Electric control is by an known on/off switch(3k) and known push button switch (31). Instructions and results are displayed on the known display (3m) by the known processing software electronics within the control and calculation electronics (3c).
Non filterable residue (10a) within the test fluid (10) is shown on the surface of the membrane filter (6), In an example of use the demountable sample tube (4)A, is filled with test fluid (10) to the level mark (4a.) and fitted, sealed and locked to the rotating test head (2). As in Figures 3 & 5 the demountable sample tubes (4) are labelled A & B for easy identification during the preferred test sequence.
7 The rotating test head (2) is then rotated 1800 so that the test fluid in the demountable sample tube (4)A, is uppermost.
The on/off switch (3k) is switched on and the push button switch (31) pressed the air compressor (3c) will compress the air in the air pressure reservoir (3h) up to a pre-determined set pressure then switch off. The display (3m) will then indicate the start pressure and the operating valve (3j) is opened. The upper demountable sample tube (4)A, is pressurised, the resultant air (11) pressure drop within the pressure conduit (3b) is sensed by the electronic pressure sensor (3f) automatically starting the test fluid(IO) flow timing sequence. The test fluid (10) in the upper demountable sample tube (4)A, is pressurised through the membrane filter (6) which consists of a screen filter with a set pore size (6a), any contamination (10a) over the set pore size (6a) which is suspended within the test fluid (10) blocks the pores (6a) of the membrane filter (6), the greater the contamination (10a) the greater the blockage.
As the test fluid (10) filtering through the membrane filter (6) is replaced by air as the demountable sample tube (4)A, empties of test fluid (10) the electronics pressure sensor (3f) senses a distinct drop in the pressure conduit 8 (3b) as the pressurised air within the demountable sample tube (4)A, vents quickly through the filter membrane (6), this pressure drop denotes the end of the test fluid(IO) flow sequence and the control and calculation electronics (3c) close the operating valve (3j).
The time taken by the test fluid (10) to filter through a specific pore size (6a) is processed by the control and calculation electronics (3c) in conjunction with the temperature of the test fluid (10) monitored by the temperature sensor(9), preferably a thermocouple to give a possible vicosity evaluation of the test fluid (10), the result of which is then stored by the electronics.
Air pressure (11) within the upper demountable sample tube (4)A, continues to vent to atmosphere through the lower demountable sample tube (4)B and out through the vent conduit (3a.).
The control and calculation electronics (3c) time an appropriate period to allow complete venting of the demountable sample tube (4)A, to occur then the display (3m) instructs the operator to turn the rotating head (2) 180" such that the demountable sample tube (4)B containing the filtered test fluid (10) is uppermost.
9 The display (3m) instructs the push button switch (31) to be operated which runs the air compressor(3c) till the air pressure reservoir (3h) reaches the pre-determined cut-off pressure.
The display(3m) will then indicate the start pressure and the operating valve (3j) is opened, the upper demountable sample tube (4)B is pressurised this resultant air pressure (11) drop within the pressure conduit (3b) is sensed by the electronic pressure sensor (3f) automatically starting the test fluid (10) flow timing sequence, the filtered test fluid (10) in the upper demountable sample tube (4)B, is pressurised through the membrane filter (6) purging the membrane filter (6) of any contamination by non filterable residue (10a) dogging its lower surface. As the filtered test fluid (10) filtering through the membrane filter (6) is replaced by air as the demountable sample tube (4)B, empties of oil, the electronic pressure sensor (3f) senses the resultant distinct pressure drop within the pressure conduit (3b) denoting the end of the filtered test fluid (10) flow sequence time the control and calculation electronic (3c) closing the operating valve (3j).
The time taken by the filtered test fluid (10) to filter through the specific pore size membrane filter (6) is processed by the control and calculation electronics (3c) in conjunction with the temperature of the test fluid (10) monitored by the temperature sensor (9) to show on the display (3m) the viscosity of the filtered test fluid (10).
Any time difference between the first raw and second filtered tests of the test fluid(I0) is used by the control and calculation electronics(3c) to calculate the level of particle contamination (10a) within the test fluid (10).
Claims (19)
1. A portable viscosity tester wherein in one example of the use a de mountable sample tube (4) is filled with test fluid (10) to the level mark (4a) and fitted, sealed and locked to the lower part of the rotating test head (2). For case of explanation the de-mountable sample tubes (4) as in figures 3 & 5 are labelled A & B for easy identification during the preferred test sequence.
The rotating test head (2) is then rotated 180 so that the test fluid in the de-mountable sample tube (4)A is uppermost.
Preferably an internal air compressor (3e) is used to compress air up to a pre-determined set pressure. When the operating valve (3j) is opened, the upper de-mountable sample tube ffiA is pressurised. The resultant air (11) pressure drop within the pressure conduit (3b) is preferably sensed by the electronic pressure sensor (3f) automatically starting the test fluid (10) flow timing sequence. The test fluid (10) in the upper de-mountable sample tube (4)A is pressurised through a membrane filter (6) which consists of a screen filter with a set pore size (6a) any particulate contamination (10a) over the set pore size (6a) which is suspended within the test fluid (10) blocks the pores (6a) of the membrane filter (6). The greater the particulate contamination (10a) the greater the blockage.
As the test fluid (10) filtering through the membrane filter (6) is replaced by air as the de-mountable sample tube (4)A empties of test fluid (10) the electronic pressure sensor (3f) senses a further drop in the pressure conduit (3b) as the pressurised air within the de-mountable sample tube (4)(A) vents quickly through the filter membrane (6) and out to atmosphere via the vent (3a) connected to the lower de-mountable sample tube this pressure drop denotes the end of the test fluid (10) flow sequence and the control and calculation electronics (3c) can be advantageously used to close the operating valve (3j). The time taken by the test fluid (10) to filter through a specific pore size (6a) is processed by the control and calculation electronics (3c) in conjunction with the temperature of the test fluid (10) monitored by the temperature sensor (9), preferably a known thermocouple to give a possible viscosity evaluation of the test fluid (10), the result of which is then stored by the electronics.
The rotating head (2) is turned 180 such that the de-mountable sample tube (4) (B) containing the filtered test fluid (10) is uppermost.
The air compressor (3e) runs up to a pre-determined set pressure and the operating valve (3j) is opened, the upper de-mountable sample tube (4)B is pressurised, this resultant air pressure (11) drop within the pressure conduit (3b) sensed by the electronic 1.b pressure sensor (3f) can be used to automatically start the test fluid (10) flow timing sequence, the filtered test fluid (10) in the upper de-mountable sample tube(4)B, is pressurised through the membrane filter (6) purging the membrane filter(6) of any contamination by non-filterable particulate (10a) clogging its lower surface. As the filtered test fluid (10) filtering through the membrane filter (6) is replaced by air as the de-mountable sample tube (4)B, empties of oil, the electronic pressure sensor (30 can be used to sense the resultant distinct pressure drop within the pressure conduit (3b) denoting the end of the filtered test fluid (10) flow sequence time and the control and calculation electronic (3c) can be used to close the operating valve (3j).
The time taken by the filtered test fluid (10) to filter through the specific pore size membrane (6a) is processed by the control and calculation electronics (3c) in conjunction with the temperature of the test fluid (10) monitored by the temperature sensor (9) which can be used to show on the display (3m) the viscosity of the filtered test fluid(IO).
Any time difference between the first raw and second filtered tests of the test fluid (10) is used by the control and calculation electronics (3c) to calculate the level of particulate contamination (10a) within the test fluid (10).
2. A portable viscosity tester as claimed in Claim 1 wherein the membrane filter (6) is replaceable and incorporates a de-formable scaling portion (5) at its outer edge.
3. A portable viscosity meter as claimed in Claims 1 & 2 whereas the membrane filter (6) is retained in a retainer whereas it can be further mounted in a rigid frame within the de-mountable sample tube in order that the membrane filter de-formable scaling portion (5) can be compressed to seal the membrane filter (6) perimeter against the rotating test head (2).
4. A portable viscosity tester as in Claim 1 whereas the compressed air (11) used by the machine is supplied from an external source.
5. A portable viscosity tester as in Claim 1 whereas the compressed air (11) used by the portable viscosity tester is supplied from a re chargeable internal air reservoir (3h).
6. A portable viscosity tester as in Claim 1 wherein the compressed air used by the portable viscosity tester is regulated (3f) to ensure that as far as is practical the air (11) supplied to the fluid (10) filled de mountable sample tube (4) during operation remains constant.
7. A portable viscosity tester as in Claim 1 & 5 wherein the compressed air (11) used by the portable viscosity tester is compressed to a set pre-determined level prior to the pressurisation of the fluid (10) filled de-mountable sample tube (4).
8. A portable viscosity tester as in Claim 1 whereas the de-mountable sample tube (4) has a fluid level indicator (4a) incorporated to ensue that the correct level of fluid (10) is used.
9. A portable viscosity tester as in Claim 1 whereas the rotating test head (2) incorporates ports and conduits to enable effective change over from pressure to vent and vice versa when the rotating test head (2) is rotated 180. Known seals (5) preventing leakage during rotation or the test sequence.
10. A portable viscosity tester as in Claim 1 whereas the rotating test head (2) is automatically rotated as required by known means during the test.
11. A portable viscosity test as in Claim 1 whereas instead of the rotating test head (2) rotating and the sample tubes (4) being de-mountable The viscosity of the test fluid (10) is ascertained by the control and calculation electronics when a measured amount of fluid (10) is pumped from one container (4) to the next through the 1(0 membrane filter (6) whilst the temperature of the fluid (10) is monitored.
Pre-filtered test particulate (10a) contamination is ascertained by the fluid (10) being pumped back through the membrane filter (6) purging the membrane filter (6) of any non-filterable particulate clogging its first filter surface.
The specific times of the unfiltered fluid (10) test as against the pre filtered fluid (10) test in conjunction with the temperatures of the test fluids (10) is used by the control and calculation electronics (3c) to ascertain the amount of particulate contamination (10a) of a fluid (10) provided that the pore size (6a) of the membrane filter (6) is below that of the particulate (10a).
12. A portable viscosity tester as in Claim 1 & 11 whereby the fluid (10) is vacuumed through the membrane filter (6) in preference to pumping or pressurising it through.
13. A portable viscosity tester as in any of the previous claims wherein the portable viscosity tester is not portable.
14. A portable viscosity tester as in any of the previous claims wherein a drip tray is incorporated in the base.
15. A portable viscosity tester wherein the de-mountable sample tubes rl (4) are fitted to a test head (2) with a membrane filter (6) securely fitted and scaled in the fluid port (2b) connecting them. The temperature is taken of the fluid to be tested by known means. The test head (2) is placed with the de-mountable sample tube (4) containing the test fluid upwards - similar in use to a known egg timer. A specific pressure pressurises the upper fluid (10) filled de mountable sample tube (4) and vents the lower de-mountable sample tube (4) by known means. The time taken by the test fluid (10) to filter through the membrane filter (6) is physically recorded by a known stopwatch or other known timing equipment. The test head with the de-mountable sample tubes (4) is turned so that the filtered test fluid (10) is upwards and the test repeated. The level of particulate (10a) contamination and viscosity of the test fluid (10) can be ascertained by the use of previously calculated tables using the following factors - the test fluid temperature, the time taken by the fluid (10) to filter through the filter membrane (6), the air (11) pressure used to pressurise the test fluid (10) through the filter membrane (6), any difference in the times taken by the filtered fluid (10) and the unfiltered / raw fluid (10) to flow through the filter membrane (6).
16. A portable viscosity tester as in any previous claim wherein the membrane filter (6) is not of a set pore size (6a) but is of an average 1 c6 pore size (6a) the membrane filter (6) is preferably made from material with pore sizes (6a) that are repeatable in their average size.
17. A portable viscosity tester as in any previous claim wherein the vent (3a) connecting air within the lower de-mountable sample tube (4) to atmosphere exits through conduits (8) and (2). Preferable the exit is above the preferable drip tray such that any fluid (10) exiting the vent (3a) is contained in the drip tray.
18. A portable viscosity tester as in any previous claim wherein the power source required to run the portable viscosity meter is a known battery (3d) preferably of a rechargeable type.
19. A portable viscosity tester substantially as hereinbefore described and with reference to the accompanying figures.
Cl
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9909113A GB2356939B (en) | 1999-04-22 | 1999-04-22 | Portable viscosity tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9909113A GB2356939B (en) | 1999-04-22 | 1999-04-22 | Portable viscosity tester |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9909113D0 GB9909113D0 (en) | 1999-06-16 |
| GB2356939A true GB2356939A (en) | 2001-06-06 |
| GB2356939B GB2356939B (en) | 2003-08-06 |
Family
ID=10851953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9909113A Expired - Fee Related GB2356939B (en) | 1999-04-22 | 1999-04-22 | Portable viscosity tester |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2356939B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6907770B2 (en) * | 2001-07-19 | 2005-06-21 | Sartorius Ag | Test device for filter systems |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2482302A1 (en) * | 1980-05-09 | 1981-11-13 | Soletanche | Continuous fluid viscosity meter for foundation laying - uses chamber where fluid exerts pressure on membrane separated measuring chamber |
| WO1996003634A1 (en) * | 1994-07-25 | 1996-02-08 | Met One, Inc. | Particle counter for contamination analysis of liquids |
| GB2307049A (en) * | 1995-11-11 | 1997-05-14 | Philip Graham Enright | Filtration apparatus and method |
-
1999
- 1999-04-22 GB GB9909113A patent/GB2356939B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2482302A1 (en) * | 1980-05-09 | 1981-11-13 | Soletanche | Continuous fluid viscosity meter for foundation laying - uses chamber where fluid exerts pressure on membrane separated measuring chamber |
| WO1996003634A1 (en) * | 1994-07-25 | 1996-02-08 | Met One, Inc. | Particle counter for contamination analysis of liquids |
| GB2307049A (en) * | 1995-11-11 | 1997-05-14 | Philip Graham Enright | Filtration apparatus and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6907770B2 (en) * | 2001-07-19 | 2005-06-21 | Sartorius Ag | Test device for filter systems |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9909113D0 (en) | 1999-06-16 |
| GB2356939B (en) | 2003-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AT | Applications terminated before publication under section 16(1) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20040422 |