EP0227785A1 - Measuring conductivity of a suspension - Google Patents
Measuring conductivity of a suspensionInfo
- Publication number
- EP0227785A1 EP0227785A1 EP19860904321 EP86904321A EP0227785A1 EP 0227785 A1 EP0227785 A1 EP 0227785A1 EP 19860904321 EP19860904321 EP 19860904321 EP 86904321 A EP86904321 A EP 86904321A EP 0227785 A1 EP0227785 A1 EP 0227785A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- conductivity
- liquid
- pulverulent substance
- added
- 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.)
- Pending
Links
- 239000000725 suspension Substances 0.000 title description 2
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract 3
- 239000012254 powdered material Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 3
- 239000011344 liquid material Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract 6
- 238000010926 purge Methods 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
Definitions
- the present invention proposes to add a quantity of powdered material to a container and to obtain an accurate weight reading of the material added by the difference of readings of the container with its contents before and after the addition and then to calculate the
- liquid added to the container corresponds accurately to the amount of powdered material in the container and is not dependent on the accuracy of delivery of a given -* weight of material to the container.
- the source of error in delivering material to the container is thus
- Figure 1 is a schematic side elevation of conductivity measuring apparatus
- Figure 2 is a diagram of connections of the apparatus of Figure 1 with a microprocessor.
- a strain gauge 12 has a measuring head 31 supporting an aluminium seating disc 32. Supported on the disc 32 is a polypropylene vessel 11 of 250 ml capacity. A powder fill funnel 17 has a closeable outlet 33 for feeding material into the vessel 11. A fluid supply
- a 24 volt d.c. electric motor 14 drives a stirrer bl ' ade 13 at the base of the container 11 at about 1000 r.p. . by means of a gearbox 15 and a bearing housing 34-
- a sensor probe 27 extends into the container 11 to measure the electrical conductivity of the container contents.
- An extract conduit 21 extends from the base of the container 11 to a 24 volt peristaltic pump 22 leading to an analyzer conduit 23 and a drain conduit 24, each conduit being controlled by a respective pinch valve 25 and 26.
- a microprocessor controls the sequence of operation of the apparatus illustrated in Figure 1.
- the microprocessor receives inputs from the strain gauge 12 and the output of the conductivity sensor 27- When the empty container 11 is placed on the strain gauge, a reading of its weight is fed into the microprocessor.
- the valved outlet 33 of the funnel 11 is opened to supply a quantity of powder material to the container and then closed again and a second reading of the container weight is supplied by the strain gauge 12 to the microprocessor.
- the difference of the two readings corresponds to the weight of the powder material fed into the container 11 and the microprocessor calculates from a predetermined formula the quantity of fluid to be added to the powdered material through the conduit 16 from a supply of heated liquid through a pinch valve 3 .
- the microprocessor receives conductivity readings from the sensor 27 and compares each reading with preceding reading to determine when the output becomes constant. The constant reading is compared with a standard in the microprocessor. If the comparison is within a certain tolerance, the pump 22 is energized and the pinch valve 25 is opened to transfer the contents of the container 11 to the analyzer along conduit 23- If the comparison indicates that the reading is not within the allowed tolerance, the contents of the container 11 are fed to the drain conduit 24 by energizing the pump 22 and opening the pinch valve 26.
- the container 11 is prepared for further analysis by rincing with a solvent from the conduit 16 and draining the rinsing solvent through the conduit 21, pump 22 and conduit 24-
- the microprocessor has a liquid crystal display 37 to indicate the readings made and the various stages of the operation.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Ceramic Engineering (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Puisqu'il est plus facile d'effectuer une mesure précise d'un volume de fluide que d'une quantité d'une substance pulvérulente, on effectue un mélange de substance pulvérulente et de fluide dans des proportions désirées en pesant un récipient avant et après adjonction d'une quantité de substance pulvérulente pour constater par différence le poids de la substance pulvérulente ajoutée, en calculant la quantité de liquide à ajouter à cette quantité pesée de substance pulvérulente et en ajoutant la quantité nécessaire de fluide à la substance pulvérulente. On procède ensuite à une mesure de conductivité du mélange, agité autant que de besoin, et une fois que la mesure de conductivité est devenue constante, elle est comparée avec un étalon et le contenu du récipient est alors acheminé vers un analyseur principal si la comparaison se situe dans une tolérance donnée ou sinon vers une purge.Since it is easier to make an accurate measurement of a volume of fluid than of an amount of a pulverulent substance, a mixture of pulverulent substance and fluid is carried out in desired proportions by weighing a container before and after adding a quantity of pulverulent substance to determine by difference the weight of the pulverulent substance added, by calculating the quantity of liquid to be added to this weighed quantity of pulverulent substance and by adding the necessary quantity of fluid to the pulverulent substance. The conductivity of the mixture is then measured, stirred as much as necessary, and once the conductivity measurement has become constant, it is compared with a standard and the contents of the container are then sent to a main analyzer if the comparison is within a given tolerance or if not towards a purge.
Description
MEASURING CONDUCTIVITY OF A SUSPENSION
In conductivity measurements of a mixture of a liquid
- and powdered material, it has been usual to add a fixed quantity of powdered material to a fixed quantity of 5 liquid in a container, mix the two together and make the conductivity measurement. The supply of a fixed quantity of powdered material is difficult to achieve with great accuracy, which limits the accuracy of the conductivity measurement.
10 The present invention proposes to add a quantity of powdered material to a container and to obtain an accurate weight reading of the material added by the difference of readings of the container with its contents before and after the addition and then to calculate the
15 amount of liquid required to be added to the measured weight of powdered material and to add the calculated quantity of liquid to the container and then to carry out the conductivity measurement.
This arrangement has the advantage that the amount of
20 liquid added to the container corresponds accurately to the amount of powdered material in the container and is not dependent on the accuracy of delivery of a given -* weight of material to the container. The source of error in delivering material to the container is thus
25 avoided.
An example of the invention will now be described with
reference to the accompanying drawings in which :
Figure 1 is a schematic side elevation of conductivity measuring apparatus and
Figure 2 is a diagram of connections of the apparatus of Figure 1 with a microprocessor.
A strain gauge 12 has a measuring head 31 supporting an aluminium seating disc 32. Supported on the disc 32 is a polypropylene vessel 11 of 250 ml capacity. A powder fill funnel 17 has a closeable outlet 33 for feeding material into the vessel 11. A fluid supply
16 extends into the top of the container 11 and is formed with a spray outlet. A 24 volt d.c. electric motor 14 drives a stirrer bl'ade 13 at the base of the container 11 at about 1000 r.p. . by means of a gearbox 15 and a bearing housing 34- A sensor probe 27 extends into the container 11 to measure the electrical conductivity of the container contents. An extract conduit 21 extends from the base of the container 11 to a 24 volt peristaltic pump 22 leading to an analyzer conduit 23 and a drain conduit 24, each conduit being controlled by a respective pinch valve 25 and 26.
A microprocessor, indicated diagrammatically in Figure 2, controls the sequence of operation of the apparatus illustrated in Figure 1. The microprocessor receives inputs from the strain gauge 12 and the output of the conductivity sensor 27- When the empty container 11 is placed on the strain gauge, a reading of its weight is fed into the microprocessor. The valved outlet 33 of the funnel 11 is opened to supply a quantity of powder material to the container and then closed again and a second reading of the container weight is supplied by the strain gauge 12 to the microprocessor. The difference of the two readings corresponds to the weight
of the powder material fed into the container 11 and the microprocessor calculates from a predetermined formula the quantity of fluid to be added to the powdered material through the conduit 16 from a supply of heated liquid through a pinch valve 3 .
The microprocessor receives conductivity readings from the sensor 27 and compares each reading with preceding reading to determine when the output becomes constant. The constant reading is compared with a standard in the microprocessor. If the comparison is within a certain tolerance, the pump 22 is energized and the pinch valve 25 is opened to transfer the contents of the container 11 to the analyzer along conduit 23- If the comparison indicates that the reading is not within the allowed tolerance, the contents of the container 11 are fed to the drain conduit 24 by energizing the pump 22 and opening the pinch valve 26.
The container 11 is prepared for further analysis by rincing with a solvent from the conduit 16 and draining the rinsing solvent through the conduit 21, pump 22 and conduit 24-
The microprocessor has a liquid crystal display 37 to indicate the readings made and the various stages of the operation.
The devices for performing the various steps in the conductivity measurement illustrated in Figure 1 are by way of example only, and could be replaced by components of similar function.
Claims
1. A method of measuring the conductivity of a mixture of a liquid and powdered material comprising weighing a container, adding a quantity of powdered material to the container, weighing the container again to ascertain the weight of the added material, calculating from a predetermined formula the amount liquid required to be added to the ascertained weight of added material, adding the calculated amount of liquid to the container and mixing it with the powdered material and measuring the conductivity of the mixture.
2. A method as claimed in Claim 1 comprising repeatedly measuring the conductivity of the mixture and when the measurements have become constant comparing the constant measurement with a standard, and transferring the contents of the container to an analyzer or to a drain according to the comparison.
3. A method as claimed in Claim 1 or Claim 2 comprising adding the calculated amount of liquid to the container through a spray outlet to facilitate mixing with the powdered material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8516822 | 1985-07-03 | ||
| GB858516822A GB8516822D0 (en) | 1985-07-03 | 1985-07-03 | Measuring conductivity of suspension |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0227785A1 true EP0227785A1 (en) | 1987-07-08 |
Family
ID=10581721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19860904321 Pending EP0227785A1 (en) | 1985-07-03 | 1986-07-03 | Measuring conductivity of a suspension |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0227785A1 (en) |
| GB (1) | GB8516822D0 (en) |
| WO (1) | WO1987000284A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4928065A (en) * | 1989-03-31 | 1990-05-22 | E. I. Du Pont De Nemours And Company | Voltammetry in low-permitivity suspensions |
| US5235526A (en) * | 1990-11-27 | 1993-08-10 | Solomat Limited | Multi-probed sonde including microprocessor |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT262126B (en) * | 1965-06-28 | 1968-05-27 | Ammann U Maschf Ag | Process for the batch production of fresh concrete and equipment for carrying out the process |
| GB1390629A (en) * | 1971-12-08 | 1975-04-16 | Lafarge Ciments Sa | Process and device for controlling the operation of a kiln |
| FR2435703A1 (en) * | 1978-06-27 | 1980-04-04 | Lafarge Ciments Sa | WEIGHING DEVICE AND INSTALLATION COMPRISING SUCH A DEVICE, IN PARTICULAR FOR THE TITRATION OF A POWDERY MATERIAL IN PARTICULAR A CEMENT GROWTH |
| FR2430012A1 (en) * | 1978-06-27 | 1980-01-25 | Lafarge Ciments Sa | ANALYSIS REACTOR AND ITS APPLICATION TO THE ANALYSIS OF A POWDER MATERIAL SAMPLE |
-
1985
- 1985-07-03 GB GB858516822A patent/GB8516822D0/en active Pending
-
1986
- 1986-07-03 EP EP19860904321 patent/EP0227785A1/en active Pending
- 1986-07-03 WO PCT/GB1986/000438 patent/WO1987000284A1/en unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8700284A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1987000284A1 (en) | 1987-01-15 |
| GB8516822D0 (en) | 1985-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KAY, JOSEPH, BRIAN |