GB2122759A - Probe for measuring conductivity of a fluid - Google Patents

Probe for measuring conductivity of a fluid Download PDF

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Publication number
GB2122759A
GB2122759A GB08217600A GB8217600A GB2122759A GB 2122759 A GB2122759 A GB 2122759A GB 08217600 A GB08217600 A GB 08217600A GB 8217600 A GB8217600 A GB 8217600A GB 2122759 A GB2122759 A GB 2122759A
Authority
GB
United Kingdom
Prior art keywords
probe
coils
fluid
cores
ptfe
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.)
Withdrawn
Application number
GB08217600A
Inventor
Andrew Shouler Clarkson
Eric Liptrot
Peter Palin
Trevor Strickland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Nuclear Fuels Ltd
Original Assignee
British Nuclear Fuels Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Nuclear Fuels Ltd filed Critical British Nuclear Fuels Ltd
Priority to GB08217600A priority Critical patent/GB2122759A/en
Priority to DE19833320995 priority patent/DE3320995A1/en
Priority to AU15841/83A priority patent/AU1584183A/en
Publication of GB2122759A publication Critical patent/GB2122759A/en
Withdrawn legal-status Critical Current

Links

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
    • G01N27/023—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance where the material is placed in the field of a coil
    • 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
    • G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
    • G01N27/07—Construction of measuring vessels; Electrodes therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/22—Measuring resistance of fluids

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  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

A probe (1) for measuring conductivity of a fluid by means of coupled current between two coils (7) and (8). The probe (1) is protected against corrosive fluid eg hydrogen fluoride by being sheathed in a poly vinylidene fluoride casing (15), (19); (20), (2), (3) and a secondary protection is provided by PTFE wrapping for the cores of the coils and PTFE insulation for cables to the cores. Coils (7), (8) are toroidally wound and are respectively connected to a signal source (4) and a detector (5). <IMAGE>

Description

SPECIFICATION Probes, particularly, but not exclusively for determining conductivity This invention relates to probes, particularly, but not exclusively for determining conductivity.
A known probe for determining conductivity comprises an arrangement of toroidal transformer coils immersed in a solution, conductivity of the solution being determined by measuring the current in a closed loop of solution coupled to the coils.
A difficulty which occurs with the known probe is that it is susceptible to attack by corrosive substances, when used to measure their conductivity. Consequently, the probes tend to break down in use.
An object of the present invention is to tend to provide a probe which is able to operate successfully in an hostile environment.
According to the present invention, a probe for measuring conductivity of a fluid, comprises at least two coils, electrically couplable by the fluid, the probe being characterised in that it is surrounded by a sheath which is impervious to the fluid, and in that components within the probe are sealed from the fluid. Thus, the present invention provides a probe which is not initially susceptible to attack by corrosive fluid, yet even if its sheath should break, the probe can continue to function because of a secondary seal provided by insulation of its internal components.
Preferably, the probe sheath comprises poly vinylidene fluoride (PVDF). Advantageously, cores for the coils are wrapped with poly tetrafluoroethane (PTFE). Conveniently, wires within the probe are sheathed in PTFE insulations.
Preferably, where the sheath for the probe includes a number of separate sections, these sections are welded together.
An embodiment of the present invention will now be described by way of example only, with reference to the accompanying drawings in which: Fig. 1 is a side view of a probe assembly, showing its mounting, Fig. 2 is an incomplete end view of Fig. 1, Fig. 3 is a perspective view of a probe, Fig. 4 shows an arrangement of coil cores within the probe, Fig. 5 shows a core, Fig. 6 shows a mounting member for the cores, and Fig. 7 shows an outer housing for the cores.
Reference is directed firstly to Figs. 1 and 2, in which a conductivity probe is generally indicated by 1, an arm carrying the probe by 2 and a mounting for the arm by 3. A signal source is indicated by 4 and a detector by 5. The probe 1 is welded to the arm 2 and the arm 2 is welded to the mounting 3. The probe, arm and mounting are fabricated from poly vinylidene fluoride (PVDF).
Reference is now directed to Fig. 3, in which the probe can be seen in more detail. The probe includes an exciter coil 7 which is connected to the signal source 4 and a detector coil 8 which is connected to the signal detector 5. A spacer 9 is disposed between the coils 7 and 8. A cylindrical passageway 10 is provided within and between the coils, wherein a fluid medium can enter.
Reference is now directed to Fig. 4, wherein the disposition of the cores 7 and 8 can be more clearly seen. The cores 7 and 8 are fabricated from ferrite.
Reference is now directed to Fig. 5, wherein a poly tetrafluorethene (PTFE) tape wrapping for the core 7 is indicated by 12. A cable winding for the core is indicated by 13. A twisted cable line to the wiring 1 3 is indicated by 14. Each of the cables 14 comprises a conductor which is insulated by a PTFE sheath.
Reference is now directed to Fig. 6, which shows the carrier for the coils 7 and 8 and spacer 9. The carrier is indicated by 1 5 and comprises a tubular portion 16 and a raised end flange 17, which flange is raised higher than the outer diameter of the core.
Reference is now directed to Fig. 7, which shows the outer casing for the coil. The outer casing is indicated by 18 and has a tubular part 1 9 which carries an internal flange 20. The internal diameter of the tubular part 1 9 is greater than the outer diameter of the coils 7 and 8.
The probe is assembled as follows. The ferrite cores are each wrapped with the PTFE tape 12.
The cores are then wound with the cable 13 to complete the coils. The coils 7 and 8 and the spacer 9 are then mounted upon the carrier 1 5.
The outer casing 1 8 is then slid over the coils, and the flange 1 7 welded to the tubular part 19 and the flange 20 welded to the tubular part 1 6.
Wires from the coils pass out through the wall of the outer casing 1 8 and up through the centre of the arm 2. The arm 2 is welded onto the casing 19. The arm 2 can then be welded onto the carrier 3 and the twisted pair cables connected to a respective one of the generator 4 or the detector 5. If necessary, the free space within the arm 2 and probe assembly can be filled with epoxy resin.
From the foregoing, it can be seen that the present invention provides a probe which is entirely sealed within poly vinylidene fluoride, any joints being effected by welding. If, however, the PVDF should break down aliowing ingress of corrosive fluid, such as hydrogen fluoride, then components within the probe are still protected from vapour. The ferrite cores are protected by PTFE wrapping and the cable are protected by sheaths of PTFE.
In view of the foregoing, it can be seen that an improved probe is provided.
Claims
1. A probe for measuring conductivity of a fluid, comprising at least two coils electrically couplable by the fluid, the probe being characterised in that it is surrounded by a sheath which is impervious to the fluid, and in that components within the probe are sealed from the fluid.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Probes, particularly, but not exclusively for determining conductivity This invention relates to probes, particularly, but not exclusively for determining conductivity. A known probe for determining conductivity comprises an arrangement of toroidal transformer coils immersed in a solution, conductivity of the solution being determined by measuring the current in a closed loop of solution coupled to the coils. A difficulty which occurs with the known probe is that it is susceptible to attack by corrosive substances, when used to measure their conductivity. Consequently, the probes tend to break down in use. An object of the present invention is to tend to provide a probe which is able to operate successfully in an hostile environment. According to the present invention, a probe for measuring conductivity of a fluid, comprises at least two coils, electrically couplable by the fluid, the probe being characterised in that it is surrounded by a sheath which is impervious to the fluid, and in that components within the probe are sealed from the fluid. Thus, the present invention provides a probe which is not initially susceptible to attack by corrosive fluid, yet even if its sheath should break, the probe can continue to function because of a secondary seal provided by insulation of its internal components. Preferably, the probe sheath comprises poly vinylidene fluoride (PVDF). Advantageously, cores for the coils are wrapped with poly tetrafluoroethane (PTFE). Conveniently, wires within the probe are sheathed in PTFE insulations. Preferably, where the sheath for the probe includes a number of separate sections, these sections are welded together. An embodiment of the present invention will now be described by way of example only, with reference to the accompanying drawings in which: Fig. 1 is a side view of a probe assembly, showing its mounting, Fig. 2 is an incomplete end view of Fig. 1, Fig. 3 is a perspective view of a probe, Fig. 4 shows an arrangement of coil cores within the probe, Fig. 5 shows a core, Fig. 6 shows a mounting member for the cores, and Fig. 7 shows an outer housing for the cores. Reference is directed firstly to Figs. 1 and 2, in which a conductivity probe is generally indicated by 1, an arm carrying the probe by 2 and a mounting for the arm by 3. A signal source is indicated by 4 and a detector by 5. The probe 1 is welded to the arm 2 and the arm 2 is welded to the mounting 3. The probe, arm and mounting are fabricated from poly vinylidene fluoride (PVDF). Reference is now directed to Fig. 3, in which the probe can be seen in more detail. The probe includes an exciter coil 7 which is connected to the signal source 4 and a detector coil 8 which is connected to the signal detector 5. A spacer 9 is disposed between the coils 7 and 8. A cylindrical passageway 10 is provided within and between the coils, wherein a fluid medium can enter. Reference is now directed to Fig. 4, wherein the disposition of the cores 7 and 8 can be more clearly seen. The cores 7 and 8 are fabricated from ferrite. Reference is now directed to Fig. 5, wherein a poly tetrafluorethene (PTFE) tape wrapping for the core 7 is indicated by 12. A cable winding for the core is indicated by 13. A twisted cable line to the wiring 1 3 is indicated by 14. Each of the cables 14 comprises a conductor which is insulated by a PTFE sheath. Reference is now directed to Fig. 6, which shows the carrier for the coils 7 and 8 and spacer 9. The carrier is indicated by 1 5 and comprises a tubular portion 16 and a raised end flange 17, which flange is raised higher than the outer diameter of the core. Reference is now directed to Fig. 7, which shows the outer casing for the coil. The outer casing is indicated by 18 and has a tubular part 1 9 which carries an internal flange 20. The internal diameter of the tubular part 1 9 is greater than the outer diameter of the coils 7 and 8. The probe is assembled as follows. The ferrite cores are each wrapped with the PTFE tape 12. The cores are then wound with the cable 13 to complete the coils. The coils 7 and 8 and the spacer 9 are then mounted upon the carrier 1 5. The outer casing 1 8 is then slid over the coils, and the flange 1 7 welded to the tubular part 19 and the flange 20 welded to the tubular part 1 6. Wires from the coils pass out through the wall of the outer casing 1 8 and up through the centre of the arm 2. The arm 2 is welded onto the casing 19. The arm 2 can then be welded onto the carrier 3 and the twisted pair cables connected to a respective one of the generator 4 or the detector 5. If necessary, the free space within the arm 2 and probe assembly can be filled with epoxy resin. From the foregoing, it can be seen that the present invention provides a probe which is entirely sealed within poly vinylidene fluoride, any joints being effected by welding. If, however, the PVDF should break down aliowing ingress of corrosive fluid, such as hydrogen fluoride, then components within the probe are still protected from vapour. The ferrite cores are protected by PTFE wrapping and the cable are protected by sheaths of PTFE. In view of the foregoing, it can be seen that an improved probe is provided. Claims
1. A probe for measuring conductivity of a fluid, comprising at least two coils electrically couplable by the fluid, the probe being characterised in that it is surrounded by a sheath which is impervious to the fluid, and in that components within the probe are sealed from the fluid.
2. A probe as claimed in claim 1, in which the probe sheath comprises poly vinylidene fluoride (PVDF).
3. A probe as claimed in claim 1 or 2, in which cores for the coils are wrapped with poly tetrafluorethene (PTFE).
4. A probe as claimed in any one of the preceding claims, in which wires within the probe are sheathed in PTFE insulations.
5. A probe as claimed in any one of the preceding claims, in which where the sheath for the probe includes a number of separate sections, these sections are welded together.
6. A probe substantially as hereinbefore described and as shown in the accompanying drawings.
GB08217600A 1982-06-17 1982-06-17 Probe for measuring conductivity of a fluid Withdrawn GB2122759A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB08217600A GB2122759A (en) 1982-06-17 1982-06-17 Probe for measuring conductivity of a fluid
DE19833320995 DE3320995A1 (en) 1982-06-17 1983-06-10 PROBE, IN PARTICULAR TO MEASURE THE CONDUCTIVITY OF A FLUID
AU15841/83A AU1584183A (en) 1982-06-17 1983-06-16 Conductivity probe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08217600A GB2122759A (en) 1982-06-17 1982-06-17 Probe for measuring conductivity of a fluid

Publications (1)

Publication Number Publication Date
GB2122759A true GB2122759A (en) 1984-01-18

Family

ID=10531117

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08217600A Withdrawn GB2122759A (en) 1982-06-17 1982-06-17 Probe for measuring conductivity of a fluid

Country Status (3)

Country Link
AU (1) AU1584183A (en)
DE (1) DE3320995A1 (en)
GB (1) GB2122759A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212621A (en) * 1987-11-17 1989-07-26 John Edward Baxendale Underwater electric field sensor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8711016U1 (en) * 1987-08-12 1988-09-15 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De
DE19930719A1 (en) * 1999-07-02 2001-01-04 Ephy Mess Ges Fuer Elektro Phy Process for increasing the high voltage strength of sensors and sensor with increased high voltage strength

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB695058A (en) * 1951-05-03 1953-08-05 Fielden Electronics Ltd Improvements relating to the measurement of conductivity of liquids
GB761903A (en) * 1954-04-02 1956-11-21 Wayne Kerr Lab Ltd Improvements in or relating to the measurement of the electrical conductance of liquids
GB776861A (en) * 1953-12-03 1957-06-12 Gkn Group Services Ltd Improvements relating to methods of and means for measuring current density
GB1071229A (en) * 1965-06-25 1967-06-07 Beckman Instruments Inc Conductivity measuring system
GB1085557A (en) * 1965-09-06 1967-10-04 Bissett Berman Corp A system for measuring the electrical conductivity of liquids
GB1396813A (en) * 1972-05-18 1975-06-04 Oki Electri Industry Co Ltd Electromagnetic type measuring apparatus for digitally mea suring electric donductivity
GB1456177A (en) * 1974-04-05 1976-11-17 Citroen Sa Apparatus for measuring the electrical conductivity of a liquid
GB2064127A (en) * 1979-09-26 1981-06-10 Trw Inc Subsea hydrocarbon sensor system

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB695058A (en) * 1951-05-03 1953-08-05 Fielden Electronics Ltd Improvements relating to the measurement of conductivity of liquids
GB776861A (en) * 1953-12-03 1957-06-12 Gkn Group Services Ltd Improvements relating to methods of and means for measuring current density
GB761903A (en) * 1954-04-02 1956-11-21 Wayne Kerr Lab Ltd Improvements in or relating to the measurement of the electrical conductance of liquids
GB1071229A (en) * 1965-06-25 1967-06-07 Beckman Instruments Inc Conductivity measuring system
GB1085557A (en) * 1965-09-06 1967-10-04 Bissett Berman Corp A system for measuring the electrical conductivity of liquids
GB1396813A (en) * 1972-05-18 1975-06-04 Oki Electri Industry Co Ltd Electromagnetic type measuring apparatus for digitally mea suring electric donductivity
GB1456177A (en) * 1974-04-05 1976-11-17 Citroen Sa Apparatus for measuring the electrical conductivity of a liquid
GB2064127A (en) * 1979-09-26 1981-06-10 Trw Inc Subsea hydrocarbon sensor system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212621A (en) * 1987-11-17 1989-07-26 John Edward Baxendale Underwater electric field sensor
GB2212621B (en) * 1987-11-17 1992-08-12 John Edward Baxendale Electric current flux sensor

Also Published As

Publication number Publication date
AU1584183A (en) 1983-12-22
DE3320995A1 (en) 1983-12-22

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Legal Events

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)