GB697253A - Electrical proximity switches - Google Patents

Electrical proximity switches

Info

Publication number
GB697253A
GB697253A GB800951A GB800951A GB697253A GB 697253 A GB697253 A GB 697253A GB 800951 A GB800951 A GB 800951A GB 800951 A GB800951 A GB 800951A GB 697253 A GB697253 A GB 697253A
Authority
GB
United Kingdom
Prior art keywords
electrode
april
proximity switches
capacity
electrical proximity
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
Application number
GB800951A
Inventor
John Ernest Fielden
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.)
Fielden Electronics Ltd
Original Assignee
Fielden Electronics 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 Fielden Electronics Ltd filed Critical Fielden Electronics Ltd
Priority to GB800951A priority Critical patent/GB697253A/en
Publication of GB697253A publication Critical patent/GB697253A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
    • G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
    • G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
    • G01F23/265—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors for discrete levels

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Discharge Heating (AREA)

Abstract

697,253. Electric tests and measurements. FIELDEN (ELECTRONICS), Ltd. April 4, 1952 [April 6, 1951], No. 8009/51. Addition to 645,732. Class 37. [Also in Group XL (c)] In a modification of the parent Specification wherein a valve is made to stop oscillating when the capacity of an electrode is increased due to the proximity of an object, the change in condition is produced by the level of the material in a container a reaching a fixed electrode b. The resulting increase in the capacity to earth of the electrode b causes valve v to stop oscillating, whereupon relay f energizes, to close an indicating circuit at f<SP>1</SP>, and control circuit at f<SP>2</SP>.
GB800951A 1951-04-06 1951-04-06 Electrical proximity switches Expired GB697253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB800951A GB697253A (en) 1951-04-06 1951-04-06 Electrical proximity switches

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB800951A GB697253A (en) 1951-04-06 1951-04-06 Electrical proximity switches

Publications (1)

Publication Number Publication Date
GB697253A true GB697253A (en) 1953-09-16

Family

ID=9844027

Family Applications (1)

Application Number Title Priority Date Filing Date
GB800951A Expired GB697253A (en) 1951-04-06 1951-04-06 Electrical proximity switches

Country Status (1)

Country Link
GB (1) GB697253A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213439A (en) * 1962-02-16 1965-10-19 Duane E Atkinson Level indicating device with high frequency resonant probe
DE1295050B (en) * 1965-01-21 1969-05-14 Laeis Werke Ag Proximity switch for signaling when a part to be monitored is approaching

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213439A (en) * 1962-02-16 1965-10-19 Duane E Atkinson Level indicating device with high frequency resonant probe
DE1295050B (en) * 1965-01-21 1969-05-14 Laeis Werke Ag Proximity switch for signaling when a part to be monitored is approaching

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