GB821148A - Improvements in apparatus for detecting the presence or absence at a location of a body of material - Google Patents

Improvements in apparatus for detecting the presence or absence at a location of a body of material

Info

Publication number
GB821148A
GB821148A GB2733856A GB2733856A GB821148A GB 821148 A GB821148 A GB 821148A GB 2733856 A GB2733856 A GB 2733856A GB 2733856 A GB2733856 A GB 2733856A GB 821148 A GB821148 A GB 821148A
Authority
GB
United Kingdom
Prior art keywords
rod
level
liquid
control
casing
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
GB2733856A
Inventor
John Dennis Attwell
Bernard Augustine Worswick
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.)
Danks Holding Ltd
Original Assignee
Bailey Meters and Controls 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 Bailey Meters and Controls Ltd filed Critical Bailey Meters and Controls Ltd
Priority to GB2733856A priority Critical patent/GB821148A/en
Publication of GB821148A publication Critical patent/GB821148A/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
    • G01F23/28—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 the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
    • G01F23/296—Acoustic waves
    • G01F23/2966—Acoustic waves making use of acoustical resonance or standing waves
    • G01F23/2967—Acoustic waves making use of acoustical resonance or standing waves for discrete levels

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

821,148. Hopper level control. BAILEY METERS & CONTROLS Ltd. Sept. 6, 1957 [Sept. 6, 1956], No. 27338/56. Class 78 (1). [Also in Groups XVIII and XXXV] Apparatus for indicating the presence or absence at a chosen level of liquid in a tank or a body of material such as sand or coal in a hopper 2 comprises a mild steel rod 5 welded at its mid-point into a hole in a plate 4 which closes an aperture 3 in the container wall at the chosen level, the end of the rod projecting into the container. A mild steel casing 7 is secured to the plate 4 and is of such length that the outer end of the rod 5 projects through an aperture 8 in the end of the casing. A solenoid 9 surrounds a part of the rod within the casing 7 and is energized by an oscillatory electronic amplifying system (see Group XXXV) to vibrate the rod longitudinally at its lowest natural frequency. When the liquid or material level is below that of the rod, the rod vibrates freely at its maximum amplitude and no indicating or control signal current is produced by the amplifying system. When the vibrations are inhibited by the presence of liquid or material at the rod level, a current output from the system actuates a visible or audible high-level alarm or/and initiates control operations connected with the movement of liquid &c., into or out of the container. The rod may also be positioned at a low level and the system modified to give a lowlevel alarm and control. If the level of a material such as wet cement which may adhere to the rod is to be indicated or controlled, the rod is enclosed in a flexible envelope of such thickness that it collapses on to the rod when material is present but otherwise stands clear thereof. Furthermore, the vibrating rod may be disposed above the maximum level of material and be contacted by a rod projecting from a float carried on the material surface when the control level is reached.
GB2733856A 1956-09-06 1956-09-06 Improvements in apparatus for detecting the presence or absence at a location of a body of material Expired GB821148A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2733856A GB821148A (en) 1956-09-06 1956-09-06 Improvements in apparatus for detecting the presence or absence at a location of a body of material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2733856A GB821148A (en) 1956-09-06 1956-09-06 Improvements in apparatus for detecting the presence or absence at a location of a body of material

Publications (1)

Publication Number Publication Date
GB821148A true GB821148A (en) 1959-09-30

Family

ID=10257953

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2733856A Expired GB821148A (en) 1956-09-06 1956-09-06 Improvements in apparatus for detecting the presence or absence at a location of a body of material

Country Status (1)

Country Link
GB (1) GB821148A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949162A1 (en) * 1979-12-06 1981-06-11 Endress U. Hauser Gmbh U. Co, 7867 Maulburg Filling level detector using oscillatory rod - monitors oscillation amplitude to indicate level due to damping effect
GB2152665A (en) * 1984-01-03 1985-08-07 Ae Cds Autoclave Inc Liquid level detection
EP0248995A1 (en) * 1986-06-11 1987-12-16 Eberhard Hermann Level control apparatus
GB2192059A (en) * 1986-06-26 1987-12-31 Electricity Council Method of and apparatus for determining characteristics of a fluid

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2949162A1 (en) * 1979-12-06 1981-06-11 Endress U. Hauser Gmbh U. Co, 7867 Maulburg Filling level detector using oscillatory rod - monitors oscillation amplitude to indicate level due to damping effect
GB2152665A (en) * 1984-01-03 1985-08-07 Ae Cds Autoclave Inc Liquid level detection
EP0248995A1 (en) * 1986-06-11 1987-12-16 Eberhard Hermann Level control apparatus
GB2192059A (en) * 1986-06-26 1987-12-31 Electricity Council Method of and apparatus for determining characteristics of a fluid
GB2192059B (en) * 1986-06-26 1990-08-22 Electricity Council Method of and apparatus for determining characteristics of a fluid

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