GB1127898A - Improvements in or relating to hygrometers - Google Patents

Improvements in or relating to hygrometers

Info

Publication number
GB1127898A
GB1127898A GB1182866A GB1182866A GB1127898A GB 1127898 A GB1127898 A GB 1127898A GB 1182866 A GB1182866 A GB 1182866A GB 1182866 A GB1182866 A GB 1182866A GB 1127898 A GB1127898 A GB 1127898A
Authority
GB
United Kingdom
Prior art keywords
measuring
bridge
milli
resistances
march
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
GB1182866A
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.)
Transbeton S A
Original Assignee
Transbeton S A
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 Transbeton S A filed Critical Transbeton S A
Publication of GB1127898A publication Critical patent/GB1127898A/en
Expired 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
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/045—Circuits
    • 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

Landscapes

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

Abstract

1,127,898. Measuring moisture content; measuring bridge circuits. TRANSBETON S.A. March 17, 1966 [March 19, 1965], No. 11828/66. Headings G1N and G1U. Apparatus for measuring the moisture content of a solid, liquid or gas comprises an A. C. bridge circuit as shown in which diodes D 1 ,D 2 prevent milli-voltmeter or milli-ammeter V from registering unless the resistance between the measuring electrodes E 1 , E 2 is below a value determined by the resistances R 1 and R 2 . The circuit is particularly intended to control the admission of water to a vat for making concrete and may cut off the water supply automatically when the resistance drops below a certain value. Resistances R 1 , R 1 ', R 1 " are all similar but may have their sliders set to correspond to different hardnesses of concrete. Diode D 2 also limits the power consumption of the bridge, which is advantageous when the A. C. supply is a battery powered transistor oscillator.
GB1182866A 1965-03-19 1966-03-17 Improvements in or relating to hygrometers Expired GB1127898A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH388265A CH433807A (en) 1965-03-19 1965-03-19 Hygrometer

Publications (1)

Publication Number Publication Date
GB1127898A true GB1127898A (en) 1968-09-18

Family

ID=4265515

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1182866A Expired GB1127898A (en) 1965-03-19 1966-03-17 Improvements in or relating to hygrometers

Country Status (3)

Country Link
CH (1) CH433807A (en)
DE (1) DE1673123A1 (en)
GB (1) GB1127898A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2211320A (en) * 1987-10-21 1989-06-28 Tung Kung Chao A soil moisture controller
GB2248301A (en) * 1990-09-12 1992-04-01 Ici Plc Apparatus and method for the detection of changes in the composition of a material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2211320A (en) * 1987-10-21 1989-06-28 Tung Kung Chao A soil moisture controller
GB2248301A (en) * 1990-09-12 1992-04-01 Ici Plc Apparatus and method for the detection of changes in the composition of a material

Also Published As

Publication number Publication date
DE1673123A1 (en) 1970-10-29
CH433807A (en) 1967-04-15

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