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GB668196A - Improvements in or relating to moisture measuring and controlling instruments - Google Patents

Improvements in or relating to moisture measuring and controlling instruments

Info

Publication number
GB668196A
GB668196A GB1910449A GB1910449A GB668196A GB 668196 A GB668196 A GB 668196A GB 1910449 A GB1910449 A GB 1910449A GB 1910449 A GB1910449 A GB 1910449A GB 668196 A GB668196 A GB 668196A
Authority
GB
United Kingdom
Prior art keywords
humidity
relay
valves
relays
relative humidity
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
GB1910449A
Inventor
Frank Howard Taylor
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1910449A priority Critical patent/GB668196A/en
Priority to FR1023867D priority patent/FR1023867A/en
Publication of GB668196A publication Critical patent/GB668196A/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
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/121—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid for determining moisture content, e.g. humidity, of the fluid
    • 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
    • G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
    • G01N27/223—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity
    • G01N27/225—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance for determining moisture content, e.g. humidity by using hygroscopic materials

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 Fluid Adsorption Or Reactions (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

668,196. Electric correspondence control systems. STANDARD TELEPHONES & CABLES, Ltd. July 14, 1950. [July 20, 1949] No. 19104/49. Class 40 (i). [Also in Groups XXXV and XXXVI] A hygrometer to indicate or control the relative humidity in an atmosphere comprises a mass of glass fibres 4 (Figs. 1, 2) between two electrodes 1, 2 the electrical impedance between the electrodes being a function of the surface moisture on the fibres produced by the relative humidity of the atmosphere. The electrode discs 1, 2 are stiffened by ribs 6, and perforated by holes 5 to allow free passage of air to the glass fibres 4. An embodiment of the use of the humidity-sensitive element in a bridge circuit for humidity and temperature control is shown in Fig. 6, wherein the four arms of the bridge are the humidity-sensitive element 28, a tapped resistor 26, 27 and the two halves 21, 22 of the centre-tapped secondary of a mains transformer 23, with a thyratron 31 across one half winding 21, and two thyratrons 32, 33 across the other 22, having relays 34, 35, 36 in the respective anode leads. The grids of the valves are connected so that with low humidity, when element 28 has a high impedance, only valve 31 fires, operating relay 34 ; with increased humidity, when the impedance of element 28 is comparable with that of 26/27, valves 31, 32 will fire alternately, operating relays 34, 35 ; and with high humidity valves 32, 33 will both fire, operating relays 35 and 36. Relay 34 opens a vane to admit moist circulating air, relay 35 closes this vane, and relay 36 operates a heater which lowers the relative humidity by raising the temperature.
GB1910449A 1949-07-20 1949-07-20 Improvements in or relating to moisture measuring and controlling instruments Expired GB668196A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1910449A GB668196A (en) 1949-07-20 1949-07-20 Improvements in or relating to moisture measuring and controlling instruments
FR1023867D FR1023867A (en) 1949-07-20 1950-07-20 Moisture sensitive devices or hygrometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1910449A GB668196A (en) 1949-07-20 1949-07-20 Improvements in or relating to moisture measuring and controlling instruments

Publications (1)

Publication Number Publication Date
GB668196A true GB668196A (en) 1952-03-12

Family

ID=10123848

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1910449A Expired GB668196A (en) 1949-07-20 1949-07-20 Improvements in or relating to moisture measuring and controlling instruments

Country Status (2)

Country Link
FR (1) FR1023867A (en)
GB (1) GB668196A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886682A (en) * 1954-07-24 1959-05-12 British Scient Instr Res Corp Devices for measuring relative humidity
WO2001042776A1 (en) * 1999-12-08 2001-06-14 Sensirion Ag Capacitive sensor
US8633047B2 (en) 2011-09-02 2014-01-21 Sensirion Ag Method for manufacturing a sensor chip

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2886682A (en) * 1954-07-24 1959-05-12 British Scient Instr Res Corp Devices for measuring relative humidity
WO2001042776A1 (en) * 1999-12-08 2001-06-14 Sensirion Ag Capacitive sensor
US6690569B1 (en) 1999-12-08 2004-02-10 Sensirion A/G Capacitive sensor
US8633047B2 (en) 2011-09-02 2014-01-21 Sensirion Ag Method for manufacturing a sensor chip
US9140740B2 (en) 2011-09-02 2015-09-22 Sensirion Ag Sensor chip and method for manufacturing a sensor chip

Also Published As

Publication number Publication date
FR1023867A (en) 1953-03-25

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