NL7500033A - Vochtindicator met twee lampen. - Google Patents

Vochtindicator met twee lampen.

Info

Publication number
NL7500033A
NL7500033A NL7500033A NL7500033A NL7500033A NL 7500033 A NL7500033 A NL 7500033A NL 7500033 A NL7500033 A NL 7500033A NL 7500033 A NL7500033 A NL 7500033A NL 7500033 A NL7500033 A NL 7500033A
Authority
NL
Netherlands
Prior art keywords
lamps
moisture indicator
indicator
moisture
Prior art date
Application number
NL7500033A
Other languages
English (en)
Dutch (nl)
Original Assignee
Diplex Limited
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 Diplex Limited filed Critical Diplex Limited
Publication of NL7500033A publication Critical patent/NL7500033A/xx

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • G01N33/246—Earth materials for water content
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
    • G01R17/10—AC or DC measuring bridges
    • G01R17/16—AC or DC measuring bridges with discharge tubes or semiconductor devices in one or more arms of the bridge, e.g. voltmeter using a difference amplifier
    • 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
    • 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

  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Remote Sensing (AREA)
  • General Health & Medical Sciences (AREA)
  • Food Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Geology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Power Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
NL7500033A 1974-01-02 1975-01-02 Vochtindicator met twee lampen. NL7500033A (nl)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB15674 1974-01-02

Publications (1)

Publication Number Publication Date
NL7500033A true NL7500033A (nl) 1975-07-04

Family

ID=9699390

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7500033A NL7500033A (nl) 1974-01-02 1975-01-02 Vochtindicator met twee lampen.

Country Status (5)

Country Link
US (1) US3979667A (da)
JP (1) JPS50102397A (da)
DE (1) DE2461393A1 (da)
FR (1) FR2256409B3 (da)
NL (1) NL7500033A (da)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5227287U (da) * 1975-08-18 1977-02-25
US4070615A (en) * 1976-05-12 1978-01-24 Tektronix, Inc. Compensation indicator for attenuation probe
JPS5380486U (da) * 1976-12-06 1978-07-04
US4122389A (en) * 1977-05-23 1978-10-24 Tandy Corporation Moisture sensor
US4268824A (en) * 1977-12-09 1981-05-19 Phillips Reed E Plant soil moisture level-signaling device for household and commercial use
DE2855809C2 (de) * 1978-12-22 1980-06-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen Einrichtung zur automatischen Überwachung des Ladezustandes einer netzunabhängigen Stromversorgung und der Luftfeuchte im Antwortgerät einer Anlage zur Standortbestimmung von Verkehrseinrichtungen
AU5728380A (en) * 1979-04-10 1980-10-16 Johnston, Hal Pty. Ltd. Hood for rotary-arm dishwasher
DE3110671A1 (de) * 1981-03-19 1983-03-24 Johnson Service Co., Milwaukee, Wis. Analoge ausgangssignalnzeige
FR2517061A1 (fr) * 1981-11-20 1983-05-27 Mere Malleray Et Cie Indicateur electronique d'arrosage
ES1014088Y (es) * 1990-05-11 1991-07-16 Lopez Rayado Luis Indicador de riego domestico.
US5450012A (en) * 1993-09-15 1995-09-12 Hydro-Quebec Soil electrode assembly for protecting and supporting an electrode member for measuring the resistivity of a volume of the soil
US6700395B1 (en) 2002-04-26 2004-03-02 Betty J. Perry Soil moisture indicator device
DE102005058436A1 (de) * 2005-12-07 2007-06-14 Werner Krachtus Vorrichtung zur Messung und Anzeige der Feuchtigkeit in einem Erdreich
CN102426178A (zh) * 2011-10-08 2012-04-25 黄宇嵩 育秧棚用电桥式湿度指示器
US11243182B2 (en) * 2019-02-05 2022-02-08 AGI Suretrack LLC Moisture soil probe system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3452347A (en) * 1966-11-03 1969-06-24 Eastman Kodak Co Luminous diode battery condition indicator for camera
US3688309A (en) * 1970-09-09 1972-08-29 Herman W Volberg Device for detecting and displaying the response of a tissue to stimuli
US3882383A (en) * 1973-06-07 1975-05-06 Charles Matlin Soil moisture sensing system

Also Published As

Publication number Publication date
DE2461393A1 (de) 1975-11-06
JPS50102397A (da) 1975-08-13
US3979667A (en) 1976-09-07
FR2256409A1 (da) 1975-07-25
FR2256409B3 (da) 1977-09-23

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