JPS5670449A - Humidity sensor - Google Patents

Humidity sensor

Info

Publication number
JPS5670449A
JPS5670449A JP14813379A JP14813379A JPS5670449A JP S5670449 A JPS5670449 A JP S5670449A JP 14813379 A JP14813379 A JP 14813379A JP 14813379 A JP14813379 A JP 14813379A JP S5670449 A JPS5670449 A JP S5670449A
Authority
JP
Japan
Prior art keywords
humidity
humidity sensor
heater
dew condensation
dew
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.)
Pending
Application number
JP14813379A
Other languages
Japanese (ja)
Inventor
Hiroaki Ueno
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP14813379A priority Critical patent/JPS5670449A/en
Publication of JPS5670449A publication Critical patent/JPS5670449A/en
Pending 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

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)

Abstract

PURPOSE: To enable normal detection of humidity by attaching a heater around a humidity sensor, making the heater operate when the humidity to be detected exceeds a prescribed humidity to prevent the dew condensation on the surface of the temperature sensor, and eliminating the dew condensing before the start of operation in a short time as well.
CONSTITUTION: The heater 2 is provided as an attachment around the humidity sensor 1. When there is no dew condensation on the surface of the humidity sensor 1, the change of the ambient humidity of the humidity sensor 1 into 93%, for instance, brings about the rise of the voltage of a humidity detection signal Sr from a logarithmic transformer 6 to 9.3mV. Since the reference voltage of a comparator 7 is set to be 9.0mV, an output signal is delivered from a time point t1 to make an oscillator 8 oscillate, whereby the 1st timer circuit 9 outputs a control signal Sh to turn a switch circuit SW on and further to make the heaer 2 active. When there is any dew condensation on the surface of the humidity sensor 1, the turning-on of the power source of the humidity detector makes the voltage of the humidity detection signal Sr exceed the reference voltage of 9.0mV since the resistance value is turned small owing to the dew condensation. Accordingly, the heater is made active as mentioned in the above and thereby the dew condensing on the surface of the humidity sensor 1 is dried in a short time.
COPYRIGHT: (C)1981,JPO&Japio
JP14813379A 1979-11-15 1979-11-15 Humidity sensor Pending JPS5670449A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14813379A JPS5670449A (en) 1979-11-15 1979-11-15 Humidity sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14813379A JPS5670449A (en) 1979-11-15 1979-11-15 Humidity sensor

Publications (1)

Publication Number Publication Date
JPS5670449A true JPS5670449A (en) 1981-06-12

Family

ID=15445995

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14813379A Pending JPS5670449A (en) 1979-11-15 1979-11-15 Humidity sensor

Country Status (1)

Country Link
JP (1) JPS5670449A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0594215A1 (en) * 1992-10-23 1994-04-27 RICOH SEIKI COMPANY, Ltd. Drive control apparatus for microsensor
US6641303B2 (en) * 2001-08-31 2003-11-04 Honda Giken Kogyo Kabushiki Kaisha Temperature control system for humidity sensor
EP2261572A1 (en) * 2009-06-11 2010-12-15 Kjærulf Pedersen A/S Humidity sensoring system for storage rooms
US7900374B2 (en) * 2004-08-18 2011-03-08 Lg Electronics Inc. Apparatus for automatically drying and method for controlling the same
CN103207213A (en) * 2013-03-21 2013-07-17 王競逸 Moisture condensation detecting device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0594215A1 (en) * 1992-10-23 1994-04-27 RICOH SEIKI COMPANY, Ltd. Drive control apparatus for microsensor
US6641303B2 (en) * 2001-08-31 2003-11-04 Honda Giken Kogyo Kabushiki Kaisha Temperature control system for humidity sensor
US7900374B2 (en) * 2004-08-18 2011-03-08 Lg Electronics Inc. Apparatus for automatically drying and method for controlling the same
EP2261572A1 (en) * 2009-06-11 2010-12-15 Kjærulf Pedersen A/S Humidity sensoring system for storage rooms
CN103207213A (en) * 2013-03-21 2013-07-17 王競逸 Moisture condensation detecting device

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