ES2608901B1 - Improved humidity sensor - Google Patents

Improved humidity sensor Download PDF

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Publication number
ES2608901B1
ES2608901B1 ES201630987A ES201630987A ES2608901B1 ES 2608901 B1 ES2608901 B1 ES 2608901B1 ES 201630987 A ES201630987 A ES 201630987A ES 201630987 A ES201630987 A ES 201630987A ES 2608901 B1 ES2608901 B1 ES 2608901B1
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Spain
Prior art keywords
humidity
cylinder
humidity sensor
electrical
microcomputer
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Expired - Fee Related
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ES201630987A
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Spanish (es)
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ES2608901A1 (en
Inventor
Ricardo FERNÁNDEZ CUEVAS
José HIDALGO CENALMOR
Diego JIMÉNEZ AMO
Roberto GÓMEZ HIDALGO
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Auscultacion Y Taller De Ingenieria S A
Auscultacion Y Taller De Ingenieria Sa
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Auscultacion Y Taller De Ingenieria S A
Auscultacion Y Taller De Ingenieria Sa
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    • 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

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  • 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

Sensor de humedad perfeccionado que consiste en un sensor capacitivo de humedad, un sensor de temperatura, un multiplexor por división de frecuencia de las señales eléctricas de los sensores de humedad y de temperatura y un microcomputador que digitaliza las dichas señales eléctricas de los sensores de humedad y de temperatura por una conexión eléctrica compatible con RS485, cuyo protocolo de comunicaciones es compatible con Modbus, y una fuente generadora de calor controlada por el referido microcomputador, todos los anteriores componentes junto con sus correspondientes cableados eléctricos y de datos están dispuestos en el interior de un cilindro hueco de material plástico, dicho cilindro dispone en una de sus paredes de un orificio pasante que comunica el interior del referido cilindro con el medio exterior, dicho orificio está cerrado por una membrana impermeable al agua y permeable al vapor de agua de una mezcla de celulosa, plástico y acero inoxidable.Improved humidity sensor consisting of a capacitive humidity sensor, a temperature sensor, a frequency division multiplexer of the electrical signals of the humidity and temperature sensors and a microcomputer that digitizes said electrical signals of the humidity sensors and of temperature by an electrical connection compatible with RS485, whose communication protocol is compatible with Modbus, and a heat generating source controlled by said microcomputer, all the previous components together with their corresponding electrical and data wiring are arranged inside of a hollow cylinder of plastic material, said cylinder has in one of its walls a through hole that communicates the interior of said cylinder with the external means, said hole is closed by a water impermeable and water vapor permeable membrane of a mixture of cellulose, plastic and stainless steel.

Description

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DESCRIPCIONDESCRIPTION

Sensor de humedad perfeccionado Objeto de la invencionImproved humidity sensor Object of the invention

El objeto de la presente invencion es un novedoso sensor de la humedad del medio ambiente capaz de funcionar con una presion de 80 m de columna de agua, de soportar en condiciones optimas una humedad del 100%, que la distancia entre el sensor y la unidad de lectura de las senales que emite es superior a 100 m.The object of the present invention is a novel environmental humidity sensor capable of operating with a pressure of 80 m of water column, to withstand in optimum conditions a humidity of 100%, that the distance between the sensor and the unit The reading of the signals it emits is greater than 100 m.

Antecedentes de la invencionBackground of the invention

Uno de los tipos de sensores de humedad son los sensores capacitivos cuyo funcionamiento se basa en el cambio de capacidad que sufre un condensador en presencia de humedad.One of the types of humidity sensors is capacitive sensors whose operation is based on the change in capacity that a condenser undergoes in the presence of moisture.

Entre los inconvenientes que presentan los sensores de humedad capacitivos existentes en el mercado se puede citar los siguientes: su exposicion prolongada a un ambiente de humedad superior al 95% los destruye o los dana seriamente, suelen no soportar su inmersion en agua, por lo que no se pueden utilizar en obras de ingenieria civil como presas, terraplenes o filtros biologicos, y la distancia existente entre el sensor y su correspondiente unidad de lectura son pequenas debido a las caracteristicas de las senales digitalizadas que generan.Among the disadvantages of the existing capacitive humidity sensors on the market, the following can be mentioned: their prolonged exposure to a humidity environment greater than 95% destroys them or seriously damages them, they usually do not support their immersion in water, so they cannot be used in civil engineering works such as dams, embankments or biological filters, and the distance between the sensor and its corresponding reading unit is small due to the characteristics of the digitized signals they generate.

La presente invencion preconiza un sensor de humedad capacitivo que resuelve de manera sencilla y economica los anteriores inconvenientes.The present invention recommends a capacitive humidity sensor that solves the above inconveniences in a simple and economical way.

Descripcion de la invencionDescription of the invention

El sensor de humedad perfeccionado objeto de la presente invencion consiste en un sensor capacitivo de humedad, un sensor de temperatura, un multiplexor por division de frecuencia de las senales electricas procedentes de los sensores de humedad y de temperatura y un microcomputador que digitaliza las senales electricas procedentes de los susodichos sensores de humedad y de temperatura por una conexion electrica compatible con RS485 y cuyo protocolo de comunicaciones es compatible con Modbus, y una fuente generadora deThe improved humidity sensor object of the present invention consists of a capacitive humidity sensor, a temperature sensor, a frequency division multiplexer of the electrical signals coming from the humidity and temperature sensors and a microcomputer that digitizes the electrical signals from the aforementioned humidity and temperature sensors by an electrical connection compatible with RS485 and whose communication protocol is compatible with Modbus, and a source generating

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calor controlada por el referido microcomputador. Todos los anteriores componentes, junto con sus correspondientes cableados electricos y de datos, estan dispuestos en el interior de un cilindro hueco de material plastico. Dicho cilindro dispone en una de sus paredes de un orificio pasante que comunica el interior del referido cilindro con el medio exterior. Dicho orificio esta cerrado por una membrana impermeable al agua y permeable al vapor de agua fabricada con una mezcla de celulosa, plastico y acero inoxidable.heat controlled by said microcomputer. All of the above components, together with their corresponding electrical and data cabling, are arranged inside a hollow cylinder of plastic material. Said cylinder has in one of its walls a through hole that communicates the interior of said cylinder with the external means. Said hole is closed by a water impermeable and water vapor permeable membrane made of a mixture of cellulose, plastic and stainless steel.

Breve descripcion de las figurasBrief description of the figures

Figura 1: muestra una vista en perspectiva del cilindro hueco.Figure 1: shows a perspective view of the hollow cylinder.

Realizacion preferentePreferred embodiment

Una realizacion preferente del sensor de humedad perfeccionado, que es el objeto de la presente descripcion, consiste en un sensor capacitivo de humedad; un sensor de temperatura; un multiplexor por division de frecuencia de las senales electricas procedentes de los sensores de humedad y de temperatura en un unico hilo y que por lo tanto puede medir con solo tres hilos y a una distancia superior a 100 m entre el sensor y su correspondiente unidad de lectura; y un microcomputador que digitaliza las dichas senales electricas procedentes de los susodichos sensores de humedad y de temperatura por una conexion electrica compatible con RS485, con lo que puede ser interrogado desde una distancia superior a un kilometro, y cuyo protocolo de comunicaciones es compatible con Modbus, en el caso de utilizarse las senales digitalizadas se necesitan cuatro hilos de salida, los dos de alimentacion y los dos del RS485, estas senales son compatibles con las senales analogicas generadas por el multiplexor, necesitandose por tanto la utilization de cinco hilos y una fuente generadora de calor controlada por el referido microcomputador.A preferred embodiment of the improved humidity sensor, which is the object of the present description, consists of a capacitive humidity sensor; a temperature sensor; a frequency division multiplexer of the electrical signals from the humidity and temperature sensors in a single wire and therefore can measure with only three wires and at a distance greater than 100 m between the sensor and its corresponding reading unit ; and a microcomputer that digitizes said electrical signals from the above-mentioned humidity and temperature sensors by an electrical connection compatible with RS485, which can be interrogated from a distance greater than one kilometer, and whose communication protocol is compatible with Modbus , in the case of using the digitized signals, four output wires are needed, the two of supply and the two of the RS485, these signals are compatible with the analog signals generated by the multiplexer, therefore requiring the use of five wires and a source heat generator controlled by said microcomputer.

Los componentes descritos en el parrafo anterior, junto con sus correspondientes cableados electricos y de datos, estan dispuestos en el interior de un cilindro (1) hueco de material plastico, dicho cilindro dispone en una de sus paredes de un orificio pasante que comunica el interior del referido cilindro con el medio exterior, dicho orificio (2) esta cerrado por una membrana (3) impermeable al agua y permeable al vapor de agua fabricada con una mezcla de celulosa, plastico y acero inoxidable, por lo que el sensor de humedad perfeccionado puede funcionar sumergido en agua y sometido a una presion de hasta 80 metros deThe components described in the previous paragraph, together with their corresponding electrical and data cabling, are arranged inside a hollow cylinder (1) of plastic material, said cylinder has in one of its walls a through hole that communicates the interior of said cylinder with the external means, said hole (2) is closed by a membrane (3) impermeable to water and permeable to water vapor made of a mixture of cellulose, plastic and stainless steel, so that the improved humidity sensor it can work submerged in water and subjected to a pressure of up to 80 meters of

columna de agua, y es capaz de seguir funcionando despues de estar sometido a ambientes del 100% de humedad durante largos periodos de tiempo.water column, and is able to continue working after being subjected to 100% humidity environments for long periods of time.

Claims (1)

ES 2 608 901 A1ES 2 608 901 A1 REIVINDICACIONES 1. Sensor de humedad perfeccionado caracterizado por que consiste en un sensor capacitivo de humedad, un sensor de temperatura, un multiplexor por division de frecuencia 5 de las senales electricas procedentes de los sensores de humedad y de temperatura y un microcomputador que digitaliza las dichas senales electricas procedentes de los susodichos sensores de humedad y de temperatura por una conexion electrica compatible con RS485 y cuyo protocolo de comunicaciones es compatible con Modbus, y una fuente generadora de calor controlada por el referido microcomputador, todos los anteriores componentes junto 10 con sus correspondientes cableados electricos y de datos estan dispuestos en el interior de un cilindro hueco de material plastico, dicho cilindro dispone en una de sus paredes de un orificio pasante que comunica el interior del referido cilindro con el medio exterior, dicho orifico esta cerrado por una membrana impermeable al agua y permeable al vapor de agua fabricada con una mezcla de celulosa, plastico y acero inoxidable.1. Improved humidity sensor characterized in that it consists of a capacitive humidity sensor, a temperature sensor, a frequency division multiplexer 5 of the electrical signals coming from the humidity and temperature sensors and a microcomputer that digitizes the said signals electrical sources from the aforementioned humidity and temperature sensors by an electrical connection compatible with RS485 and whose communications protocol is compatible with Modbus, and a heat generating source controlled by the said microcomputer, all the previous components together with their corresponding wiring electrical and data are arranged inside a hollow cylinder of plastic material, said cylinder has in one of its walls a through hole that communicates the inside of the said cylinder with the outside environment, said hole is closed by a membrane impermeable to water and water vapor permeable made with a mixture cellulose, plastic and stainless steel.
ES201630987A 2016-07-20 2016-07-20 Improved humidity sensor Expired - Fee Related ES2608901B1 (en)

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ES201630987A ES2608901B1 (en) 2016-07-20 2016-07-20 Improved humidity sensor

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Application Number Priority Date Filing Date Title
ES201630987A ES2608901B1 (en) 2016-07-20 2016-07-20 Improved humidity sensor

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ES2608901B1 true ES2608901B1 (en) 2018-01-26

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2976090A1 (en) 2022-12-01 2024-07-23 Lluch Antonio Martinez Humidity and temperature measurement equipment inside the walls and the space where the measurement equipment is housed (Machine-translation by Google Translate, not legally binding)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5816704A (en) * 1996-06-04 1998-10-06 Decagon Devices, Inc. Water activity and dew point temperature measuring apparatus and method
WO2000060558A1 (en) * 1999-04-06 2000-10-12 Thornton Associates, Inc. Multiplexing sensor signals
EP1921449A1 (en) * 2006-11-07 2008-05-14 Sensirion AG Device for determining soil moisture content

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