GB1403517A - Calibration of humidity meters - Google Patents
Calibration of humidity metersInfo
- Publication number
- GB1403517A GB1403517A GB1664571A GB1664571A GB1403517A GB 1403517 A GB1403517 A GB 1403517A GB 1664571 A GB1664571 A GB 1664571A GB 1664571 A GB1664571 A GB 1664571A GB 1403517 A GB1403517 A GB 1403517A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sensing element
- switch
- capacitors
- measuring circuit
- parameter
- 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
Links
Classifications
-
- 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
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
1403517 Calibration device MOLECULAR CONTROLS Ltd 22 Aug 1972 [24 May 1971] 16645/71 Heading G1U A device for use in calibrating a meter (e.g. a humidity meter) of the type that includes both a sensing element whose electrical capacitance varies in accordance with the parameter being measured, and a measuring circuit, is such that when it is connected to the measuring circuit in place of the sensing element any one of a plurality of pre-set capacitors can be selected by a switch and connected directly to the measuring circuit so as to simulate the capacitance of the sensing element for a particular value of the parameter concerned. The preferred embodiment of the invention includes two capacitors 12, 13, a switch 2, 3, 4 and a coaxial socket 7. By use of the switch either capacitor can be connected across the socket. The capacitors are first adjusted to have a capacitance equal to that which, the sensing element (not shown) would have for specific values of the parameter in question and are then encapsulated 19.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1664571A GB1403517A (en) | 1971-05-24 | 1971-05-24 | Calibration of humidity meters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1664571A GB1403517A (en) | 1971-05-24 | 1971-05-24 | Calibration of humidity meters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1403517A true GB1403517A (en) | 1975-08-28 |
Family
ID=10081055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1664571A Expired GB1403517A (en) | 1971-05-24 | 1971-05-24 | Calibration of humidity meters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1403517A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001029556A1 (en) * | 1999-10-21 | 2001-04-26 | Johnson Controls Technology Company | Humidity detector calibration method |
| CN113049650A (en) * | 2021-03-25 | 2021-06-29 | 河北工业大学 | Intelligent calibration system and method for soil humidity sensor |
-
1971
- 1971-05-24 GB GB1664571A patent/GB1403517A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001029556A1 (en) * | 1999-10-21 | 2001-04-26 | Johnson Controls Technology Company | Humidity detector calibration method |
| CN113049650A (en) * | 2021-03-25 | 2021-06-29 | 河北工业大学 | Intelligent calibration system and method for soil humidity sensor |
| CN113049650B (en) * | 2021-03-25 | 2023-08-18 | 河北工业大学 | Intelligent calibration system and calibration method for soil humidity sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3119267A (en) | Capacitance measuring apparatus | |
| US3284709A (en) | Precision voltmeter using selectable series connected, digitally related resistors which are calibrated to read the value of input signal | |
| US3183705A (en) | Temperature or pressure measuring apparatus | |
| US3034044A (en) | Electrical bridge | |
| US3135916A (en) | Apparatus for measuring small capacitance values independent of stray capacitance | |
| US3036464A (en) | Electronic thermometer | |
| GB1263673A (en) | Improvements in or relating to resistance bridge circuits | |
| GB1403517A (en) | Calibration of humidity meters | |
| US3593118A (en) | Apparatus for measuring the electrical conductivity of liquids having dielectric-faced electrodes | |
| GB1320814A (en) | Cable fault detection circuit arrangements | |
| US2689479A (en) | Humidity measuring apparatus | |
| US4462250A (en) | Grain moisture meter | |
| SU138398A1 (en) | Capacitive sensor to moisture meter | |
| GB1234467A (en) | ||
| SU459743A1 (en) | Complex dielectric permittivity meter | |
| GB835817A (en) | Resistance unit for use in a clinical thermometer | |
| SU411398A1 (en) | ||
| SU568898A1 (en) | Quasi-bridge resistance meter | |
| SU676946A1 (en) | Complex impedance remote-measuring device | |
| ES429921A1 (en) | Circuit provision for the comparative measurement of resistance, mainly resistance, mainly insulating resistance. (Machine-translation by Google Translate, not legally binding) | |
| ES408408A1 (en) | Electrical circuitry for providing a measure of frequency of a cyclically varying input signal | |
| KR850700072A (en) | Method and apparatus for angle detection and calculation of large rotating alternator under load | |
| SU805202A1 (en) | Device for inspection of dc circuit insulation resistance | |
| SU1126884A1 (en) | Meter of electric values (its versions) | |
| JPS5531913A (en) | Moisture measuring circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |