GB533381A - Improvements in or relating to humidity measuring devices - Google Patents
Improvements in or relating to humidity measuring devicesInfo
- Publication number
- GB533381A GB533381A GB2546239A GB2546239A GB533381A GB 533381 A GB533381 A GB 533381A GB 2546239 A GB2546239 A GB 2546239A GB 2546239 A GB2546239 A GB 2546239A GB 533381 A GB533381 A GB 533381A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- strip
- resistance
- humidity
- muslin
- 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
- 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
- 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 Electric Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
533,381. Humidity measuring devices. NEGRETTI, H. N., NEGRETTI, P. E., and GREGORY, H. SPENCER-. Sept. 8, 1939, No. 25462. [Class 37] A humidity measuring device comprises hygroscopic material intimately incorporated in a piece of textile cellulosic material such as cotton fabric which is interposed between electrodes so that its resistance can be measured. A strip of muslin 1 is clamped at its ends in nickel gauge electrodes 2, 3 and is then boiled for about ten minutes in a 5 per cent. solution of calcium chloride, and dried in a horizontal position so that the hygroscopic substance is deposited uniformly. The strip is then mounted between end rings 4, 5 spaced apart by rods 6. The electrodes 2, 3 are connected to terminals 7 by connecting elements 8 welded to the electrodes. A spring 9 holds the muslin 1 taut. The whole is enclosed in a perforated cylindrical container which is either suspended or supported by a bracket in a room or other space where the humidity is to be determined. The container may have a conical nose so that it may be inserted into a body of material whose moisture content is to be determined. The resistance of the impregnated strip 1 may be measured by connecting it in an A.C. circuit in series with an ammeter. A D.C. measuring instrument responsive to changes in current in the A.C. circuit may be used, e.g. by employing a converter. Alternatively, the resistance constituted by the hygroscopic material may form one arm of a Wheatstone bridge, in which case a second arm may be formed by a similar hygroscopic resistance exposed to the same temperature conditions but not to variable humidity. According to the Provisional Specification, the strip of muslin may be replaced by a thread of cotton for use in restricted areas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2546239A GB533381A (en) | 1939-09-08 | 1939-09-08 | Improvements in or relating to humidity measuring devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2546239A GB533381A (en) | 1939-09-08 | 1939-09-08 | Improvements in or relating to humidity measuring devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB533381A true GB533381A (en) | 1941-02-12 |
Family
ID=10228062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2546239A Expired GB533381A (en) | 1939-09-08 | 1939-09-08 | Improvements in or relating to humidity measuring devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB533381A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2707880A (en) * | 1950-02-18 | 1955-05-10 | Honeywell Regulator Co | Relative humidity measuring apparatus |
| US2733607A (en) * | 1956-02-07 | miller | ||
| US2834201A (en) * | 1948-11-03 | 1958-05-13 | American Instr Company | Apparatus for measuring humidity conditions in materials |
| US2869359A (en) * | 1953-08-18 | 1959-01-20 | Maura Luise Herzfeld | Instrument for measuring the moisture and temperature of soil |
| GB2172999A (en) * | 1985-03-25 | 1986-10-01 | Protimeter Plc | A humidity measurement or control instrument |
-
1939
- 1939-09-08 GB GB2546239A patent/GB533381A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2733607A (en) * | 1956-02-07 | miller | ||
| US2834201A (en) * | 1948-11-03 | 1958-05-13 | American Instr Company | Apparatus for measuring humidity conditions in materials |
| US2707880A (en) * | 1950-02-18 | 1955-05-10 | Honeywell Regulator Co | Relative humidity measuring apparatus |
| US2869359A (en) * | 1953-08-18 | 1959-01-20 | Maura Luise Herzfeld | Instrument for measuring the moisture and temperature of soil |
| GB2172999A (en) * | 1985-03-25 | 1986-10-01 | Protimeter Plc | A humidity measurement or control instrument |
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