GB637738A - Humidity responsive circuit - Google Patents
Humidity responsive circuitInfo
- Publication number
- GB637738A GB637738A GB13454/47A GB1345447A GB637738A GB 637738 A GB637738 A GB 637738A GB 13454/47 A GB13454/47 A GB 13454/47A GB 1345447 A GB1345447 A GB 1345447A GB 637738 A GB637738 A GB 637738A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistor
- thermistor
- hygroscopic
- resistance
- circuit
- 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)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
637,738. Humidity measuring. BENDIX AVIATION CORPORATION. May 19, 1947, No. 13454. Convention date, June 6, 1946. [Class 40 (i)] A hygroscopic resistance is compensated for ambient temperature by connecting it in circuit with a resistance (thermistor) having a similar sloping negative temperature-resistance characteristic. Four circuit arrangements are shown. In one arrangement the hygroscopic resistance 12, and thermistor 16 are connected in series with an indicator 18, and supplied through a potentiometer 22 from a D.C. source. Alternatively the indicator meter may be connected across either the hygroscopic resistor or the thermistor, Fig. 5 (not shown), or the thermistor may form the lower arm of a potential divider supplying the hygroscopic resistor, Fig. 4 (not shown). In a further arrangement the thermistor 54, and hygroscopic resistor 56 are arranged in adjacent arms of bridge circuit with a fixed resistor 52 and a calibrated resistor 58 in the other arms and an indicating or control device such as a polarized relay 60 connected to the balance points. With an electrolytic film type hydroscopic resistor which has a complex impedance and an A.C. supply, a capacitor may be required in parallel with the resistor 58 to obtain balance.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US637738XA | 1946-06-06 | 1946-06-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB637738A true GB637738A (en) | 1950-05-24 |
Family
ID=22051406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13454/47A Expired GB637738A (en) | 1946-06-06 | 1947-05-19 | Humidity responsive circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB637738A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3059178A (en) * | 1959-08-05 | 1962-10-16 | K P Mundinger G M B H | Hygrometer |
| US3440530A (en) * | 1966-11-22 | 1969-04-22 | Molecular Electronics Inc | Method and apparatus for measuring the resistance of an electrical component which may be shunted by a semiconductor device |
-
1947
- 1947-05-19 GB GB13454/47A patent/GB637738A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3059178A (en) * | 1959-08-05 | 1962-10-16 | K P Mundinger G M B H | Hygrometer |
| US3440530A (en) * | 1966-11-22 | 1969-04-22 | Molecular Electronics Inc | Method and apparatus for measuring the resistance of an electrical component which may be shunted by a semiconductor device |
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