GB804421A - Improvements in or relating to means for measuring or controlling the relative humidity of a gaseous atmosphere - Google Patents
Improvements in or relating to means for measuring or controlling the relative humidity of a gaseous atmosphereInfo
- Publication number
- GB804421A GB804421A GB752554A GB752554A GB804421A GB 804421 A GB804421 A GB 804421A GB 752554 A GB752554 A GB 752554A GB 752554 A GB752554 A GB 752554A GB 804421 A GB804421 A GB 804421A
- Authority
- GB
- United Kingdom
- Prior art keywords
- temperature
- potentiometers
- relative humidity
- resistor
- sliders
- 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
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/62—Investigating or analyzing materials by the use of thermal means by investigating moisture content by psychrometric means, e.g. wet-and-dry bulb thermometers
- G01N25/64—Investigating or analyzing materials by the use of thermal means by investigating moisture content by psychrometric means, e.g. wet-and-dry bulb thermometers using electric temperature-responsive elements
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
804,421. Electric measuring systems. ELLIOTT BROS. (LONDON), Ltd. June 15. 1955 [March 15, 1954], No. 7525/54. Class 40 (1), Apparatus for determining the relative humidity of an atmosphere comprises a bridge (Fig. 1) having a resistor 3 sensitive to the dry temperature in one arm, a resistor 2 sensitive to the wet temperature in an adjacent arm, the remaining arms containing fixed resistors 6, 7, and the two branches being interconnected by potentiometers 1, 4, the unbalance current being taken from the sliders 8, 5 of the potentiometers and causing a motor 10 to drive the slider 8 of potentiometer 1 to balance the bridge, it being shown that when a specified relationship exists between the resistances in the circuit the position of slider 8 at balance is indicative of the relative humidity when the slider 5 is manually located in accordance with the ambient dry temperature, or a relative humidity value which is to be maintained constant. The movements of sliders 8, 5 are stated to be linearly related for small variations in temperature, so that both sliders may be driven by the motor 10 if the potentiometers are correctly proportioned, to obtain automatic compensation for small temperature variations. To obtain more accurate temperature compensation the potentiometers may be non-linear, and variable resistors may be introduced in series with the temperature-sensitive resistors 2, 3 whose values can be adjusted in accordance with the ambient temperature manually or automatically by a secondary, temperaturemeasuring bridge. In an alternative arrangement (Fig. 3) resistor 4 is replaced by variable resistor 14, which is also manually or automatically adjusted in accordance with the ambient temperature. The humidity of a number of different gases may be measured using separate bridges with common potentiometers 1, 14 connected to measure the humidity of the desired gas by a multiple switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB752554A GB804421A (en) | 1954-03-15 | 1954-03-15 | Improvements in or relating to means for measuring or controlling the relative humidity of a gaseous atmosphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB752554A GB804421A (en) | 1954-03-15 | 1954-03-15 | Improvements in or relating to means for measuring or controlling the relative humidity of a gaseous atmosphere |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB804421A true GB804421A (en) | 1958-11-12 |
Family
ID=9834800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB752554A Expired GB804421A (en) | 1954-03-15 | 1954-03-15 | Improvements in or relating to means for measuring or controlling the relative humidity of a gaseous atmosphere |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB804421A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3139085A (en) * | 1959-09-02 | 1964-06-30 | Arthur C Custance | Method for determining sweat rate |
| US3161056A (en) * | 1961-01-25 | 1964-12-15 | Gen Electric | Moisture indicator |
| FR2175557A1 (en) * | 1972-03-14 | 1973-10-26 | Flam Joseph | |
| US4261059A (en) * | 1979-01-29 | 1981-04-14 | Louis Spitz | Inclement environment jacket and vest garment |
-
1954
- 1954-03-15 GB GB752554A patent/GB804421A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3139085A (en) * | 1959-09-02 | 1964-06-30 | Arthur C Custance | Method for determining sweat rate |
| US3161056A (en) * | 1961-01-25 | 1964-12-15 | Gen Electric | Moisture indicator |
| FR2175557A1 (en) * | 1972-03-14 | 1973-10-26 | Flam Joseph | |
| US4261059A (en) * | 1979-01-29 | 1981-04-14 | Louis Spitz | Inclement environment jacket and vest garment |
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