GB855294A - Improvements in flow meters and like instruments - Google Patents
Improvements in flow meters and like instrumentsInfo
- Publication number
- GB855294A GB855294A GB1180958A GB1180958A GB855294A GB 855294 A GB855294 A GB 855294A GB 1180958 A GB1180958 A GB 1180958A GB 1180958 A GB1180958 A GB 1180958A GB 855294 A GB855294 A GB 855294A
- Authority
- GB
- United Kingdom
- Prior art keywords
- subject
- thermistors
- zero
- potentiometers
- flow
- 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
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
- G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
Landscapes
- Measuring Volume Flow (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
Abstract
855,294. Electric flow-meters. COOK, H. July 8, 1959 [April 14, 1958], No. 11809/58. Class 40 (1). A flow-meter of the hot wire anemometer/ Wheatstone bridge type which is not subject to zero drift and sensitivity variation with change of ambient temperature comprises a pair of thermistors T1, T2 (Fig. 2), separately heated and subject to the gas flow connected on opposite sides of the bridge to which current is fed through potentiometers P1, P2. These potentiometers are individually adjusted during temperature cycling with zero gas flow until the indicating instrument MA shows a steady zero. A third thermistor T3 subject to the same conditions as T1 and T2 is placed in series with MA. The variable resistor VR2 is adjusted until the indicating instrument MA shows no sensitivity variation with temperature. The positions of the thermistors T1, T2 with respect to the gas jets may be adjusted to compensate for their different sensitivities. Pressure compensation could be applied by means of an adjustable resistance in series with the indicator and driven by an evacuated capsule. The embodiment shown in Fig. 1 is intended for use as a vertical speed indicator wherein the two main thermistors T1, T2 are mounted in a sealed chamber 3 directly opposite two nozzles 1, 2. Nozzle 1 is connected with a heatinsulated container 5, the other nozzle 2 being connected with a tubular static head 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1180958A GB855294A (en) | 1958-04-14 | 1958-04-14 | Improvements in flow meters and like instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1180958A GB855294A (en) | 1958-04-14 | 1958-04-14 | Improvements in flow meters and like instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB855294A true GB855294A (en) | 1960-11-30 |
Family
ID=9993089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1180958A Expired GB855294A (en) | 1958-04-14 | 1958-04-14 | Improvements in flow meters and like instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB855294A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3372590A (en) * | 1965-10-01 | 1968-03-12 | Technology Inc | Thermal flowmeter |
| GB2176292A (en) * | 1985-06-11 | 1986-12-17 | Potterton Int Ltd | Air-flow measuring device and method |
-
1958
- 1958-04-14 GB GB1180958A patent/GB855294A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3372590A (en) * | 1965-10-01 | 1968-03-12 | Technology Inc | Thermal flowmeter |
| GB2176292A (en) * | 1985-06-11 | 1986-12-17 | Potterton Int Ltd | Air-flow measuring device and method |
| GB2176292B (en) * | 1985-06-11 | 1989-07-26 | Potterton Int Ltd | Air-flow measuring device and method |
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