GB1011710A - Electrical transmitters for industrial process instrumentation systems - Google Patents
Electrical transmitters for industrial process instrumentation systemsInfo
- Publication number
- GB1011710A GB1011710A GB3826463A GB3826463A GB1011710A GB 1011710 A GB1011710 A GB 1011710A GB 3826463 A GB3826463 A GB 3826463A GB 3826463 A GB3826463 A GB 3826463A GB 1011710 A GB1011710 A GB 1011710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- field effect
- effect transistors
- measurement signal
- over
- function
- 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
- 238000004519 manufacturing process Methods 0.000 title 1
- 230000005669 field effect Effects 0.000 abstract 3
- 238000000034 method Methods 0.000 abstract 3
- 238000005259 measurement Methods 0.000 abstract 2
- 230000006698 induction Effects 0.000 abstract 1
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
- G01F1/56—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 electric or magnetic effects
- G01F1/58—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 electric or magnetic effects by electromagnetic flowmeters
- G01F1/60—Circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
- Measuring Volume Flow (AREA)
Abstract
1, 011, 710. Measuring flow. FOXBORO CO. Sept. 27, 1963 [Oct.19, 1962], No. 38264/63. Heading G1N. [Also in Division H3] In a process instrumentation system in which a sensing means e.g. an induction flow meter 12 uses an A.C. power source to produce an A.C. measurement signal which is a function of both the process condition and variations in the power supply, variable attenuators, which may be field effect transistors, having pure resistance at least over a limited range are controlled by the said measurement signal to change simultaneously the flow of A.C. and D.C. current through a load resistor 54 from sources 66, 60 whereby a D.C. signal which is purely a function of the process condition is produced at terminals 76, 78 and an alternating current to null the flowmeter output is applied to transformer 20 over a phase adjusting network 70 and line 21. Amplifier 24, which has a high gain and is not responsive to signals in phase quadrature, provides two outputs in antiphase to a pair of phase sensitive rectifiers 32, 34 and the rectifier outputs are applied to control the attenuation of field effect transistors 41, 43 the working points of which are preset by variable bias sources 36, 38. Photo diodes, thermistors, or magneto resistive devices with their appropriate circuitry may be used in place of the field effect transistors. Specification 921,313 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23171162A | 1962-10-19 | 1962-10-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1011710A true GB1011710A (en) | 1965-12-01 |
Family
ID=22870359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3826463A Expired GB1011710A (en) | 1962-10-19 | 1963-09-27 | Electrical transmitters for industrial process instrumentation systems |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1285057B (en) |
| GB (1) | GB1011710A (en) |
-
1963
- 1963-09-27 GB GB3826463A patent/GB1011710A/en not_active Expired
- 1963-10-18 DE DE1963F0041029 patent/DE1285057B/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1285057B (en) | 1968-12-12 |
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