US3757576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the quantity of outflow in open canals or the like
Assignee: JC Eckardt AG
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Filing: 1970-12-17
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Granted: 1973-09-11
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Expires: 1990-12-17
Abstract
Abstract An apparatus and a process for measuring the quantity of flowing liquids being discharged in open canals, gutters, partially filled pipes or the like, wherein a measured value is obtained for the flow velocity and the height of the level by measuring the voltage induced in an electromagnetic field by movement of the liquid. Two coils are provided, at least one of which can be switched on or off separately from the other one. The coils are arranged in a cross manner such that the field resultants thereof extend in the flow direction and at right angles thereto, and at least one of the coils is connected so that its polarity can be reversed. The electromagnetic fields are alternately switched vertically for measuring the velocity and horizontally for measuring the level, and then multiplying the measured values with each other.
Inventors
- 👤 J Rolff
- 👤 Marco F Di
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:04
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01C; G01C13/00; G01C13/002; G01C13/006; G01F1/002; G01F23/00; G01F23/22; G01F23/26; G01P; G01P5/00; G01P5/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
100 words
Apparatus for measuring the quantity of outflow of flowing electrically conductive liquid in open canals, channels, gutters, partially filled pipes or the like, comprising electromagnetic field generating means for generating an electromagnetic field in said liquid so that measured values of flow velocity and liquid level can be obtained by measuring a voltage induced in the liquid by the electromagnetic field and the movement of the conductive liquid, measuring means for measuring said voltage induced in said liquid, and means for switching said electromagnetic field generating means so as to alternately generate vertical and then horizontal fields in said liquid.
Claim 2
Dependent Claim
100 words
Apparatus for measuring the quantity of outflow of flowing electrically conductive liquid in open canals, channels, gutters, partially filled pipes or the like, comprising electromagnetic field generating means for generating an electromagnetic field in said liquid so that measured values of flow velocity and liquid level can be obtained by measuring a voltage induced in the liquid by the electromagnetic field and the movement of the conductive liquid, measuring means for measuring said voltage induced in said liquid, and means for switching said electromagnetic field generating means so as to alternately generate vertical and then horizontal fields in said liquid.
Claim 3
Dependent Claim
22 words
Apparatus according to claim 1, wherein said electromagnetic field generating means includes two coils selectively connected to a source of energizing voltage.
Claim 4
Dependent Claim
135 words
Apparatus according to claim 2, wherein time switch means connects one coil with the other coil to said source of energizing voltage by a first switch means to produce, for a period of time, a first field resultant extending in the flow direction, a second switch means operatively connected with the time switch means and the coils and being closed during the measurement of the height of the liquid level, said measuring means including two electrodes receiving the measured voltage, first compensating means controlled by a first reference voltage and being fed with the measured voltage for converting the same into a direct current and supplying the same to a first storage unit via the second switch means for subsequent feeding to a multiplier means and a level indicator by means of a D.C. amplifier.
Claim 5
Dependent Claim
127 words
Apparatus according to claim 3, wherein said first switch means includes means for switching the resultant field normal to the flow direction, second compensating means controlled by a second reference voltage phase-shifted by 90* and being fed with the measured voltage for converting the same into a direct current and supplying the same to the multiplier means with the second switch means being opened by the time switch means, and third switch means being operatively associated with the time switch means, the multiplier means, and a second storage unit, whereby when the second switch means is open, the third switch means is closed so that the producT formed in the multiplier means is fed by means of the second storage unit and an amplifier an outflow recorder.
Claim 6
Dependent Claim
31 words
Apparatus according to claim 4, wherein the two coils are arranged in a crossed manner such that the field resultants thereof extend in the flow direction and at right angles thereto.
Claim 7
Dependent Claim
26 words
Apparatus according to claim 5, wherein at least one of the coils is connected to means for reversing the polarity of the energizing voltage applied thereto.
Claim 8
Dependent Claim
24 words
Apparatus according to claim 6, wherein both coils are connected to means for reversing the excitation current supplied thereto with respect to its polarity.
Claim 9
Dependent Claim
44 words
Apparatus according to claim 1, wherein said measuring means includes electrode means for receiving the measured values and connected to supply the same to electronic storage means, and means is provided for determining the value of the outflow quantity from the stored measured values.
Claim 10
Dependent Claim
22 words
Apparatus according to claim 8, wherein said electromagnetic field generating means includes two coils selectively connected to a source of energizing voltage.
Claim 11
Dependent Claim
31 words
Apparatus according to claim 9, wherein the two coils are arranged in a crossed manner such that the field resultants thereof extend in the flow direction and at right angles thereto.
Claim 12
Dependent Claim
26 words
Apparatus according to claim 10, wherein at least one of the coils is connected to means for reversing the polarity of the energizing voltage applied thereto.
Claim 13
Dependent Claim
24 words
Apparatus according to claim 11, wherein both coils are connected to means for reversing the excitation current supplied thereto with respect to its polarity.
Claim 14
Dependent Claim
19 words
Apparatus according to claim 8, wherein the electrode means consists of only two electrodes for receiving the measured values.
Claim 15
Dependent Claim
23 words
Apparatus according to claim 8, wherein the electrode means is located at least in the zone of the bottom of the measuring path.
Claim 16
Dependent Claim
19 words
Apparatus according to claim 14, wherein the electrode means consists of only two electrodes for receiving the measured values.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |