US4306461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Meter incorporating a digital fullscale setting device
Assignee: Emerson Electric Co
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Filing: 1979-10-09
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Granted: 1981-12-22
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Expires: 1999-10-09
Abstract
Abstract A fullscale setting device for a magnetic flowmeter or the like receives a frequency encoded input and divides it by a mixed number having an integral part and a fractional part to produce an output. The mixed number may represent a flow rate which is taken as the fullscale setting, thereby making the fullscale setting independent of the calibration of the flowmeter.
Inventors
- 👤 John C. Grebe, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:35
CPC Classifications
H; H03; H03K; H03K23/00; H03K23/64; H03K23/66; G; G01; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/60; G01F15/00; G01F15/06; G01F15/068; G01F7/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
150 words
In a meter producing an output in the form of a train of pulses having a frequency proportional to a quantity being measured, the improvement comprising a digital fullscale setting device for receiving said train of pulses as an input and producing a second train of pulses having a frequency equal to the frequency of said first train of pulses divided by a selectable number in the form of a mixed number having an integral part I and a fractional part F, said digital fullscale setting device comprising settable means for pre-setting a number N having an integer part I and a fractional part F, and means responsive to said settable means for alternatively producing either an output for each I inputs or an output for each (I+1) inputs through a cycle, the proportion of outputs for each (I+1) inputs in each cycle being equal to said fractional part F.
Claim 2
Dependent Claim
150 words
In a meter producing an output in the form of a train of pulses having a frequency proportional to a quantity being measured, the improvement comprising a digital fullscale setting device for receiving said train of pulses as an input and producing a second train of pulses having a frequency equal to the frequency of said first train of pulses divided by a selectable number in the form of a mixed number having an integral part I and a fractional part F, said digital fullscale setting device comprising settable means for pre-setting a number N having an integer part I and a fractional part F, and means responsive to said settable means for alternatively producing either an output for each I inputs or an output for each (I+1) inputs through a cycle, the proportion of outputs for each (I+1) inputs in each cycle being equal to said fractional part F.
Claim 3
Dependent Claim
76 words
The improvement of claim 1 wherein the fractional part F of said pre-settable means comprises at least two decimal places 0.1 F t and 0.01 F h said means responsive to said settable means thereby comprising means for producing an output for each (I+1) inputs (10 F t +F h ) times for each cycle of 100 output pulses, the remaining 100-(10 F t +F h ) output pulses being produced in response to I inputs.
Claim 4
Dependent Claim
62 words
The improvement of claim 1 wherein said fullscale setting device includes a programmable divide by N frequency divider and a programmable fractional rate multiplier, said fractional rate multiplier being responsive to the output of said frequency divider to cause said frequency divider to divide by I+1 a proportion of the time equal to the fractional number entered in said fractional rate multiplier.
Claim 5
Dependent Claim
31 words
The improvement of claim 3 including an adder device, connected between an input to said frequency divider and a selectively programmable means, said rate multiplier being connected to said adder device.
Claim 6
Dependent Claim
18 words
The improvement of claim 1 wherein said selectable number is equal to a maximum rate to be measured.
Claim 7
Dependent Claim
46 words
The improvement of claim 1 wherein said meter is a magnetic flowmeter and said quantity being measured is a flow rate, and wherein the frequency of said first train of pulses is about 100 KHz--1000 KHz when said flow rate is about 30 feet per second.
References Cited (Backward Citations)
US3571728A
Cited
US3895529A
Cited
US3818354A
Cited
US3873814A
Cited
US3950989A
Cited
US4238825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-21 | 1985-06-22 | 1985-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-21 | 1989-06-22 | 1989-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-21 | 1993-06-22 | 1993-12-22 | $7700.00 | Window Closed / Lapsed |