US4091675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Samplers
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1976-12-29
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Granted: 1978-05-30
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Expires: 1996-12-29
Abstract
Abstract A sampler for taking samples continuously, at a rate proportional to flow, in which the head of liquid is sensed by capacitor probes and a voltage is generated for driving a stepping motor, the stepping motor being used to operate a pump controlling sampling.
Inventors
- 👤 William Jennison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:32
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/10; G01N1/20; G01N1/2035; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/131; G05D11/132
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
192 words
A liquid proportional sampler comprising an insulated electrode capable of being inserted in a flowing liquid and a further electrode forming with the first-mentioned electrode a capacitor with an electrical output which is dependent on the depth of insertion of the electrodes in the flowing liquid; a stepping motor driven pump for continuously taking a sample volume from the liquid; means connected to said electrodes for alternately charging and discharging the capacitance between the electrodes; means connected to said electrodes for converting the charging current of said electrodes into a voltage analogue; means connected to said converting means for raising said voltage analogue to a predetermined power index correlating the depth of insertion of the electrodes and the pressure head of the flowing liquid to produce a flow analogue signal; and means for converting said flow analogue signal into a pulse train to operate the stepping motor so that said pump takes from the flowing liquid a sample volume proportional to the flow of liquid, said means for raising said voltage analogue comprising a logarithmic amplifier and an exponential amplifier and said power index being greater than 1.0 and less than 2.5.
Claim 2
Dependent Claim
192 words
A liquid proportional sampler comprising an insulated electrode capable of being inserted in a flowing liquid and a further electrode forming with the first-mentioned electrode a capacitor with an electrical output which is dependent on the depth of insertion of the electrodes in the flowing liquid; a stepping motor driven pump for continuously taking a sample volume from the liquid; means connected to said electrodes for alternately charging and discharging the capacitance between the electrodes; means connected to said electrodes for converting the charging current of said electrodes into a voltage analogue; means connected to said converting means for raising said voltage analogue to a predetermined power index correlating the depth of insertion of the electrodes and the pressure head of the flowing liquid to produce a flow analogue signal; and means for converting said flow analogue signal into a pulse train to operate the stepping motor so that said pump takes from the flowing liquid a sample volume proportional to the flow of liquid, said means for raising said voltage analogue comprising a logarithmic amplifier and an exponential amplifier and said power index being greater than 1.0 and less than 2.5.
Claim 3
Dependent Claim
34 words
A liquid proportional sampler as claimed in claim 1 wherein the first-mentioned electrode and the further electrode can be inserted together into liquid flowing in a pipe through a single hole in the pipe.
References Cited (Backward Citations)
US3821900A
Cited
US3719081A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |