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US4365505A
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Apparatus for determining the gas content of a liquid
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1980-07-02
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Granted: 1982-12-28
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Expires: 2000-07-02
Abstract
Abstract Disclosed are a method of and an apparatus for determining entrained gas content in a liquid, especially a liquid synthetic-resin component adapted to form a foamed or cellular synthetic-resin body. Pressure pulses are applied to the liquid and pressure oscillations therein are detected, the amplitude Δp and/or the phase position of a peak being detected and evaluated to give the gas content. The determination may be used to control the addition of the gas to the liquid and/or can be displayed to permit operator control of the system.
Inventors
- 👤 Emil Holzl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:34
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/44; G01N33/442; G01N7/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
121 words
An apparatus for determining the gas content of a liquid, comprising: pump means for generating a pulsating stream of a gas-containing liquid in a flow channel; detector means disposed at said flow channel downstream of said pump means and responsive to the pulsations in the pulsating stream produced by said pump means for generating an intermediate signal indicative of the pressure-propagating characteristics of the liquid/gas mixture flowing in said channel; electronic processing means connected to said detector means and preprogrammed with at least one characteristic curve for converting said intermediate signal into an output signal corresponding to a predetermined parameter representing the proportion of gas in said liquid; and a load responsive to said output signal connected to said processing means.
Claim 2
Independent Claim
121 words
An apparatus for determining the gas content of a liquid, comprising: pump means for generating a pulsating stream of a gas-containing liquid in a flow channel; detector means disposed at said flow channel downstream of said pump means and responsive to the pulsations in the pulsating stream produced by said pump means for generating an intermediate signal indicative of the pressure-propagating characteristics of the liquid/gas mixture flowing in said channel; electronic processing means connected to said detector means and preprogrammed with at least one characteristic curve for converting said intermediate signal into an output signal corresponding to a predetermined parameter representing the proportion of gas in said liquid; and a load responsive to said output signal connected to said processing means.
Claim 3
Dependent Claim
21 words
An apparatus as defined in claim 1 wherein said load comprises display means for visually indicating the magnitude of said parameter.
Claim 4
Dependent Claim
58 words
An apparatus as defined in claim 1 wherein said channel is connected to an adjustable source of gas to be continuously introduced into the liquid, said load comprising comparison means connected to a control input of said source for varying the rate of gas introduction to compensate for deviations of said output signal from a given set-point value.
Claim 5
Dependent Claim
28 words
An apparatus as defined in claim 1, 2 or 3 wherein said processing means is switchable among a plurality of stored characteristic curves plotted for different mean pressures.
Claim 6
Dependent Claim
17 words
The apparatus defined in claim 1, 2 or 3 wherein said detector means is a piezoelectrical element.
Claim 7
Dependent Claim
17 words
The apparatus defined in claim 1, 2 or 3 wherein said detector means is a strain-gauge element.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |