US4888818A
Expired / Lapsed
US
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Method and apparatus for the determination of the setting process in an inorganic aqueous binder system
Assignee: Kraftwerk Union AG
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Filing: 1987-04-28
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Granted: 1989-12-19
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Expires: 2007-04-28
Abstract
Abstract A method for the determination of the setting process in an inorganic aqueous binder system, in that the electrical conductivity is constantly measured in the binder system, in that the variation of the electrical conductivity is differentiated according to time, in that the variation of the first derivative of the conductivity is monitored, and in that the temperature in the binder system is continously measured and the temperature dependence of the electrical conductivity is eliminated by means of the measured temperature values.
Inventors
- 👤 Wolfgang Schmitt
- 👤 Dietmar Bege
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:49
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/38; G01N33/383; G01N27/00; G01N27/02; G01N27/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
105 words
A method for the determination of the setting process in an inorganic aqueous binder system, which comprises, continuously measuring the electrical conductivity in an inorganic aqueous binder system between two electrodes of a conductivity meter, which are disposed opposite each other in the binder system to obtain a chronological variation of the conductivity in the binder system, differentiating according to time said chronological variation of the conductivity to form a first derivative according to time to indicate a change of speed of the variation in conductivity, and monitoring the first derivative of the conductivity to determine progress in the setting process of the binder system.
Claim 2
Independent Claim
105 words
A method for the determination of the setting process in an inorganic aqueous binder system, which comprises, continuously measuring the electrical conductivity in an inorganic aqueous binder system between two electrodes of a conductivity meter, which are disposed opposite each other in the binder system to obtain a chronological variation of the conductivity in the binder system, differentiating according to time said chronological variation of the conductivity to form a first derivative according to time to indicate a change of speed of the variation in conductivity, and monitoring the first derivative of the conductivity to determine progress in the setting process of the binder system.
Claim 3
Dependent Claim
34 words
A method in accordance with claim 1, wherein the temperature in the binder system is continuously measured and the temperature dependence of the electrical conductivity is eliminated by means of the measured temperature values.
Claim 4
Independent Claim
130 words
An apparatus for the determination of the setting process in an inorganic aqueous binder system, comprising, an inorganic binder system to be monitored, a conductivity meter connected with the binder system for continuously measuring the electrical conductivity in the binder system and producing an output signal of the measured values, said conductivity meter comprising two electrodes disposed opposite each other, and said conductivity meter being connected with a differentiating member in which a first derivative of the variation of conductivity according to time is formed from the output of the conductivity meter and the member produces an output signal of the first derivative, and an indicator connected to the differentiating member to receive the output signal of the first derivative for recording the differentiated conductivity variation in the binder system.
Claim 5
Independent Claim
130 words
An apparatus for the determination of the setting process in an inorganic aqueous binder system, comprising, an inorganic binder system to be monitored, a conductivity meter connected with the binder system for continuously measuring the electrical conductivity in the binder system and producing an output signal of the measured values, said conductivity meter comprising two electrodes disposed opposite each other, and said conductivity meter being connected with a differentiating member in which a first derivative of the variation of conductivity according to time is formed from the output of the conductivity meter and the member produces an output signal of the first derivative, and an indicator connected to the differentiating member to receive the output signal of the first derivative for recording the differentiated conductivity variation in the binder system.
Claim 6
Dependent Claim
87 words
An apparatus in accordance with claim 3, wherein a temperature sensor is connected with the binder system to be monitored, and the conductivity meter and the temperature sensor are connected with an analyzing unit, in which the conductivity values are corrected with respect to their dependence on the temperature and the corrected conductivity values are produced as an output signal, said analyzing unit having an output connected to the differentiating member for transmitting a signal thereto representing the conductivity variation independent of temperature of the binder system.
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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) | 1992-12-18 | 1993-06-19 | 1993-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-18 | 1997-06-19 | 1997-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-18 | 2001-06-19 | 2001-12-19 | $7700.00 | Window Closed / Lapsed |