US3779069A
Expired / Lapsed
US
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Chromatographic apparatus and method
Assignee: PETROCHEM KOM SCHWEDT VEB
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Filing: 1971-01-04
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Granted: 1973-12-18
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Expires: 1991-01-04
Abstract
Abstract A gas chromatograph for analyzing specimens from a chemicalprocess line is triggered by a pneumatic sawtooth generator. The output signal is delivered to the recorder directly and through control, regulating and computing elements, all operating with pneumatic, rather than electrical, signals. The process regulator is likewise of the pneumatic type.
Inventors
- 👤 G Berthold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:26
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/86; G01N30/8651; G01N30/62; G01N30/88; G01N30/8603; G01N30/8606; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86389; Y10T137/86405; Y10T137/86413
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
147 words
A method of operating a gas chromatograph having a chromatographic column, sampling means for passing a sample of gas containing a plurality of components through said column and detector means for providing an output responsive to the presence of the respective components, said method comprising the steps of: generating a timing chain of pressure pulses; pneumatically triggering said sampling means with said pressure pulses; transforming said output into a pressure magnitude; pneumatically storing peaks of said pressure magnitude in the cadence of said pulses in the form of storage pressures; and recording at least said storage pressures, said timing chain of pressure pulses being generated by repeatedly building up a pneumatic pressure level by integrating a pressure signal of constant value, sensing the buildup magnitude and venting the same to the atmosphere upon the buildup magnitude attaining a predetermined threshold level, thereby generating a pneumatic sawtooth sequel.
Claim 2
Independent Claim
147 words
A method of operating a gas chromatograph having a chromatographic column, sampling means for passing a sample of gas containing a plurality of components through said column and detector means for providing an output responsive to the presence of the respective components, said method comprising the steps of: generating a timing chain of pressure pulses; pneumatically triggering said sampling means with said pressure pulses; transforming said output into a pressure magnitude; pneumatically storing peaks of said pressure magnitude in the cadence of said pulses in the form of storage pressures; and recording at least said storage pressures, said timing chain of pressure pulses being generated by repeatedly building up a pneumatic pressure level by integrating a pressure signal of constant value, sensing the buildup magnitude and venting the same to the atmosphere upon the buildup magnitude attaining a predetermined threshold level, thereby generating a pneumatic sawtooth sequel.
Claim 3
Dependent Claim
41 words
The method defined in claim 1, further comprising the step of pneumatically storing a pressure magnitude representing the zero level of the chromatogram developed by said detector means, and pneumatically adding said pressure magnitudes prior to recording of said storage pressures.
Claim 4
Dependent Claim
20 words
The method defined in claim 1, further comprising the step of pneumatically integrating said storage pressures prior to recording same.
Claim 5
Dependent Claim
83 words
The method defined in claim 3, further comprising the step of integrating the pressure magnitude corresponding to all of said components to produce a first stored integrated signal and integrating the pressure magnitude corresponding to a selected one of said components to produce a second stored signal, said stored signals being in the form of said storage pressures, and multiplicatively combining said stored signals to provide an output corresponding to the ratio of said one of said components to all of said components.
Claim 6
Dependent Claim
33 words
The method defined in claim 4, further comprising the step of storing a zero-point signal of the output of said detector means and modifying the stored signals in accordance with said zero-point signal.
Claim 7
Dependent Claim
21 words
The method defined in claim 1, further comprising the step of controlling a process line in response to said storage pressures.
Claim 8
Independent Claim
252 words
An apparatus for the chromatographic analysis of a gas mixture consisting of a plurality of components, comprising: gas-chromatographic means including a chromatographic column, pneumatically actuatable sampling means for passing quantities of said gas mixture through said column for resolution thereby into said components, and detector means responsive to said components for producing an output representing the passage of same; a pneumatic timer for producing a train of pressure pulses; indicating means responsive to said detector means for displaying said output; pneumatic switch means responsive to said pressure pulses for operating said sampling means and said indicator means, said indicating means including a pressure recorder, said switch means including a storage element, a pneumatically actuatable gate connected between said detector means and said storage element and at least one pneumatic switch element responsive to a pressure pulse of said train for triggering said gate; a differential element responsive to the rate of change of said output and connected between said switch element and said gate, said switch means including a further storage element responsive to a zero level of said output and a further gate connected between said further storage element and said detector means, a further switch element triggerable by said train of pressure pulses and a short-duration pneumatic pulse generator pneumatically energizable by said further switch element for triggering said further gate, and pneumatic adder means operatively connected to boTh said storage elements for producing a pneumatic output signal representing the algebraic sum of the signals stored in said storage elements.
Claim 9
Independent Claim
252 words
An apparatus for the chromatographic analysis of a gas mixture consisting of a plurality of components, comprising: gas-chromatographic means including a chromatographic column, pneumatically actuatable sampling means for passing quantities of said gas mixture through said column for resolution thereby into said components, and detector means responsive to said components for producing an output representing the passage of same; a pneumatic timer for producing a train of pressure pulses; indicating means responsive to said detector means for displaying said output; pneumatic switch means responsive to said pressure pulses for operating said sampling means and said indicator means, said indicating means including a pressure recorder, said switch means including a storage element, a pneumatically actuatable gate connected between said detector means and said storage element and at least one pneumatic switch element responsive to a pressure pulse of said train for triggering said gate; a differential element responsive to the rate of change of said output and connected between said switch element and said gate, said switch means including a further storage element responsive to a zero level of said output and a further gate connected between said further storage element and said detector means, a further switch element triggerable by said train of pressure pulses and a short-duration pneumatic pulse generator pneumatically energizable by said further switch element for triggering said further gate, and pneumatic adder means operatively connected to boTh said storage elements for producing a pneumatic output signal representing the algebraic sum of the signals stored in said storage elements.
Claim 10
Dependent Claim
96 words
The apparatus defined in claim 7 wherein said pneumatic timer comprises a pneumatic integrating element for building up a pneumatic pressure level, a pneumatically actuatable gate connected to said integrating element and triggerable for venting same to the atmosphere, thereby reducing said level to a low value, a threshold switch element connected to said integrating element for pneumatically triggering said gate upon said level reaching a predetermined threshold value, and a pneumatic relay connected between said integrating element and said switch means for applying said train to the latter in the form of a pneumatic sawtooth.
Claim 11
Dependent Claim
20 words
The apparatus defined in claim 7, further comprising a pneumatic integrating element connected between said gate and said storage element.
Claim 12
Dependent Claim
81 words
The apparatus defined in claim 9, further comprising another integrating element for integrally summing pressure magnitudes corresponding to all of said components, the first-mentioned integrating element producing a pressure output corresponding to the integrated magnitude of only one of said components, another gate connecting said other integrating element with said detector means, another storage element connected to the output of said other integrating element, and means multiplicatively combining the pressure signals of the last-mentioned storage element and the peak-magnitude storage element.
Claim 13
Dependent Claim
28 words
The apparatus defined in claim 7, further comprising a second gate triggerable by said short-duration pulse generator and connected between the first-mentioned storage element and said summing means.
Claim 14
Dependent Claim
18 words
The apparatus defined in claim 11, further comprising process-control means responsive to the output of said summing means.
Claim 15
Dependent Claim
29 words
The apparatus defined in claim 7 wherein said switch element includes means for registering in said storage element a peak magnitude representing only a selected one of said components.
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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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |