US4066092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus to regulate the pH value or other similar values of a solution
Assignee: Individual
•
Filing: 1976-12-27
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Granted: 1978-01-03
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Expires: 1996-12-27
Abstract
Abstract The invention relates to apparatus for regulating the pH value, or other similar values, of a solution. The apparatus includes an actual value transmitter, a desired value transmitter, a regulator controlled by the two transmitters, and a servo unit controlled by the regulator for adding a measured amount of additive to the solution. The servo unit includes a pulse driven metering pump to provide the supply of additive. The applied pulse frequency has a logarithmic relationship to the control signal derived from an error signal which makes possible exact regulation corresponding to the logarithmetic relationship between the pH value and the concentration of additive introduced into the solution.
Inventors
- 👤 Viktor Dulger
- 👤 Franz Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:11
CPC Classifications
G; G05; G05D; G05D21/00; G05D21/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2499; Y10T137/2509
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
Apparatus to regulate the pH value or other similar values of a solution comprising, an actual value transmitter, a desired value transmitter, a regulator controlled by said two transmitters for generating an error signal, pulse generator driven by said regulator for generating a control signal, a servo unit for adding controlled quantities of additive to said solution, said servo unit containing a metering pump for adding an additive, said pump being driven by pulses from said pulse generator, and the pulse frequency of said pulse generator bearing a logarithmic relationship with the amplitude of said error signal generated by the regulator to produce said control signal.
Claim 2
Dependent Claim
106 words
Apparatus to regulate the pH value or other similar values of a solution comprising, an actual value transmitter, a desired value transmitter, a regulator controlled by said two transmitters for generating an error signal, pulse generator driven by said regulator for generating a control signal, a servo unit for adding controlled quantities of additive to said solution, said servo unit containing a metering pump for adding an additive, said pump being driven by pulses from said pulse generator, and the pulse frequency of said pulse generator bearing a logarithmic relationship with the amplitude of said error signal generated by the regulator to produce said control signal.
Claim 3
Dependent Claim
38 words
Apparatus as claimed in claim 1 wherein said pulse generator is a voltage controlled oscillator, said regulator being a difference amplifier fed by desired and actual voltages from said transmitters for producing a control voltage for said oscillator.
Claim 4
Dependent Claim
13 words
Apparatus as claimed in claim 2, wherein said oscillator includes a unijunction transistor.
Claim 5
Dependent Claim
83 words
Apparatus as claimed in claim 2 wherein said metering pump includes a stroke diaphragm and said servo unit includes an electromagnet for operating said diaphragm, circuit means having an A.C. voltage source, said circuit means including a thyristor and said electromagnet, a timing unit for transmitting said oscillator control signal to the gate of said thyristor for operating said electromagnet is in circuit with the thyristor and the frequency of said A.C. voltage source being higher than the frequency of said oscillator pulses.
Claim 6
Dependent Claim
43 words
Apparatus as claimed in claim 4 wherein said circuit means includes a bridge rectifier with said A.C. source and said thyristor being in the A.C. circuit thereof and said electromagnet being in the D.C. circuit thereof said thyristor being a twodirection thyristor triode.
Claim 7
Dependent Claim
19 words
Apparatus as claimed in claim 1 including switch means for interchanging the connections of said transmitters with said regulator.
Claim 8
Dependent Claim
43 words
Apparatus as claimed in claim 1 wherein each said error signal higher than a certain preselected value is linked with the maximum frequency of said pulse generator, said preselected value being lower than the range of values generated by said actual value transmitter.
References Cited (Backward Citations)
US3729013A
Cited
US3605775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |