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US 4,095,272 AGranted
Automatic turbidimetric titration
AssigneePhillips Petroleum Company
InventorG. Jay Janzen
Life of this patent
Estimating the term…
Abstract
The turbidity of the medium being titrated is continuously measured and an analog signal representative thereof is differentiated. The resulting first derivative signal is compared with a reference signal to produce a control signal when the derivative signal has a predetermined relationship to the reference signal. A titration end point signal, representative of the amount of titrant added to the medium being titrated in order to achieve said predetermined relationship, is produced responsive to said control signal.
Claims12
Automatic turbidimetric titration apparatus comprising
- means adapted to contain a liquid medium to be titrated;
- titrant supply means adapted to introduce a turbidimetric titrant into said medium at a gradual rate;
- optoelectronic means adapted to produce an analog measurement signal representative of the turbidity of the medium being titrated;
- differentiating means adapted to produce, responsive to said analog measurement signal, a differentiated signal representative of the first derivative of said analog measurement signal;
- means adapted to compare said differentiated signal with a reference signal and to produce a control signal when said differentiated signal has a predetermined relationship with said reference signal, said predetermined relationship being representative of the occurrence of the titration end-point;
- and
- means responsive to said control signal adapted to produce a titration end-point signal representative of the amount of said titrant added to the medium being titrated in order to achieve said predetermined relationship between said reference signal and said differentiated signal.
4 more elements
A method for turbidimetric titration comprising:
- introducing a liquid medium to be titrated into a titration zone;
- thereafter introducing a turbidimetric titrant into said medium at a gradual rate;
- continuously measuring the turbidity of the medium being titrated and establishing an analog measurement signal representative thereof;
- producing responsive to said analog measurement signal, a differentiated analog signal representative of the first derivative of said analog measurement signal;
- comparing said differentiated analog signal with a reference signal and producing a control signal when said differentiated analog signal has a predetermined relationship with said reference signal, said predetermined relationship being representative of the occurrence of the titration end-point;
- and
- producing, responsive to said control signal, a titration end-point signal representative of the amount of said titrant added to the medium being titrated in order to achieve said predetermined relationship between said reference signal and said differentiated analog signal.
4 more elements
Dependencies are inferred from the claim text.