Apparatus to regulate the pH value or other similar values of a solution
OwnerViktor Dulger, Franz Ernstinventors
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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.
Claims7
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.
Dependencies are inferred from the claim text.