Patent classifications
G
PHYSICS
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G05
CONTROLLING; REGULATING
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G05D
SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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G05D11/02
Controlling ratio of two or more flows of fluid or fluent material
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G05D11/13
characterised by the use of electric means
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G05D11/135
by sensing at least one property of the mixture
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G05D11/138
by sensing the concentration of the mixture, e.g. measuring pH value
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