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The reliable pH analyser system

Halland Instruments AS

Applications overview:

APPLICATION: Automatic pH control in the Gypsum removal process.

Process description:
The facility consists of two tanks, two cooling towers and two thickeners. The pH is controlled automatically in one of the tanks using a controller and a valve which adds spent acid. The purified solution is cooled to separate gypsum by crystallization. The solution then enters two thickeners where gypsum is drained. The pH value is also measured in the thickener.

Number analysers: 2
Flow: 200 to 300 m/h
pH range: 4 - 5 pH


Gypsum removal plant.



Outdoor installation of a model PH-1300 pH analyser after three years of operation