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Water Brochure - 5863 KROHNE – 85 years of experience and know-how in the water and wastewater industry.

1921 Company founded as LUDWIG KROHNE & SOHN in Duisburg; production of variable-area flow meters for measuring the flow of air, gases and liquids 1955 The beginning of manufacturing mechanical level indicators for measuring liquids in tanks and containers 1961 The first electro-magnetic flow meter (EMF) for water, wastewater, sludge, etc. 1972 The first EMF with pulsed direct current field excitation/automatic zero point offset for the water and wastewater industry 1978 The first ultrasonic flowmeter for water, district heating, etc. 1979 The first non-analog, but frequency-based elec-tronics for EMFs for improved flow measure-ment of wastewater and sludge