Industrial process instrumentation is the field KROHNE Group leads, manufacturing electromagnetic flowmeters (Flexmag 4050C), ultrasonic flowmeters (ALTOSONIC V12), radar level transmitters (the OPTIWAVE 1500 series), pressure transmitters, temperature sensors, and analytical sensors (the OPTISENS series) for oil-and-gas, water-and-wastewater, chemical, food-and-beverage, and marine customers. Founded in 1921 by Ludwig Krohne and headquartered in Duisburg, Germany, it holds ISO 9001, ISO 14001, and SIL certifications and operates in more than 100 countries through 16 production facilities and 44 subsidiaries, among them KROHNE MARSHALL Pvt Ltd in Pune.