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Mixing process water properly

Ensuring product quality through exact water temperature and quantity measurement

To meet the industry's demand for perfect process water conditions, AZO LIQUIDS has developed its own water mixing and dosing unit (WMD). To achieve this goal, the company applies complete heat balance of the entire system, instead of using a simple dosing control system based on a time profile. This integrated solution enables energy conservation and process control within tight tolerances as errors caused by heat loss at pipes, tank walls or in water vessels are compensated for.

water mixing and dosing unit by AZO Liquids

AZO LIQUIDS water mixing and dosing unit in a compact frame.


  • Real time compensation thanks to fast response times of temperature sensors

  • Small footprint of the unit due to compact design of instruments

  • High-quality documentation and 24/7 online access via the Endress+Hauser W@M portal

Dirk Blank, Manager Sales Support at AZO Liquids

The WMD unit is impressive thanks to its flexibility, set point accuracy, compactness and modular design combined with an innovative control unit and software.

Mr. Dirk Blank, Manager Sales Support

Customer challenge

The WMD unit is operated using a wireless WLAN link (Wireless Ethernet Gateway 758-918) and web server via a smart phone or tablet. The control technology implemented includes various dosing valves as well as particularly fast-responding and compact measuring instruments from Endress+Hauser. Compensation of the inlet temperature, which always fluctuates in practical applications, is vital.

Fast response time for real-time compensation

With response times of under one second, the Easytemp TMR35 temperature sensor enables real-time compensation. The Picomag electromagnetic flowmeter measures conductive media flows in the water vessels, which are required for heat quantity balancing. Thanks to the compact design, two temperature sensors and two Picomag devices can be integrated in the WMD unit.