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State-of-the-art measurement cells suitable for highly viscous fluids (mainly gear-measuring cells or Coriolis measuring cell) show several disadvantages which interfere with the precision of a dosing process. These disadvantages are the significant pressure drop, the time gap between occurrence and detection of flow variations and the size and weight of those measurement cells. This paper presents the development of a measuring cell which makes use of the thermal convectionbased anemometry. This technique is widely used for the flow measurement of gas flow rates. The authors present a design with a digital PID controller which has been developed to convert a sensor for low viscous fluids to measure the flow rate of highly viscous adhesives. The experiments were carried out with a 1-component epoxy adhesive for structural bonding in automotive industries. This concept was verified with a semi-structural adhesive based on polyurethane.

High-speed Mass Flow Measurement in Highly ViscousAdhesives by Constant Temperature Anemometry