Resonant sensors are vibrating structures whose resonance behavior is changed by external influences. By analyzing the sensor response, these external influences can be quantified and thus measured, when the overall sensor system is well designed. Resonant sensors for viscosity and density measure the action of local fluid forces (mass inertia and viscous damping) on the sensor element.  The demands on the element are very demanding and require little aging, insensitivity to mounting conditions, solvent resistance and robustness against contamination.


With the dyn.ex operating mode for resonant sensors we set new standards in measurement accuracy and speed. Specialized signal processing methods allow the optimal adaption of the signal evaluation to the respective measuring task and the respective resonator. This guarantees reliable accuracy, high measuring speed and outstanding robustness of the sensor systems.

One of the key innovations of this mode is to sample the frequency spectrum only at a sufficient number of frequency points required to achieve the target accuracy and to eliminate the need for sensor settling for each frequency point through signal processing. In addition, the resonance estimation algorithms eliminate spurious interference signals such as those caused by electrical crosstalk, cable delay, parasitic elements and drifts.