The flow velocity of gases is, for example, in the domain of power stations, a measurable variable which serves as safety monitoring.

Höntzsch vortex flow sensors are used for this reason in a dust separator in a coal pulverizing mill in a power station. The stream of pulverized coal dust has a maximum flow velocity of 35 m/s at a gas temperature of 160° C ... 185 °C. The stream of coal has a grain size fraction of 1 mm = 3%, 500 µm = 8.4%, 90 µm = 55.%. The dust content is approx. 1.2 kg coal7kg gas.

The Höntzsch vortex flow sensors are used for recording the flow velocity of the volume flow of air, gas mixtures, torch gas etc. Conventionally they can be used in the ranges from 0.5 m/s to 40 m/s and are designed for working temperatures from -25 °C to 180° C. The vortices are ultrasonically sensed. In this way, compared to other sensing methods, lower flow velocities can be measured and greater turndown ratios can be achieved.

A special advantage: Contamination of the gases by solids is of no impairment to the measurement. The vortex shedding has a self-cleaning effect on the strut.

Vortex measuring probes have no moving parts. Their reliability and corrosion resistance are well worth mentioning. They prove to be extremely stable even in rough conditions. Even moisture in gases is of no disadvantage when preventing condensation! Making use of the Höntzsch vortex principle of measurement guarantees an excellent repeatability, practically inertia-free measuring as well as low smallest measurable values.

Installation of vortex flow sensors takes place by probe guide pieces made of PVDF, PP or stainless steel with pipe sleeve connection or globe cock or alternatively DIN or ISO flanges respectively, for working temperatures from -25 °C to +200 °C.