EARL flow switches type 172 | type 173


The dirt-insensitive and robust vane-operated flow switches for pipelines ≥ DN 80 are used to monitor the flow of gaseous media, even at high operating pressures.

Further product information


The incoming flow encounters the vane and deflects it in the direction of flow. The permanent magnet fastened to the base of the vane actuates the switch contact. The switch point cannot be adjusted by the customer.


  • Device insensitive to dirt thanks to its corresponding bearing design
  • Sensitive monitoring instrument for switch points as of 0.6 m/sec
  • Suitable for high pressures up to PN 160 (type 172)
  • (Ex) designs
  • With end stop for the vane at higher gas velocities or in wind tunnels
  • Special design for a media temperature of up to 250°C

Let us advise you individually!

Dosch Messapparate GmbH
Kamenz Dam 85
12249 Berlin
+49 30 7201530