Push-in flow sensor Type VTH25


Product description

Possible areas of application Push-in turbine flow sensor Type VTH 25

Push-in flow sensors of the type VTH20 were specially developed for the installation in fittings and feature an easy and space-saving system integration. Typical applications for these flow sensors are:

  • Tap water detection
  • Water treatment
  • Leak detection



Measuring principle
The liquid flowing into the turbine flow sensor is split into individual jets by the guiding blade. These jets hit the rotor evenly from different directions, setting the rotor in motion. The rotation speed of the rotor is then converted to an electrical pulse signal (frequency): The rotor is fitted with magnets and a Hall effect sensor detects the rotation of the rotor.
A flow-proportional frequency signal (square-wave signal) is made available.
The construction of the guiding blade and rotor enables to realize the very low start-up flow values.

In general, push-in flow sensors consist of three components: push-in turbine, Hall effect-sensor and adapter sleeve for Hall effect sensor. This three-part construction is the key for the space-saving installation in e.g. filter heads and allows the separate installation of hydraulic and electrical components. A high quality sapphire bearing guarantees a long durability of the measuring system and allows the measurement of low flow rates from one litre per minute  due to low start-up velocities.

  • Low deviation in mass production, fixed pulse rate
  • Low start-up
  • High measuring accuracy
  • Compact dimensions
  • Proven in numerous mass production applications


Technical features

Technical features

 Push-in turbine
Flow range 4...160 l/min with continous operation max. 80 l/m
Accuracy ±5 % of range (up to 5 l/min ±7 % of reading)
Repeatability ±0.5 %
Signal output From < 1 l/min
Medium temperature Max. 85 °C
Nominal diameter DN 25
Hall effect sensor
Nominal pulse rate
Frequency output
65 pulses/l
NPN open collector
Power supply 10...30 VDC (optional 4.5...26.5 VDC)
Electrical connection 2 m PVC cable, shielded (Tmax = 75 °C)
Adapter sleeve for Hall effect sensor
Pressure rating PN 10
Process connection G⅜ A

 Further details and accessories can be found in the datasheet.



Data sheet


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