Turbine flow sensor Type VTH25


Product description

Possible areas of application Turbine flow sensor Type VTH 25

SIKA VTH25 turbine flow sensors are used for flow measurement and dosage in water and water mixtures, and are used in many applications such as:

  • Monitoring cooling circuits in machine and plant engineering
  • Water treatment
  • Cleaning processes
  • Dosing



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.

Technical features

Technical features

Economy-priced type for standard and serial applications
Material pipe section
Plastic PP
Measurement range 4...160 l/min - with continuous operation max. 80 l/min
Accuracy ±5 % of measured value (up to 5 l/min 7 % of measured value)
Reproducibility ±0.5 %
Medium temperature


Plastic PP



Max. 85 °C

Max. 80 °C / 2 bar
Max. 60 °C / 5 bar
Max. 30 °C / 10 bar

Pressure rating PN 10
Nominal diameter DN 25
Process connection G 1¼ male thread*
Sensor Hall effect sensor
Pulse output 65 pulses/litre
Electrical connection 2 m PVC cable, screened (Tmax = 75 °C)

Power supply

10...30 VDC
optional 4.5...26.5 VDC
Degree of protection IP54

* Supplementary connection adapters required



  • Screen filter: Flat filter, mesh size 0.63 mm


Further details and accessories can be found in the datasheet.


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