Turbine flow sensor Type VTL20


Product description

Possible areas of application Turbine flow sensor Type VTL20

SIKA VTL20 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

Turbine flow sensor OEM version
Material pipe section Brass
Measurement range 1...42 l/min - with continuous operation max. 25 l/min

±1 % of range
±3 % of reading (from 15 l/min)
Repeatability ±0.2 l/min
Signal output

From 0.25 l/min

Medium temperature

0...85 °C

Pressure rating PN 16
Nominal diameter DN 20
Process connection G 1 male thread
Sensor Hall effect sensor

Output signal

Pulse rate / K-factor
Signal shape
Signal current


116 pulses/l
8.6 ml/pulse
Square wave signal NPN open collector, pulse duty ratio 50:50
Max. 10 mA

Electrical connection 2 m PVC cable, shielded (Tmax = 75 °C)

Power supply

4.5...24 VDC
Degree of protection EN 60529 IP54
Max. particle size in the medium < 0.63 mm


  • Screen filter in the inlet:
    Mesh size 0.4 mm


Further details and accessories can be found in the data sheet.


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