Vortex flow sensor Type VVX25


Product description

Possible areas of application Vortex flow sensor Type VVX 25

SIKA VVX25 flow sensors are used for measuring water flow at low and medium measurement ranges.
One such application area is heating systems.



Alternate vortices rotating in opposite directions are generated behind a bluff body immersed in a flow. The vortices detach from the edges of the bluff body and form a Kármán vortex street in the fluid stream. The distance between the single vortices is constant. The frequency of the vortices flowing past a sensor depends on the flow rate and is proportional to the flow. The sensor detects these vortices which are then converted to an electrical frequency signal.





Technical features

Technical features

Nominal diameter DN 25
Flow range 7...150 l/min
Process connection G 1¼-ISO 228 male, incl. O-rings
Accuracy ±2 % of full scale*
Pressure rating PN 10

Temperature ranges



5...90 °C -20...90 °C**
5...70 °C → Repeatability ±0,5 %, -20...5 °C → Repeatability ±1 %

Frequency output Frequency signal, square wave, pulse duty ratio 50:50, signal current max. 20 mA

Analogue output

Output signal flow

0.5...3.5 V
0...10 V or 4...20 mA

Power supply 8...30 V DC or 5 V DC (±5 %) or 12...24 VDC****
Electrical connection 5-pin plug connector M12 x 1
Degree of protection EN 60529 IP65***

* Test conditions: See data sheet
** Temperature cycle test: See data sheet
*** With attached cable socket only
**** Only available for output signal flow 4...20 mA and 0...10 V


  • Recognized component ETL according to UL & CSA standards available on request

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


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