Replace your discontinued Grundfos VFS flow sensor. Keep your controls.

SIKA VVX vortex sensors match the VFS signal, scaled to your exact flow range.

  • 5 V DC supply, same as VFS
  • 0.5-3.5 V flow output, temperature also available
  • Exact flow scaling to your VFS range. No controller or software changes
  • Plastic or stainless steel bodies
  • Industry-standard M12 connector
Grundfos to VVX comparison

Same signal. Same flow scaling.

Everything your controller sees stays the same. Here's the side-by-side.

Grundfos to VVX side by side

Plastic or Stainless.

Vortex flow sensor VVX15 NPT

Plastic (PPS GF40): Lightweight and cost-optimized for high-volume heat pump builds. Glass-fiber reinforced PPS body, EPDM seals. Threaded or QuickFasten connections.

Vortex flow sensor VVX15 stainless steel

Stainless steel: For higher pressure or harsher media. Robust stainless housing, threaded connections. Same 5 V / 0.5-3.5 V electrical interface.

FAQ

Can I move to a digital or industrial output instead?

Yes. Besides the 0.5-3.5 V version, VVX sensors are available with IO-Link, 4-20 mA, 0-10 V and frequency outputs if you want a more standard industrial protocol.

Is it really a drop-in replacement?

Same 5 V supply and 0.5-3.5 V flow signal, scaled exactly to your VFS flow range. Same M12 connector too. The only change is body length, so check the dimension drawing for your size.

Do I need to change my controller or software?

No. The output CAN BE scaled to match your existing VFS range.

Do I need new cables?

No. SIKA uses the same M12 connector as the VFS, so it plugs into your existing harness.

What's the lead time and minimum order?

Lead times vary depending on the configuration. There is no minimum order. Contact us for for lead times.

Can I get samples?

Yes. Contact us for to find your match and order samples.

Disclaimer

Grundfos and Grundfos Direct Sensors are trademarks of Grundfos Holding A/S. SIKA is not affiliated with or endorsed by Grundfos. Model references are for cross-reference purposes only. Specifications subject to change; see datasheets.