Model 622

SKU: 622

Flow Switch, Directly Inserted

The Delta Controls Model 622 Flow Switch produces on/off switching action in response to liquid or gas flow through horizontal or vertical pipelines and ducts. The general purpose is to detect loss of adequate flow or to alarm of excessive flow thus protecting pumps, blowers, heat exchangers, etc. The paddle extends into the flowing stream and operates an output switch at the setpoint flow rate.

The 622 can be inserted into 1.5 through 60 inch (38 mm to 1524 mm) pipelines and ducts through a welded branch fitting pipeline tee or flange. The paddle magnetically connects to the output switch. A heavy-duty solid sealing tube separates the process fluid from the switch mechanism. Leaks and seal failures are eliminated because o-rings, diaphragms, etc, are not used.

They are factory calibrated to switch at the specified flow rate. An internal adjustment allows small switchpoint changes in the field. Large changes require changing the paddle size.

A pivoted paddle extends into the fluid stream creating force as it strikes the paddle. At a predetermined velocity, the force causes the paddle and attractor to rotate about the pivot point. The magnet reacts to the new attractor position and the output switch operates. As the flow decreases, the paddle and output switch return to the original states.


  • Electrical contacts can be replaced while in service
  • Notifies user of flow or lack of flow
  • Highly reliable magnetic design
  • Inserts directly into 1.5 in to 60 in (38 mm to 1524 mm) pipelines and ducts
  • Inserts through welded branch fitting pipeline tee or flange
  • Multiple paddle sizes available for wide-ranging applications


  • Style: Direct Insert
  • Type: Paddle
  • Temperature: -4 °F to +400 °F (-20 °C to +204 °C)
  • Standard Pressure: ≤ +2000 psi (+137.9 bar)
  • Optional Pressure: +5000 psi (+344.7 bar)
  • Actuation: ≥ 7.0 gpm (26.7 L/min) (water)
  • De-actuation: ≥ 3.0 gpm (11.7 L/min) (water)
  • Accuracy: ≤ 10%
  • Output: SPDT or DPDT, 5 A
  • Wetted Materials: 316 Stainless Steel, 400 Stainless Steel, Monel, Hastelloy C-276, PVC (other materials available)
  • Housing Material: Stainless Steel, aluminum
  • Threaded Process Connection: 1.5 in to 2.5 in MPT
  • Flanged Process Connection: 2 in to 3 in
  • Flange Rating: ≤ 600 lb

Certifications & Approvals

  • Stainless Steel Housing Options Only: Third Party Listed by CSA NRTL/C (USA and Canada)

Required Ordering Information

  • Detailed model number
  • Complete application number
  • Tag or nameplate detail (if required)
  • Documentation/testing tiers (if required, refer to Additional Resources in the product catalog)

Additional Information


Flow Switch, Directly Inserted

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