Model 622

SKU: 622

Flow Switch, Directly Inserted

The Delta Controls Model 622 produces On/Off switching action in response to liquid or gas flow rates in horizontal or vertical pipelines and ducts. A paddle extends into the flowing stream and operates an output switch at the setpoint flow rate. These switches protect pumps, blowers, heat exchangers, etc. They are factory calibrated to switch at the specified flowrate. An internal adjustment allows small switchpoint changes to be made in the field. Large changes require changing the size of the target.

The 622 can be inserted into 1.5 to 60 inches (38 to 1524 millimeters) pipelines and ducts which inserts through a welded on branch fitting pipeline tee or flange. It’s used in general purpose service for detecting loss of adequate flow, or for alarming excessive flow. Connection of the target to the output switch is done magnetically. 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.

A pivoted target extends down into the flowing fluid stream which creates a force as it strikes the target. At a predetermined velocity, the force becomes great enough to cause the target and the attractor to rotate about the pivot point. The magnet reacts to the new attractor position and the output switch operates. The target rotates back to its original position as the flow decreases, and the output switch then returns to its original position.


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


  • Style: Direct Insert
  • Type: Paddle
  • Temperature: -4 °F to +400 °F (-20 °C to +204 °C)
  • Pressure:
  • Standard: ≤ +2000 psi (≤ +137.9 bar)
  • Optional: +5000 psi (+344.7 bar) optional
  • Actuation:≥ 7.0 gpm (26.7 L/min) (water)
  • Deactuation: ≥ 3.0 gpm (11.7 L/min) (water)
  • Accuracy: ≤ 10%
  • Output: SPDT or DPDT, 5 A
  • Optional Wetted Materials: 316 Stainless Steel, 430 Stainless Steel, Monel, Hastelloy C-276, PVC Other materials available
  • Housing: Stainless Steel, aluminum
  • Process Connection:
  • Threaded:1.5 in to 2.5 in MPT
  • Flanged: 2 in to 3 in
  • 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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