PSR/PS - Paddle Flow Switch

Brand: KOBOLD Instruments, Inc

KOBOLD PSR/PS all-metal paddle flow switches for liquids are made in the USA and are the ideal choice for applications requiring simple, economical, and reliable flow monitoring.

They are used as a cost effective solution for a wide variety of applications all over the world.

The rugged build is designed for industrial use and can handle high pressures and temperatures and features an easily adjustable switchpoint.

The PSR/PS operates based on the force created as the media flow presses against the paddle placed within the path of the flow.

The paddle is fitted at one end of a balance arm, which is in direct contact with a leaf spring. At the other end of the balance arm is a permanent magnet.

This magnet actuates a reed contact located within a movable housing outside the media. The reed contact changes state depending upon the position of the permanent magnet and the switch housing.

The status of the switch may then be used to monitor the flow.

The externally-adjustable reed switch on the PSR/PS allows the contacts to be set either normally open (N/O) or normally closed (N/C) with only a small switch adjustment.
  • Adjustable Switch Point
  • Easy to Install
  • Brass or SS Construction
  • Low Cost
  • Simple, Reliable Design
  • Certifications/Approvals: cCSAus
  • Made in the USA
  • Top Seller
  • Quick Delivery


PSR Switching Ranges

  • 0.6-1.2 GPM to 12.6-17.7 GPM

PS Switching Ranges

  • 18-24 to 101-141 GPM


  • 1/4” to 1-1/2” NPT Thread

Body Material

  • Brass
  • Stainless Steel

Maximum Pressure

  • Brass: 1450 psig
  • Stainless Steel: 3600 psig

Maximum Temperature

  • 230° F

Reed Switch Contact

  • SPST Standard
  • Optional SPDT

Media Category

  • Liquid

  • Chillers
  • Cooling Circuits
  • Pump Protection
  • Water Fire Suppression
  • Eye Wash Stations


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