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SWI F003 Series | Inline Flow Switch

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Sensors and Switches are mechanical-type sensing devices that do not require power to operate. Engineered based on time-proven principles such as buoyancy, conductivity, magnetic latching, capacitance and more, SWI sensors and switches are manufactured to provide reliable industrial process measurement year after year. Click on a sensing device below to learn more about our available sensors and switches product line.

SWI F003 Series | Inline Flow Switch


The F003 is a low-cost flow switch designed to monitor in-line flow rates up to 50 GPM. The compact and durable design allows for easy installation and switch maintenance with a removable bonnet assembly. The F003 is comprised of a bronze body with a Teflon® shuttle mechanism. Connection sizes are available in 3/4", 1" and 2".

Principles of Operation

A spring-loaded Teflon® shuttle is vertically displaced by liquid flowing through the valve chamber in between the inlet and outlet ports. As the shuttle moves, it actuates a hermetically-sealed reed switch element within the housing system.

SWI F003 Series


  • In-Line Mounting
  • Horizontal or Vertical Mount
  • Low Pressure Drop
  • Single Fixed Set-Point
  • Easy Access to Internal Shuttle
  • Fixed Set-Points to 50 GPM


  • Water & Wastewater
  • Beverage Flow
  • Lubricant Flow
  • Coolant Flow


  • Output: SPDT 20 VA or SPDT 100 Watt


  • Process Temperature: -40º to +300º F (-40º to +148.9º C)
  • Process Pressure: 400 PSIG (27 bar)
  • Port Size: 3/4", 1" or 2" NPT
  • Maximum Viscosity: 500 SSU
  • Available Flow Set Points: 0.5 to 50.0 GPM (Water)


F003-0501-0XXX 3/4" NPT Bronze/Teflon®  -40º to +300º F 400 PSIG SPDT 100 Watt Interchangeable NO/NC 0.5 - 6.0 GPM
F003-0601-0XXX 1" NPT Bronze/Teflon®  -40º to +300º F 400 PSIG SPDT 100 Watt Interchangeable NO/NC 0.5 - 8.0 GPM
F003-0901-XXXX 2" NPT Bronze/Teflon®  -40º to +300º F 400 PSIG SPDT 100 Watt Interchangeable NO/NC 2.0 - 50.0 GPM


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Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


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