IR flow regulator / for high-viscosity liquids / for chemicals / digital
PSF21x series Comeco Control & Measurement



  • Technology:


  • Fluid:

    for high-viscosity liquids, for chemicals

  • Other characteristics:

    digital, for water treatment

  • Flow rate:

    Max.: 1,200 l/h (5 us gal/h)

    Min.: 30 l/h (8 us gal/h)

  • Pressure:

    12 bar (174 psi)

  • Nominal diameter:

    1 in


PSF21x is a programmable flow controller designed for use with low-viscose clear or translucent liquids, transmitting IR light. The operating principle is based on the liquid volume measurement through light-weight rotor, IR sensor, and sophisticated electronics for measurement and control. The material types used (PVDF, Vectra®, Viton®, EPDM, etc.) have a good thermal (up to 90 °C) resistance. A special variant with increased chemical resistance also extends the controller application. Other ranges except the standard 0.520 l/min are available on request. PSF21x is equipped with a local 3-digit LED display and a hidden key for easy programming and flow monitoring. Output capabilities include TTL pulse output as well as PNP or NPN alarm output that activates when either of the programmable alarm limits is reached. PSF21x can be used as a flow meter, flow transmitter with pulse output, ON/OFF flow controller, or alarm unit suitable for water treatment and other applications.