Fluidwell F124 Ratio Controller

This product has "Limited Availability", please consult your local supplier for prices and lead times. The F124 ratio controller has been designed to ensure that two flows are kept at the same ratio even if flows are changing. The Fluidwell ratio controller will show a strong influence of maintaining a good and constant quality of products and saves money on the blending components. The F124 is a key product of the Fluidwell Process Controller family and is the alternative to replace existing pneumatic controllers in local control loops.

Fluidwell F124 Ratio Controller



  • Robust aluminum or stainless steel 316L field enclosure (IP66, IP67 / NEMA Type4X) .
    It is so rugged, a truck can even stand on it!
  • Intrinsically Safe available - ATEX and IECEx approval for gas and dust applications.
  • Familiar easy operation with the Fluidwell "Know one, know them all" configuration structure, saving time, cost and aggravation.
  • Very diverse mounting possibilities: walls, pipes, panels or directly onto outdoor sensors.


  • Controls the desired ratio between main and additive flow.
  • Displays flow rate A and B, alarms, setpoint and actual ratio %.
  • Safety mode input to enable a safe predefined position.
  • Two alarm values can be entered in %: low and ratio alarm.
  • Easy operation mode switching : Hand / Local / Ratio.
  • Ability to process all types of signals: Sine wave (coil), NAMUR, NPN/PNP pulse, Reed-switch and Active pulse signals.
  • Remote control: Safety mode input.
  • Analog control output eg. to control a valve.
  • Two alarm outputs for low and high ratio alarm.
  • Full Modbus communication RS232/485/TTL.
  • Power requirements: Loop or battery powered, 8 - 30V DC,8 - 24V AC/DC or 115 - 230V AC.
  • Sensor supply: 3 / 8.2 / 12 / 24V DC.
  • Auto backup of settings and running totals.


  • Applications where a constant ratio between a main flow and an addititve flow is desired (e.g. applications like glueing, blending or mixing) without the need to manually control the additive flow.
  • The F-Series is your first and best choice for field mount indicators in safe and hazardous area applications. Especially in harsh weather conditions like rain, snow, sandy deserts, salty atmospheres and temperatures between -40°C up to +80°C (-40°F up to 176°F).

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Product specifications

  • Signal Inputs
    • Flowmeter Inputs
      Pulse type inputs:
      Reed-switch, NAMUR, NPN/PNP pulse, Sine wave (coil), active pulse signal.
      Different pulse signal types are allowed for input A and B.
    • Status Inputs
      Remote control: Safety mode which stops the control process and places the valve in a safe position.
  • Signal Outputs
    • Pulse outputs
      • None
    • Alarm outputs
      • Function: Two alarm outputs for low and high flow rate alarm (not available with analog input).
      • Type: Two passive NPN transistors, active PNP transistors or isolated electro-mechanical relays.
    • Analog outputs
      • Function: Control output to position the valve of the flow.
      • Type: One passive isolated, floating or loop powered 4 – 20mA output or one active (0)4 – 20mA or 0 – 10V DC output.
  • Supply
    • Power Supply
      • Long-life Lithium battery.
      • 4 – 20mA Output loop-powered.
      • 8 – 24V AC/DC.
      • 115 – 230V AC.
      • Basic: 8 - 30V DC.
    • Sensor Supply
      • 3.2, 8.2, 12, 24V DC.
  • Hazardous Area
    • Intrinsically Safe
      • ATEX:
        Gas: II 1 G Ex ia IIB/IIC T4 Ga
        Dust: II 1 D Ex ia IIIC T100 °C Da
      • IECEx:
        Gas: Ex ia IIC/IIB T4 Ga
        Dust: Ex ia IIIC T100 °C Da
    • Explosion Proof
      • ATEX:
        Gas: II 2 G / Ex d IIB T5 Gb
        Dust: II 2 D / Ex t IIIB T100°C Db
  • Communication
    • Function: All process data and settings can be read and modified through the communication link.
    • Protocol: Modbus RTU.
    • Interface: RS232 / RS485 2-wire or 4-wire / TTL.
    • HART communication is available with the F018 & E018 Flow rate Monitor / Totalizers.

Download Datasheet: Fluidwell F124 Ratio Controller

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