Fluidwell C401 Hydrogen Dispenser

The next level in (Ex e) flow computing: powerful, field mounted, weights and measures approved and suitable for use in extreme atmospheres.


The next level in flow computing: powerful, field mounted, weights and measures approved and suitable for use in hazardous atmospheres.

The design of the C401 is a logical next step, based on our successful product lines for harsh surroundings and explosive atmospheres. The C-series is designed with a focus on high-quality and reliability for use in metrological / custody transfer applications. The C401 is a Hydrogen dispenser in conjunction with Coriolis mass flow meters.

Ruggedness and reliability is what Fluidwell stands for and it is now available in a comprehensive well designed and purpose driven Zone 2 flow computer, approved by PTB (Germany).

  • Robust aluminum field enclosure suitable for outdoor truck mounting.
  • Straight forward operation and automated control of the Coriolis mass flow meter.
  • All info at a glance, with the large backlit graphical LCD suitable for extreme outdoor use.




By default, we offer an extensive portfolio. Products that can be easily adapted to your needs. Moreover, we like to think along and ahead to achieve the best solution for any application. We have just one goal in mind:

Your Success Count

You want to be on track continuously when it comes to quality, safety and yield. Moreover, you want to work with systems that guarantee maximum performance and uptime, even under extreme conditions. Fluidwell offers you the best, future-proof answers in the field of signal processing equipment.

Flow indicators, totalizers and computers are our core business. We have the profound knowledge and experience to develop products that perform, always. We develop beyond specs, intrinsically safe, and explosion proof… because we know what works best and what the requirements are to keep working over time.


  • Metrology approved system by PTB, according to MID MI002 / OIML R137.
  • Zone 2 ATEX certification according to: EX II 3 G Ex ec IIC T4 Gc.
  • Displays current volumetric and mass flow rate, deliverd total, time/date, status indication, engineering and time units.
  • Low flow rate and cut-off limit alarms with adjustable hysteresis. hysteresis.
  • Application driven design for truck dispense of Hydrogen (GH2+).
  • Dedicated communication port for Coriolis mass flow meter.
  • Communication port for data transfer to industrial Open Platform Communications (OPC).
  • Communication port for direct ticket printing.
  • Full integration and control of the Coriolis mass flow meter.
  • Extensive logging of process data, events and error handling.
  • Large graphical user interface with large digits.
  • Bright backlight for good readability during day and night.
  • Multiple languages supported.
  • Ambient temperature: -25°C to +55°C (-13°F to 133°F).
  • For further details or new opportunities, please contact us: +31 413 343786 or click here.

Product Specifications

Signal Inputs

Flowmeter Inputs

  • Coriolis Mass Flowmeter Input:
    RS485: Modbus ASCII / RTU

Signal Outputs

Pulse outputs

  • None

Alarm outputs

  • None

Analog outputs

  • None

Control outputs

  • None


Power Supply

  • 16 – 27V DC.

Hazardous Area

Non-Sparking, Zone 2

  • ATEX:
    Gas: II 3 G Ex ec IIC T4 Gc


  • Port 2:
    Function: All Metrologically relevant data.
    Interface: RS232 / RS485 2-wire or 4-wire.
  • Port 3:
    Function: Metrologically Print receipt.
    Interface: RS232


  • Hydrogen distribution on board of trucks or marine bunkering. For accurately register metrologically the dispensed amount of Hydrogen.
  • For loading and unloading Hydrogen trucks, trains and other carriers.
  • The (re)calibration of Hydrogen Refilling Station (HRS).