• High accuracy (standard 0,5% of Rd plus 0,1% of FS)
  • Rangeability in digital mode up to 187,5: 1
  • Optional Multi-Gas / Multi-Range functionality: freely programmable ranges and gas types
  • Pressure rating 64 up to 700 bar (Multi-Gas / Multi-Range functionality up to 10 bar)
  • Rugged, weatherproof housing (IP65, dust and waterproof)Option: ATEX approval for Cat. 3, Zone 2
  • Option: FM approval Class I, Div. 2 (Groups A, B, C, D; T4)
  • Option: KCs certificate (Protection Ex nA IIC T4)


Weatherproof (IP65) and Rugged Design

IN-FLOW Series Mass Flow Meters/Controllers are thermal, bypass-type, mass flow meters of modular construction with a ‘industrial style’ pc-board housing. Control valves can either be integrally or separately mounted, to measure and control gas flows.

  • Lowest range 0,014…0,7 mln/min up to
  • Highest range 8…1670 ln/min
    (See IN-FLOW ‘High-Flow’ Series for ranges up to 11.000 m3n/h)


  • Process gas measurement in the food industry, chemical and petrochemical industries, in fermentation installations and in biotechnology
  • Sample gas measurement in environmental analysis
  • Gas consumption measurement for internal accounting
  • Systems for environmental air sampling
  • Hydrogen techniques
  • Burner control

Modular design & approval for hazardous locations

The control valve design distinguishes itself from competitive designs in its truly modular construction and it can be field replaced or changed by the user without any adjustment. The standard valve is normally closed and is available up to Kv-values of 6.0. Normally opened valves can also be supplied.

For high (differential) pressure applications, patented constructions enable us to handle high flows and/or pressure rating up to 700 bar (max. differential pressure 400 bar) in the IN-FLOW program, a capability that is unique in the market place.

Digital features and Fieldbus interfaces

All models of the IN-FLOW series are equipped with a digital pc-board, featuring self-diagnostics, alarm and counter functions, digital communication and remotely adjustable control settings. These digital instruments from Bronkhorst offer great flexibility their instruments with an on-board interface with CANopen®, DeviceNet™, PROFIBUS DP, PROFINET, Modbus RTU/ASCII or FLOW-BUS protocol. More information about digital “multibus” communication.

Approvals for hazardous locations

As an option, IN-FLOW Mass Flow Meters and Controllers can be offered use in explosive environments. For the European market, all IN-FLOW instruments can be adapted for application in ATEX Category 3, Zone 2. For the North American market, IN-FLOW devices can be offered with FM Class I Division 2 approval, up to a pressure rating of 400 bar (5800 psi).