LIQUI-FLOW™ series L10I / L20I industrial style
Liquid Mass Flow Meters / Controllers


The LIQUI-FLOW™ series L10I/L20I digital Liquid Flow Meters / Controllers for low flow ranges are equipped with a rugged 'industrial style' (IP65) pc-board housing for use in industrial environments. The instruments operate on a thermal, thru-flow measuring principle. The flow meter can be connected to a control valve to form a closed control loop. The standard direct acting valve (model C2I) is normally closed, has a pressure capability of 100 bar (1500 psi) and a purge connection for easy elimination of air or gas.

  • Lowest range 0,25 ... 5 g/h
  • Highest range 20 ... 1000 g/h
    for fluids with thermal properties similar to H2O

"Multibus" digital communication

Bronkhorst® developed their digital instruments according to the flexible "multibus" concept, due to which the instruments can be equipped with on-board interface board with DeviceNet™, Profibus-DP®, Modbus or FLOW-BUS protocol. 
More information about digital "multibus" communication.

  • Features
  • Applications
  • Flow capacities
  • Documentation


  • Fast and accurate measurement
  • No moving parts
  • Suitable for liquids with low boiling point
  • Attitude insensitive
  • Very small internal volume
  • In combination with a control valve: continuous and stable control
  • Classification IP65


  • (Petro-)chemical installations
  • Pharmaceutical industry
  • Food industry (flavors, additives)
  • Biotechnical industry

Flow capacities (based on H2O equivalent)

Liquid Flow Meter Ranges
Series L13I min. 0,25 ... 5 g/h
max. 5 ... 100 g/h
Series L23I min. 2 ... 100 g/h
max. 20 ... 1000 g/h
Liquid Flow Controller Ranges
Series L13I + C2I
(IP65 control valve)

min. 0,25 ... 5 g/h
max. 5 ... 100 g/h

Series L23I + C2I
(IP65 control valve)
min. 2 ... 100 g/h
max. 20 ... 1000 g/h


For more information see leaflet "LIQUI-FLOW series L10/L20"

L23I industrial style Liquid Flow MeterIndustrial style Liquid Flow Controller
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