Stafford, Texas

LIQUI-FLOW Series, Industrial Style Mass Flow Meters and Controllers

LIQUI-FLOW Series, Industrial Style Mass Flow Meters and Controllers

The LIQUI-FLOW Series digital liquid flow meters and 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, through-flow measuring principle and are equipped with a digital pc-board, featuring self-diagnostics, alarm and counter functions, digital communication (RS232), and a variety of Fieldbus options.

  • Lowest range 0.25 … 5 g/h
  • Highest range 0.02 … 1 kg/h for fluids with thermal properties similar to H2O


  • 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, rugged, waterproof design


LIQUI-FLOW Digital Thermal Mass Flow Meters and Controllers Model Line-Up

Liquid Flow Meters

Liquid mass flow meters of the LIQUI-FLOW Series are built around a stainless steel tube without any moving parts or obstructions. The heater/sensor assembly is arranged around the tube and, by following the anemometric principle, a constant difference in temperature (ΔT) is created and the energy required to maintain the ΔT is dependent on the mass flow rate. Due to the benefits of the unique patented sensor, the fluid will be warmed to a maximum of 5°C, thereby making the LIQUI-FLOW Series suitable for fluids with low boiling points.

Liquid Flow Controllers

The industrial style liquid flow meter can be connected to an industrial style (IP65) 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.
Full Scale capacities (based on H2O) versus Pressure Rating

PN 100 bar (Mass Flow Meter) PN 100 bar (Mass Flow Controller)
L13I  |  5 … 100 g/h L13I-C2I  |  5 … 100 g/h
L23I  |  100 … 1000 g/h L23I-C2I  |  100 … 1000 g/h