LIQUI-FLOWTM series L10 / L20 digital Liquid Mass Flow Meters / Controllers LIQUI-FLOWTM Series L10/L20 are digital Liquid Flow Meters/Controllers for low flow ranges. 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. Lowest range 0,25 ... 5 g/h. Highest range 20 ... 1000 g/h for fluids with thermal properties similar to H2O. Note: For ultra low flow ranges, Bronkhorst High-Tech offers the µ-FLOW series. Ranges: 1,5 ... 30 mg/h up to 0,1 ... 2 g/h IPA- or H2O-equivalent. Features: Fast and accurate measurement No moving parts Thru-Flow measurement Suitable for liquids with low boiling point Attitude insensitive Very small internal volume In combination with a control valve: continuous and stable control Analog or digital: RS232, Profibus-DP®, DeviceNetTM or Modbus Applications: Semiconductor industry Pharmaceutical industry Food industry (flavors, additives) Biotechnical industry Analytical laboratories HPLC-applications Features: Flow control is achieved by integrating a control valve onto the body of the Liquid Flow Meter. This control valve has a purge connection to eliminate air or gas during start-up. The electronic control function forms part of the normal circuitry in the meter. Alternatively the liquid flow can be controlled using a close-coupled pump.