Dutch firm Bronkhorst High-Tech, specialists in low flow measurement and control, has launched a new pump that it says offers an alternative method of liquid flow control.
The Liqui-Flow Pump is designed for small flow ranges and low viscosities. Instead of using a liquid flow meter with integrated control valve, the new product utilises a Thermal or Coriolis mass flow meter in combination with a close-coupled gear pump, covering ranges from 20 mg/h up to 600 kg/h. Flow control is achieved by utilising the integrated controller function on the pc-board of the liquid flow meter.
The liquid dosing system accepts analog and RS232 setpoint as a standard and can be equipped with various fieldbus interfaces. Applying a flow meter controlled pump eliminates the need to pressurise the liquid source with inert gas blanket or similar techniques, Bronkhorst says.
The company also offers a series of pumps for applications that require higher flow rates, higher pressures, wide control ranges or aggressive fluids. All gear pumps are virtually pulsation free, thus avoiding the problem of pulsating flow patterns. Due to a combination with a mass flow meter, the dosing system is not volumetric but delivers mass flow with high accuracy.