Controller Measures And Doses Small Liquid Volumes

Burkert has introduced the Liquid Flow Controller (LFC), which integrates a sensor, control electronics and proportional valves. The LFC accurately measures and doses small volumes of liquids with nominal flow rates of 10-600ml/min (0.6 to 36 litres per hour) with a 1:10 measuring span. Thanks to its fast and accurate flow-rate measurement, the LFC is suitable for the dynamic control or metering of liquids such as deionised or demineralised water, methanol or low-viscosity oils.

The LFC can, therefore, be used in a number of industrial applications, including heat treatment (by carburisation or endogas generators), testing, surface coating, cooling (machine tools), filling, packaging and, in combination with Burkert mass-flow controllers (MFCs), the simultaneous dosage of gases and liquids in atomising or sterilisation processes. According to the company, the LFC is an integrated, cost-saving solution for applications where several liquids or a liquid and a gas must be regulated simultaneously.

Previously, this type of control was comparatively complex, involving the use of individual components, which raised issues of cost and interfacing incompatibilities. However, the LFC features an integrated design that optimises the differential-pressure process for liquid flow-rate measurements to give precise, fast and repeatable measurements in a compact device. The company claims that the digital controller combines reliability and functionality with features such as flow-rate measurement inside the medium flow (without moving parts); configuration and diagnosis via a serial interface using free Burkert software; an integrated totaliser for consumption analysis; flexible interfaces (analogue/digital via fieldbus or RS232/RS485); configurable binary inputs and outputs; and the option of an IP65 version for arduous environments.

The LFC is based on the tested software, hardware and mechanics of Burkert's MFC series. The controller is said to be simple to install and can be accommodated in difficult locations, such as directly behind angled piping. The device is available as either a closed-loop controller with an integral proportional control solenoid valve (LFC) or as a flowmeter (LFM).


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