Precise measurement and control of the smallest quantities of liquid

The new highly resistant mass flow meters and controllers Type 8756 from Bürkert Fluid Control Systems are based on the Coriolis measuring principle, which determines the mass flow independent of pressure and temperature. Thanks to the extensive measuring / control range and stable zero-point, even the smallest quantities of liquid can be measured, controlled or dosed precisely with highest repeatability.

The smallest quantities of substances have to be measured and controlled reliably and precisely for applications in thin film coating technology, test benches, micro reaction technology and the food and beverage industry, for instance when dosing aromas or fragrances. The new mass flow meters and controllers (MFM and MFC Type 8756) from Bürkert Fluid Control Systems are designed for practical application: They are based on the Coriolis measuring principle, which determines the mass flow of the medium.

The measurement is completely independent of the medium and any interference, such as changes to the pressure and temperature. They are characterised by their particularly high flow measuring accuracy of ± 0.2% of the measuring range ± 0.0014 kg/h and operate with an extremely high level of repeatability, even at very low flow rates. The sensor is ideal for a flow range up to 25 kg/h for water or media with similar dynamic viscosity and offers an unsurpassed large and fully usable measuring range greater than 1:250.

All parts which come into contact with media are made of high-quality stainless steel (AISI 316L), thus ensuring a high level of chemical resistance, even for aggressive media. Calibration with the real operating media is not required, since calibration is always carried out with water. The devices can be used for any kind of liquid with dynamic viscosities between 0.3 mPa*s and 200 mPa*s, which obviously reduces the number of components and simplifies storage. Type 8756 is available as a plain mass flow meter (MFM) or mass flow controller (MFC) with proportional valve or integrated micro annular gear pump as well as with integrated batch controller. The MFC is able to readjust any deviations from the set-point value in less than one second.

Vibration-resistant and low maintenance multi-parameter measurements
In addition to the mass flow, the MFC Type 8756 also measures the temperature and density of the medium. This allows conclusions to be drawn about the actual medium. The sensor is mechanically isolated and therefore immune to possible interference, such as vibrations caused by pumps in the process environment. The design guarantees high zero-point stability of the sensor which enables error-free, stable processes and reduces maintenance requirements. Further, a Bürkert solenoid valve can be integrated into the MFM to guarantee compact batch dosing. Communication is achieved via the CANopen-based Bürkert system bus (büS). In combination with the Type ME43 gateway, all common Industrial Ethernet protocols (PROFINET, EtherNet/IP, EtherCAT, Modbus TCP) or fieldbus interfaces (PROFIBUS-DP, CC-Link) are also supported.

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