Burkert 8719 LFC Liquid Flow Controller

The Burkert 8719 Liquid Flow Controller (LFC) is an instrument designed for precise control of liquid flow rates in process technology. It integrates a sensor for flow measurement with a digital control system and a proportional control valve to maintain a set flow rate, even in the presence of system disturbances. The device is suitable for liquid dosing applications and offers high dynamic control due to its fast flow measurement capabilities. It features a compact design with no moving parts in contact with the medium and a high degree of protection (IP65).

### Technical Specifications

* **Flow Control Range:** 0.9 to 36 l/h (15 to 600 ml/min) for water
* **Measurement Principle:** Differential pressure measurement. An orifice in the main channel creates a pressure loss that is measured by a differential pressure sensor. The electronics then calculate the corresponding flow rate.
* **Control Algorithm:** PI-control algorithm is used to adjust the output to the proportional valve.
* **Dynamic Control:** High dynamic control through fast flow measurement.
* **Settling/Response Time:** Less than 500ms. For the 8719, settling time (t95%) is also mentioned.
* **Accuracy:** ±1.5% of reading ±0.5% of full scale.
* **Repeatability:** High repeatability is noted.
* **Turn-down Ratio:** 1:10.
* **Operating Medium:** Clean and low-viscosity liquids. Viscosity range is 0.4 to 4 cSt.
* **Media in Contact with Material:** Stainless steel. Sealing materials include FKM, EPDM, FFKM.
* **Maximum Operating Pressure (at inlet):** Up to 10 barg; typically max. 2 barg for measurement range.
* **Calibration Medium:** Water, with conversion to operating medium using a correcting function.
* **Medium Temperature:** 10 to +40 °C.
* **Ambient Temperature:** 0 °C to 55 °C.

### Electrical

* **Analogue Interfaces:** 4-20 mA, 0-20 mA, 0-10 V, or 0-5 V.
* **Input Impedance:** > 20 kΩ (Voltage) or < 300 Ω (Current). * **Maximum Load:** 10 mA (Voltage output); 600 Ω (Current output). * **Output Signal (Actual Value):** Available via analogue signal or field bus. * **Input Signal (Setpoint):** Standard signal or field bus. * **Residual Ripple:** < 2%. * **Fieldbus:** Optional, with M12 socket (B-coded for PROFIBUS DP, DPV1 max. 12 MBaud). Communication via fieldbus connector eliminates the need for a power supply connection on the M16 plug. * **RS232/Setpoint and Flow Value Signal Cable Length:** Limited to 30 meters.### Physical* **Degree of Protection:** IP65. * **Housing Material:** Stainless steel body. * **Mounting Position:** Horizontal or vertical. * **Control Valve:** Low-friction proportional valve. The valve is a plunger type controlled by a Pulse Width Modulated (PWM) signal. * **Filter:** Integrated pre-filter, replaceable. An upstream filter is recommended to prevent blockage of the aperture by contaminated mediums. * **Electrical Connection:** Round socket, 8-pin (for non-fieldbus versions). For fieldbus versions, an M12 socket is used. * **Dimensions:** Not explicitly detailed in the provided snippets, but noted as compact. * **Weight:** Not explicitly detailed in the provided snippets.### Compatibility* **Can be Combined With:** * Type 8611 eCONTROL – Universal controller * Type 6011 Plunger valve 2/2 way direct-acting * Type 6606 2/2 or 3/2 way Rocker-Solenoid Valve with separating diaphragm * Type 8619 multiCELL – multi-channel and multi-function transmitter/controller * **Software:** MassFlowCommunicator software for parameterization and diagnosis.### Application Areas* Liquid dosing in heat treatment, machine tools, fuel cell technology, packaging technology, material coating, and bio-reactors. * Ideal for applications requiring precise liquid handling, automated metering of small liquid amounts, and where simple installation and use are important. * Testing facilities for quality management.### Important Considerations* The Burkert 8719 LFC has been listed as not available starting January 1, 2026, and users are advised to contact Burkert for suitable successor articles. * For optimal selection, pressure values before and after the LFC at the maximum flow rate (Qnom) are required, in addition to the maximum inlet pressure (p1max). * The device is designed for clean and low-viscosity liquids and must not be used for fluids containing particles larger than 20 µm. * Observe material compatibility for specific media using Bürkert's resistApp or by contacting them directly. * Care must be taken with electrostatic discharge (ESD) sensitive components during handling and installation.Why Choose Aumictech for Burkert 8719 LFC Liquid Flow Controller? At Aumictech, we specialize in supplying high-end fluid control equipment. Whether you need precise liquid flow regulation, robust process integration, or reliable performance in demanding environments, our team ensures the Burkert 8719 LFC Liquid Flow Controller delivers maximum performance for your application.