LFC Liquid Flow Controller

Transcription

1 LFC Liquid Flow Controller Type 879 can be combined with High dynamic control through fast flow measurement Applicable for liquid dosing up to 600 ml/min (6 l/h) No moving parts in medium Fieldbus optional Type 0 Multi-channel program controller Type 6606 /-way Solenoid Valve Type 60 /-way Solenoid Valve Type 879 is an instrument for liquid flow control in process technology. The measured value provided by the sensor will be compared in the digital control electronics with the predefined set point according to the signal; if a control difference is present, the control value output to the proportional valve will be modified using a PI-control algorithm. In this way, the flow can be maintained at a fixed value or a predefined profile can be followed, regardless of pressure changes or other disturbances in the system. As a control element, a proportional valve working at low friction guarantees the high sensitivity and good control characteristics of the unit. MassFlowCommunicator software can be used for parameterisation and diagnosis. Typical application areas of liquid dosing are: Heat treatment, Packaging technology, Machine tools, Material coating, Fuel cell technology, Bio reactors. In particular, the Type 879 meets the requirement of IP6. Technical data Full scale range (Q nom ) Operating medium Viscosity Max. operating pressure (at inlet) Calibration medium 0.9 to 6 l/h ( to 600 ml/min) re. water Clean and low viscous liquids 0. to cst Measurement range: up to max. 0 barg; typical max. barg Water (conversion to operating medium with correcting function) Medium temperature 0 to + 0 C Ambient temperature 0 to + C Accuracy ±. % o.r. ±0. % F.S. Repeatability ±0. % F.S. Turn-down ratio :0 Settling time(t 9% ) < 00 ms Body material Stainless steel Housing PBT Sealing material FKM, EPDM, FFKM Port connection G /8, NPT /8, G /, NPT / Control valve Valve orifi ces Electrical Connection Proportional valve; normally closed; depending on fl ow range and pressure Round socket, 8-pin, Sub-HD socket, -pin, M plug or socket, -pin (with fi eldbus) Operating voltage V DC ± 0 % Residual ripple < % Power consumption Max. 7. W (0 W with fi eldbus version) Input signal (set point) 0- V, 0-0 V, 0-0 ma or -0 ma Input impedance Output signal (actual value) Max. voltage current output Max. burden current output Alternative Input and output signal Protection class Dimensions [mm] (without compression fi ttings) Total weight Mounting position Light emitting diodes (default functions, other functions programmable) Binary inputs (default functions, other functions programmable) Binary outputs (default functions, other functions programmable) >0 kω (voltage), <00 Ω (current) 0- V, 0-0 V, 0-0 ma or -0 ma 0 ma 600 Ω Digital with fi eldbus: PROFIBUS DP DeviceNet CANopen IP6 x 7. x 7 (WxHxD) Approx. 00 g Horizontal or vertical Indication for:. Power. Communication. Limit. Error Three:. Start Autotune. Open valve (for purging). Not assigned Two relay outputs for :. Limit (desired value can not be achieved). Error (e.g. sensor failure) Capacity: max. 60 V, A, 60 VA p. /7

2 Measurement principle The sensor measures the flow by means of differential pressure. An orifice in the main channel causes pressure loss at liquid flow which is measured by the differential pressure sensor. The sensor feedbacks a precise and temperature compensated signal from which the electronics calculate the corresponding flow. To avoid a blockage of the aperture by contaminated mediums an upstream filter is recommended. Notes regarding the selection of the unit For the proper choice of the actuator orifice and differential pressure sensor within the LFC, not only is the maximum flow rate Q nom required, but also the pressure values directly before and after the LFC (p, p ) at this flow rate Q nom should be known. In general, these pressures are not the same as the overall inlet and outlet pressures of the whole plant, because usually there are additional flow resistors (tubing, additional shut-off valves, nozzles etc.) present both before and after the controller. Please use the specification sheet (p. ) to indicate the pressures directly before and after the LFC. If these should be unknown or not accessible to a measurement, estimates are to be made by taking into account the approximate pressure drops over the flow resistors before and after the LFC, respectively, at a flow rate of Q nom. In addition, please quote the maximum inlet pressure p max to be encountered. This data is needed to make sure the actuator is able to provide a close-tight function within all the specified modes of operation. The knowledge of the maximum inlet pressure is also necessary to select an adequate differential pressure sensor The request form on page 7 contains the relevant fluid specification. Please use the experience of Bürkert engineers already in the design phase and provide us with a copy of your request containing the necessary data together with your inquiry or order. p. /7

3 Ordering chart for accessories Article Item no. Electrical. Connection Round 8-pin binder plug (solder connection) Round 8-pin plug with prefabricated m cable on one side Round 8-pin plug with prefabricated 0m cable on one side SUB-HD -pin plug with prefabricated m cable on one side SUB-HD -pin plug with prefabricated 0m cable on one side Adapters ) RS adapter for connection to a computer, connection with an extension cable (item no. 9709) 6 77 PC extension cable for RS 9-pin socket/plug m RS adapter (RS8 compatible) USB adapter USB connection cable m Adapter for manual bus adresse settings (instad of SW) 667 Communication software MassFlowCommunicator Download from Accessories for Fieldbus PROFIBUS DP (B-coded) DeviceNet/ CANopen (A-coded) Plug M ) Socket M (coupling) ) Y-junction ) T-junction 98 (on request) Shut-off resistor 90 (on request) GSD-File (PROFIBUS), EDS-File (DeviceNet, CANopen) Download from ) The adapters serve mainly for initial operation or diagnosis. Those are not obligatory for continuous operation. ) The two M connectors as listed above cannot be used together on the same side of the Y-junction. At least one of the two M connection needs to be a prefabricated cable which uses typically a thinner connector. Adapter for manual setting of a bus address 667 RS adapter 6 77 RS adapter M P-DP: DVN/CAN: 97 M P-DP: 98 7 DVN/CAN: 97 6 OR Shut-off resistor P-DP: 90 (male) DVN/CAN: on request Female M with cable Male M with cable T junction P-DP: 98 DVN/CAN: on request Y junction P-DP: DVN/CAN: M P-DP: DVN/CAN: 97 6 USB adapter p. /7

4 Pin Assignment Socket D-Sub HD Pin Assignment Analogue Control Set value input + N.C. ) Bus control Set value input GND N.C. Actual value output + N.C. Binary input V-Output (only for internal company use) 6 RS TxD (direct connection to computer) 7 Binary input 8 GND (for binary inputs) 9 only company internal use (do not connect!) 0 V-Output (only for internal company use) V-Output (only for internal company use) Binary input Actual value output GND N.C. RS RxD direct connection to computer) DGND (for RS-interface) ) N.C.: not connected (not used) Note: Optional Pin and with bus version as transmitter input possible The cable length for RS/ Setpoint and fl ow value signal is limited to 0 meters. Socket M6, round, 8-pin Pin Assignment V-Supply + 7 Relay reference contact 8 Relay reference contact 6 Relay normally closed Relay normally opened 6 V-Supply GND 7 Relay normally opened 8 Relay normally closed Socket D-Sub 9-pin (only with fieldbus version) Pin Assignment PROFIBUS DP DeviceNet/ CANopen Shield Shield N.C. CAN-L data line RxD/TxD - P (B-line) GND RTS N.C. (control signal for repeater) GND N.C. 6 VDD (only for termination N.C. resistor) 7 N.C. CAN-H data line 8 RxD/TxD - N (A-line) N.C. 9 N.C. N.C. p. /7

5 Pin Assignment (continued) PROFIBUS DP socket B-coded M (DPV max. Mbaud) Pin Assignment VDD (only for termination resistor) RxD/TxD N (A-line) DGND RxD/TxD P (B-line) N.C. DeviceNet/ CANopen Plug A-coded M Pin Assignment Shield N.C. 7) DGND CAN_H CAN_L 6) Optional confi guration with V DC possible for power supply via fi eldbus connector. With this no power supply connection on round M6 plug needed. p. /7

6 Dimensions [mm] Size A G /8 G / NPT /8 NPT / In devices without fieldbus communication there is no electrical M connector in the upper housing part p. 6/7

7 LFC/LFM applications - Request for quotation Please fill out and send to your nearest Bürkert facility with your inquiry or order Company Contact person Customer no. Street Postcode/Town Department Tel./Fax LFC applications LFM applications Quantity Required delivery date Medium data Fluids Density [kg/m ] at 0ºC at 0ºC Viscosity at ºC [cst] at ºC at 0ºC at 0ºC Medium temperature [ºC or ºF] ºC ºF Abrasive components/solid particles no yes, as follows: Fluidic data Maximum flow Q nom Minimum flow Q min Inlet pressure at Q nom p = Outlet pressure at Q nom p = Max. inlet pressure p max Pipeline (external-ø) LFC/LFM port connection Installation of LFC/LFM Ambient temperature Material data Body material Seal material l/h kg/h ml/h l/h kg/h ml/h barg barg barg mm without screw-in fitting /8 G-thread / G-thread (DIN ISO 8/) /8 NPT-thread / NPT-thread (ANSI B.) with screw-in fitting horizontal, valve upright (standard) horizontal, valve to the side vertical, flow upwards vertical, flow downwards ºC Stainless steel FKM EPDM Other: l/min kg/min ml/min l/min kg/min ml/min inch Electrical data Output/Input Signal with standard signal with fieldbus Output Input 0- V 0- V PROFIBUS-DP 0-0 V 0-0 V DeviceNet 0-0 ma 0-0 ma CANopen -0 ma -0 ma Please quote all pressure values as overpressure with respect to atmospheric pressure [barg] To find your nearest Bürkert facility, click on the orange box In case of special application conditions, please consult for advice Subject to alterations. Christian Bürkert GmbH & Co. KG 0/_EU-en_0089 p. 7/7