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8712 Mass Flow Controller
Brand: Burkert Fluid Control Systems
Type 8712 controls the mass flow of gases that is relevant for most applications 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.
Due to the fact that the sensor is directly placed in the bypass channel a very short settling time of the MFC is reached. In this way, the mass flow can be maintained at a fixed value or a predefined profile can be followed, regardless of pressure variations or other changes in the system. Type 8712 can optionally be calibrated for two different gases, the user is able to switch between these two gases.
As the control element, a proportional valve working at low friction guarantees a high sensitivity and a good control characteristics of the unit. The Mass Flow Communicator software can be used for parameterization and diagnosis.
Specifications
Accuracy
- ± 0.3% of Full Scale after 1 Minute Warm-Up Time
- ± 0.8% of Reading after 1 Minute Warm-Up Time
Ambient Temperature Range
- -10° to 50° C (14° to 122° F)
Applications
- Environmental Technology
- Food & Beverage
- Gas Dosing
- Gas Production Processes
- Heat Treatment
- Pharmaceutical Industry
- Process Technology
Approvals & Certifications
- CE
BSP Connection
- G 1/4" Female
Communication
- DeviceNet Bus
- Digital
- Fieldbus, CANopen
- Modbus RTU
- Profibus DP
- RS-232
- RS-422
- RS-485
- USB
Consumption
- Power Consumption: 3.5-14 W (Depending on Version)
Electrical Connectors
- DeviceNet & CANopen: D-Sub 9-Pin Connector
- D-Sub 15-Pin Connector
- PROFIBUS-DP, DeviceNet & CANopen: 5-Pin M12 Socket (for IP65)
- Socket M16, 8-Pin Round Connector
Electrical Contacts
- Normally Closed
- Normally Open
Enclosure, Body Material
- Polycarbonate
- Stainless Steel
Environmental Protection
- IP65
Flow Rate
- Control Valve: 0.00006 to 0.32 m³/hour (Kvs Value)
- Nominal Flow Range: 0.01 to 80 LPM
Function
- Close-Tight
Indication
- LED Indication for Power, Communication, Limit & Error
Input Impedance
- 20 KiloOhms (Voltage)
Input Signal
- Set Point (Signal Setting): 0-10 V
- Set Point (Signal Setting): 0-20 mA
- Set Point (Signal Setting): 0-5 V
- Set Point (Signal Setting): 4-20 mA
Media
- Air
- Neutral Gasses
Mounting Position
- Horizontal
- Vertical
NPT Connection
- 1/4" NPT Female
Operating Pressure
- Maximum
Operating Voltages
- 24 Vdc
Orifice Size
- Valve: 0.05 to 4 mm
Output
- 0-10 V
- 0-20 mA
- 0-5 V
- 4-20 mA
- Maximum
Output Load
- Maximum
Principle of Operation
- Thermal, Calorimetric
Process Temperature
- -10° to 60° C (14° to 140° F) with Oxygen
- Gas: -10° to 70° C (14° to 158° F)
Relay Output
- Two Relay Output: 1 A at 60 V, 60 VA
Repeatability
- ± 0.1% of Full Scale
Response Time
- Settling Time (t95%): < 300 milliseconds
Seat / Seal Material
- Seal: EPDM
- Seal: FKM
Sensor Circuit
- Residual Ripple: < 2%
Tolerance
- Voltage: ± 10%
Turndown
- 1:50
