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8711 Mass Flow Controller
Brand: Burkert Fluid Control Systems
Type 8711 controls the mass flow of gases that is relevant for most appli cations in process technologies. The measured value provided by the chip sensor (see the description on page 2) will be compared in the digital control electronics with the predefi ned 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 in contact with the gas a very fast response time of the MFC is reached. In this way, the mass flow can be maintained at a fi xed value or a predefi ned profi le can be followed, regardless of pressure variations or other changes in the system. Type 8711 can optionally be calibrated for two different gases, the user is able to switch between these two gases.
As control element a direct-acting proportional valve guarantees a high sensitivity and a good control characteristics of the MFC. The MassFlowCommunicator software can be used for parameterisation 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
- Bio Reactors
- Burner Control
- Fuel Cell Technology
- Gas Dosing
- Gas Production Processes
- Heat Treatment
- Material Coatings
- Test Bench Equipment
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: Maximum
Electrical Connectors
- D-Sub 15-Pin Plug Connector
- PROFIBUS-DP & DeviceNet, CANopen: Socket 5-Pin M12
Electrical Contacts
- Normally Closed
- Normally Open
Enclosure, Body Material
- Aluminum
- Metal
- Plastic
- Polycarbonate
- Stainless Steel
Environmental Protection
- Protection Class: IP40
Flow Rate
- Nominal Flow Range: 0.01 to 80 LPM
- Regulating Unit: 0.00006 to 0.32 m³/hour (Kvs Value)
Function
- Close-Tight
Indication
- LED Indication for Power, Limit (with Analog Signals), Communication (with Fieldbus) & Error
Input Impedance
- 20 KiloOhms (Voltage)
Input Signal
- 0-10 V
- 0-20 mA
- 0-5 V
- 4-20 mA
Media
- Air
- Neutral Gasses
Mounting Position
- Horizontal
- Vertical
NPT Connection
- 1/4" NPT Female
Operating Pressure
- Maximum
Orifice Size
- Regulating Unit Valve: 0.05 to 4 mm
Output
- 0-10 V
- 0-20 mA
- 0-5 V
- 4-20 mA
- Maximum
Output Load
- Maximum
Power Supply
- 24 Vdc
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
- One Relay Output: 1 A at 25 V, 25 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
