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

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