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

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