8718 Liquid Flow Controller

Brand: Burkert Fluid Control Systems

Type 8718 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 variations or other changes in the system. As a control element, a proportional valve working at low friction guarantees a high sensitivity and the good control characteristics of the unit. Mass Flow Communicator software can be used for parameterisation and diagnosis.

Specifications

Accuracy

  • ± 0.5% of Full Scale
  • ± 1.5% of Reading

Ambient Temperature Range

  • 0° to 55° C (32° to 131° F)

Applications

  • Bio Reactors
  • Fuel Cell Technology
  • Heat Treatment
  • Machine Tools
  • Material Coatings
  • Packaging Technology

BSP Connection

  • G 1/4" Female
  • G 1/8" Female

Communication

  • DeviceNet Bus
  • Digital
  • Fieldbus, CAN Open
  • Profibus DP V1

Consumption

  • Power Consumption: 10 W with Fieldbus Version
  • Power Consumption: 7.5 W

Electrical Connectors

  • DeviceNet & CANopen: M12 Plug, 5-Pin
  • D-Sub 15-Pin Connector
  • PROFIBUS: 5-Pin M12, Socket

Electrical Contacts

  • Normally Closed
  • Normally Open

Enclosure, Body Material

  • Polycarbonate
  • Stainless Steel

Environmental Protection

  • Typical of Protection: IP40

Flow Rate

  • Full Scale Range: 0.015 to 0.6 LPM Water
  • Full Scale Range: 0.9 to 36 L/hour

Indication

  • LED Indication for Power, Communication (Only in Fieldbus Version), Limit (Only in Analog Version) & Error

Input Impedance

  • 20 KiloOhms (Voltage)

Input Signal

  • 0-10 V
  • 0-20 mA
  • 0-5 V
  • 4-20 mA

Media

  • Clean & Low Viscous Liquids
  • Water

Mounting Position

  • Horizontal
  • Vertical

NPT Connection

  • 1/4" NPT Female
  • 1/8" NPT Female

Operating Pressure

  • Maximum
  • Typical, Maximum

Operating Voltages

  • 24 Vdc ± 10%

Output

  • 0-10 V, Actual Value
  • 0-20 mA (Actual Value)
  • 0-5 V, Actual Value
  • 4-20 mA (Actual Value)
  • Burden Current Output: 600 ohms, Maximum
  • Maximum

Process Temperature

  • 10° to 40° C (50° to 104° F)

Relay Output

  • One Relay Output: 1 A at 25 V, 25 VA

Repeatability

  • ± 0.5% of Full Scale

Response Time

  • Settling Time (t95%): < 500 milliseconds

Seat / Seal Material

  • Seal: EPDM
  • Seal: FFKM
  • Seal: FKM

Sensor Circuit

  • Residual Ripple: < 2%

Sensor, Probe Type

  • Differential Pressure

Turndown

  • 1:10

Viscosity

  • 0.4 to 4 cSt

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