8701 Mass Flow Meter

Brand: Burkert Fluid Control Systems

Mass flow meters are used in process technology for the direct measurement of the mass flow of gases. In case of volumetric flow meters, it is necessary to measure the temperature and the pressure either the density, because gases change their density or rather their volume depending on the pressure. The measurement of the mass flow, on the other hand, is independent on pressure and the temperature. 

The digital mass flow meter Type 8701 uses a sensor on silicon chip basis located directly in the bypass channel. Due to the fact that the sensor is directly in the bypass channel a very short response time of the MFM is reached. The actual fow is given as an Analog output signal or could be read out over RS communication. 

Type 8701 can optionally be calibrated for two different gases, the user is able to switch between these two gases. 

The materials of the parts that come into contact with the medium are selected according to customer specifi cation so that the unit can be operated with the complete range of standard process gases. The MassFlowCommunicator software can be used for parameterisation and diagnosis.

Specifications

Accuracy

  • After 1 Minute Warm-Up Time: ± 0.3 % of Full Scale
  • After 1 Minute Warm-Up Time: ± 0.8 % of Reading

Ambient Temperature Range

  • -10° to 50° C (14° to 122° F)

Applications

  • Analytical Instruments
  • Environmental Technology
  • Gas Flow Measurement
  • Medical Technology
  • Test Bench Equipment

Approvals & Certifications

  • CE

BSP Connection

  • G 1/4” Female

Communication

  • DeviceNet Bus
  • Digital
  • FOUNDATION Fieldbus, CANopen
  • Modbus RTU
  • PROFIBUS DP
  • RS-232
  • RS-422
  • RS-485
  • USB

Consumption

  • Power Consumption: 2.5 W
  • Power Consumption: 5 W (with Fieldbus)

Electrical Connectors

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

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

Indication

  • LED Indication for Limit (with Analog Signals), Communication (with Fieldbus) & Error

Media

  • Air
  • Neutral Gasses

Mounting Position

  • Horizontal
  • Vertical

NPT Connection

  • 1/4” NPT Female

Operating Pressure

  • Maximum

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)

Ratio

  • Span 1:50 (2-100 %)

Relay Output

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

Repeatability

  • ± 0.1 % of Full Scale

Response Time

  • < 300 milliseconds

Seat / Seal Material

  • Seal: EPDM
  • Seal: FKM

Sensor Circuit

  • Residual Ripple: < 2 %

Tolerance

  • Voltage: ± 10 %

  • Test benches
  • Environmental technology
  • Medical technology and
  • Analytical instruments

Documentation

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