8715 Mass Flow Controller

Brand: Burkert Fluid Control Systems
Does not ship to Virginia, United States

Type 8715 controls the mass flow of gases through a sensor element which is not in direct contact with the gas itself.

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 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 8715 can optionally be calibrated for two different gases, the user can 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.

This instrument communicates digitally with master devices, no further A/D conversions needed. The Mass Flow Communicator software can be used for parameterization and diagnosis.

Specifications

Accuracy

  • ± 0.3 % of Full Scale after 30 minutes Warm-Up Time
  • ± 1.5 % of Reading after 30 minutes Warm-Up Time

Ambient Temperature Range

  • -10° to 50° C (14° to 122° F)

Approvals & Certifications

  • CE

BSP Connection

  • G 1/4” Female

Communication

  • Digital
  • RS-232
  • RS-422
  • RS-485 (Half-Duplex or Full Duplex)

Consumption

  • Power Consumption: 3.5-11.5 W (Depending on Propotional Vale)

Electrical Connectors

  • D-Sub 9-Pin Plug Connector

Electrical Contacts

  • Normally Closed
  • Normally Open

Enclosure, Body Material

  • Metal
  • Polycarbonate
  • Stainless Steel

Environmental Protection

  • Protection Class: IP40

Flow Rate

  • Control Valve: 0.00006 to 0.09 m³/hour (Kvs Value)
  • Full Scale Range: 0.005 to 15 LPM

Function

  • Close-Tight

Indication

  • LED Indication for Power, Limit & Error

Media

  • Air
  • Neutral Gasses

Mounting Position

  • Horizontal
  • Vertical

NPT Connection

  • 1/4” NPT Female

Operating Pressure

  • Maximum

Orifice Size

  • Control Valve: 0.05 to 2 mm

Power Supply

  • 24 Vdc

Principle of Operation

  • Measurement is based on the Bypass Thermal (Calorimetric) Principle

Process Temperature

  • -10° to 60° C (14° to 140° F) for Oxygen
  • -10° to 70° C (14° to 158° F)

Ratio

  • Control Range 1:50

Relay Output

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

Repeatability

  • ± 0.1 % of Full Scale

Response Time

  • Settling Time (t95 %): < 3 seconds

Seat / Seal Material

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

Sensor Circuit

  • Residual Ripple: < 2 %

Tolerance

  • Voltage: ± 10 %

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