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Type 8713 controls the mass flow of gases that is relevant for most applications in process technologies. 

The measured value 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 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 fixed value or a predefined profile can be followed, regardless of pressure variations or other changes in the system. 

Type 8713 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. 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 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)

Approvals & Certifications

  • CE

BSP Connection

  • G 1/4” Female

Communication

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

Consumption

  • Power Consumption: 3.5-11.5 W (Depending on Control Valve Used)

Electrical Connectors

  • D-Sub 9-Pin Plug Connector

Electrical Contacts

  • Normally Closed
  • Normally Open

Enclosure, Body Material

  • Aluminum
  • Metal
  • Stainless Steel

Environmental Protection

  • Protection Class: IP40

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, 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 4 mm

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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