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8715 Mass Flow Controller
Brand: Burkert Fluid Control SystemsType 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%
