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8705 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 of the pressure and the temperature. The digital mass flow meter Type 8705 uses a classic bypass sensor. The actual flow can be read out digitally over RS-communication. Type 8705 can optionally be calibrated for two different gases, the user can switch between these two gases.
The materials of the parts that come into contact with the medium are selected according to customer specification 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 30 minutes Warm-Up Time: ± 0.3% of Full Scale
- After 30 minutes Warm-Up Time: ± 1.5% of Reading
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: Maximum
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
- Full Scale Range: 0.005 to 15 LPM
Indication
- LED Indication for Power, Limit & Error
Media
- Air
- Neutral Gasses
Mounting Position
- Horizontal
- Vertical
NPT Connection
- 1/4" NPT Female
Operating Pressure
- Maximum
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
- < 3 seconds
Seat / Seal Material
- Seal: EPDM
- Seal: FFKM
- Seal: FKM
Sensor Circuit
- Residual Ripple: < 2%
Tolerance
- Voltage: ± 10%
