Thermal Mass Flow
FC-620Thermal Gas Mass Flow Controller
The FC-620 integrates MEMS thermal sensing, a laminar bypass and an electromagnetic proportional valve for gas flow measurement and closed-loop control. Multiple ranges support laboratory, OEM and process-gas systems.
Technical overview
Published configuration data
Values below describe catalog or typical configurations. The confirmed quotation and model code define the supplied specification.
- Flow coverage
- 0.001-300 L/min
- Turndown
- 1:100
- Accuracy
- ±1.0% S.P.
- Pressure difference
- Up to 0.6 MPa
- Output
- 4-20 mA
- Communication
- RS485 Modbus RTU
Key characteristics
Why engineers consider FC-620
- Integrated proportional valve
- Fast response
- Normally closed configuration
- Digital and analog control
Typical applications
Where it fits
- 01Gas mixing
- 02Analytical instruments
- 03Medical equipment
- 04Laboratory automation
Selection checklist
Confirm these conditions before ordering.
Sending this information helps CurioSens verify the measurement principle, materials, range and interface.
- 01Process medium and composition
- 02Minimum, normal and maximum flow
- 03Operating pressure and temperature
- 04Pipe or tube size and process connection
- 05Required accuracy and response time
- 06Output, power supply and communication interface
Engineer-reviewed FAQ
Questions about FC-620
Application answers reviewed for compatibility, selection, installation and maintenance.
How does the FC-620 gas mass flow controller differ from the FS-620 mass flow meter?+
The primary distinction lies in active flow regulation. The FS-620 acts purely as a measuring meter, outputting flow data via 4-20mA or RS485 Modbus. The FC-620 integrates a high-precision electromagnetic proportional valve and closed-loop control electronics, enabling automatic flow adjustment across a 1% to 100% FS control range with a stabilization time <= 1.5 seconds. The FC-620 operates across a maximum differential pressure of 0.6 MPa and working pressure up to 1.1 MPa. Both units feature a 1:100 turndown ratio and G1/4 thread connections. Specific valve differential pressure conditions must be confirmed for the selected configuration. Provide your gas medium, flow range, pressure, temperature, viscosity, tube size, process connection, and required output.
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