The HFC-D-308A and HFC-D-308B are high flow digital mass flow controllers using linearized flow response technology. The digital capability enables the unit to provide fast valve response and flow control which can be optimized for applications up to 10,000 SLM of air flow.

• 300 Series patented thermal-based flow sensor with linearizing laminar flow element for superior linearity
• Microprocessor-based digital electronics for enhanced accuracy and fast valve/flow response
• Full scale flow ranges from 2,500 to 10,000 SLM (N₂)
• Accuracy of ±(0.5% Rdg + 0.2% FS) with operating pressure to 300 psig
• RS232/RS485 digital communications via dual RJ connectors plus 15-pin analog I/O and status/flow LEDs
• IP-67 rated version available; NIST Traceable Calibration and data logging software compatibility

Performance

Parameter	Specification
Full Scale Flow Ranges (N2)	2,500 to 10,000 SLM
Microprocessor-based Enhanced Accuracy and Digital Features	YES
Accuracy	±(0.5% Rdg + 0.2% FS)
Repeatability	±0.15% of FS
Operating Temperature	-20° - 70°C
Warm up time	30 min optimum accuracy 2 min for ±5% of full scale
Temperature Coefficient of Zero	Auto-zero when Valve is Closed
Temperature Coefficient of Span	Maximum ±0.1%(Rdg)/°C (-20—70°C)
Operating Pressure - Maximum	300 psig

Electrical

Parameter	Specification
Voltage	11-36 VDC (±12, ±15 acceptable) 15 VDC min. for 0-20 & 4-20 mA
Power "A" Series	6.7 W

Physical

Parameter	Specification
Weight (approx.)	37 lb (16.8 kg)
Wetted Materials	316 SS, 302 SS, Ni 200, Viton® (Optional Buna-N®), Kalrez, PTFE

Standards

Parameter	Specification
European Pressure Equipment Directive (PED)	97/23/EC
EN61010-1	Safety of Electrical Equipment for Measurement, Control and Laboratory Use
EN 61326:1997/A2:2000	Radiated Emissions (Note: for Mounted Electronics ONLY)
EN 61326:1997/A2:2000	Conducted Emissions
EN 61000-4-2:1995/A2:2000	Electrostatic Discharge
EN 61000-4-3:1995/A2:2000	Radiated RF Immunity
EN 61000-4-4:1995/A2:2000	Electrical Fast Transient/Burst
EN 61000-4-6:1996/A2:2000	Conducted RF
EN 61000-4-8:1993/A2:2000	Magnetic Field

HFC-D-308A Specifications  Download