Series-GFC

Supported Applications

The Dwyer Series GFC Gas Mass Flow Controllers combine a straight tube sensor with a restrictor flow element to measure and control gas mass flow. The series is designed for clean gases compatible with the specified wetted parts.

• Gases requiring measurement ranges from 0 to 10 mL/m up to 0 to 1000 L/min

Operating Conditions & Performance

The Series GFC operates within a process temperature range of 32 to 122°F (0 to 50°C). Accuracy is specified as ±1% FS including linearity over 59 to 77°F (5 to 25°C) and 5 to 60 psia (0.34 to 4 bar); for Series GFC X143, X144, and X145 models, accuracy is ±1.5% FS.

• Repeatability: ±0.25% FS
• Response time: 2 s to within ±2% of actual flow

The standard pressure rating is 1000 psig (68.9 bar). For Series GFC-X143, X144, and X145 models, the pressure rating is 500 psig (34.5 bar).

Configuration Options

The series offers a broad selection of flow ranges paired with specific process connection sizes to match system requirements.

• Flow Ranges: Available from 0 to 10 mL/m through 0 to 1000 L/min, including intermediate steps such as 2 L/min, 5 L/min, 15 L/min, 30 L/min, 50 L/min, 100 L/min, and 200 L/min.
• Process Connections:
  • 1/4" compression fitting for flow rates ≤50 L/m
  • 3/8" for 100 and 200 L/m ranges
  • 1/2" for the 500 L/min range
  • 3/4" for the 1000 L/min range
• Housing Materials: Aluminum or 316 SS construction.
• Wetted Materials:
  • GFC-1XXX models: Anodized aluminum, brass, 316 SS and fluoroelastomer O-rings
  • GFC-2XXX models: 316 SS and fluoroelastomer O-rings
• Output Signals: Linear 0-5 VDC or Linear 4-20 mA.
• Power Supply: ±12 VDC standard; optional GFC-110P (110 V power supply) and GFC-220PE (220 V power supply).

Accessories

• GFC-CBL1: 8' cable with 15-pin connector
• GFC-CBL3: 3' extension cable for LCD readout

Note: Specified flow ranges are for an equivalent flow of nitrogen at 70°F (21°C) @ 760 mm Hg.

Key Product Differences

The Series GFC is distinguished by two primary material families and specific model numbering conventions:

• GFC-1XXX Models: Feature anodized aluminum housings with wetted parts including brass, 316 SS, and fluoroelastomer O-rings.
• GFC-2XXX Models: Constructed entirely of 316 SS for the housing and wetted path (excluding fluoroelastomer O-rings).

The series includes specific model families designated as X143, X144, and X145. These models differ from standard configurations by having a pressure rating of 500 psig (34.5 bar) instead of the standard 1000 psig (68.9 bar), and an accuracy specification of ±1.5% FS.

Model numbers follow the format GFC-, such as GFC-1101, GFC-2101, GFC-1143, or GFC-2143.