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Series GFM2 Gas Mass Flow Meter

Brand: Dwyer Instruments, LLC
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The Series GFM2 Gas Mass Flow Meters is an ideal choice for the measurement of flow rates of a wide variety of gases.

Unit can be calibrated for a variety of gases with user selectable 0 to 5 Vdc or 4 to 20 mA and two relay outputs and programmable totalizer that indicates total gas quantity.
Features
  • Utilizes a straight tube sensor with a restrictor flow element to provide a high ±1% Full Scale accuracy and ±0.25% Full Scale repeatability
  • Gas flow can be displayed in 23 different engineering units on an optional 2x16 character LCD display with internal conversion factors for up to 32 gases
  • Digital RS-232 or RS-485 interfaces allow for easy communication and for multi-drop capability of up to 256 units (RS-485 only)
  • User-friendly interface allows for the programming of high and low gas flow alarms, along with two user-programmable electromechanical SPDT relays with latch options
  • Stores calibration information for up to 10 different gases, internal or user-specific K-factors
  • Automatic sensor zero offset adjustment (via digital interface or local push button)
  • NIST traceable certificate included
  • Self-diagnostic tests
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The Series GFM2 Gas Mass Flow Meters is an ideal choice for the measurement of flow rates of a wide variety of gases.

Unit can be calibrated for a variety of gases with user selectable 0 to 5 Vdc or 4 to 20 mA and two relay outputs and programmable totalizer that indicates total gas quantity.
Features
  • Utilizes a straight tube sensor with a restrictor flow element to provide a high ±1% Full Scale accuracy and ±0.25% Full Scale repeatability
  • Gas flow can be displayed in 23 different engineering units on an optional 2x16 character LCD display with internal conversion factors for up to 32 gases
  • Digital RS-232 or RS-485 interfaces allow for easy communication and for multi-drop capability of up to 256 units (RS-485 only)
  • User-friendly interface allows for the programming of high and low gas flow alarms, along with two user-programmable electromechanical SPDT relays with latch options
  • Stores calibration information for up to 10 different gases, internal or user-specific K-factors
  • Automatic sensor zero offset adjustment (via digital interface or local push button)
  • NIST traceable certificate included
  • Self-diagnostic tests
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Specifications

Brand

Accuracy

  • 1.0 % of Full Scale

Communication

  • RS-232C, RS-485

Display

  • 2 Line x 16-Characters
  • LED Display

Enclosure, Body Material

  • Aluminum
  • Stainless Steel

Filter

  • 5 microns

Flow Rate

  • 0.35 to 3.53 scfm (10 to 100 L/minute)

Load Impedance

  • 3,000 ohms Min.

Loop Resistance

  • 500 ohms

Media

  • Clean Gases Compatible with Wetted Parts

O-Ring Material

  • Buna-N
  • Ethylene Propylene (EPR)
  • Fluoroelastomer
  • PTFE

Output

  • 0-5 Vdc
  • 4-20 mA

Power

  • 11-26 Vdc

Repeatability

  • ± 0.25 % of Full Scale

Response Time

  • 2 seconds to within ± 2 % of Actual Flow

Seat / Seal Material

  • Buna-N
  • Ethylene Propylene (EPR)
  • Fluoroelastomer
  • PTFE

Supply Pressure

  • psig: 500 (kPa: 3,450, bar: 34.5)

Temperature Range

  • 0° to 50° C (32° to 122° F)

Tube Connection

  • 1/4” Compression Fitting
  • 1/8” Compression Fitting
  • 3/8” Compression Fitting

Wetted Materials

  • 316 Stainless Steel
  • Aluminum - Anodized
  • Brass
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Typical Applications

  • Gas Flow Measurement
  • Gas Flow Control
  • Operating Pumps and Valves
  • Process Equipment
  • Vacuum Processes
  • Glass and Metal Coating
  • Film Deposition
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