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DigitalFlow GC868 - Clamp-On Gas Ultrasonic Flow Meter

DigitalFlow GC868 Clamp-on Gas Ultrasonic Flow Meter

 

GE's DigitalFlow GC868 gas ultrasonic flow meter is a fixed-installation flowmeter comprised of the GC868 electronics, a pair of advanced clamp-on ultrasonic transducers, a clamping fixture, a preamplifier located near the transducers and coaxial cables to connect the transducers to the preamplifier and GC868 electronics.

 

The DigitalFlow™ GC868 flow meter can be used to measure the flow of any gas or steam.

DigitalFlow GC868 Features

  • No wetted parts
  • One or two channels (paths)
  • No moving parts
  • Clamp-on; nonobstructive
  • No pressure drop
  • Simple installation
  • Temperatures up to 230 degrees C
  • Steam Mass Flow capability

The DigitalFlow GC868 clamp-on gas flowmeter is a complete ultrasonic flow metering system for measurement of most gases, including:

  • Natural gas
  • Compressed air
  • Fuel gases
  • Erosive gases
  • Corrosive gases
  • Toxic gases
  • High-purity gases
  • Air separation gases
  • Steam

 

Fluid Types Acoustically conductive gases with minimum density requirements (see Installation Requirements Table)
Pipe Sizes
  • Most gases: 0.75 to 24 in NB (20 to 600 mm DN) and larger
  • Steam: 4 to 12 in NB (100 to 300 mm DN)
Pipe Wall Thickness Thicker walled pipes require higher gas density (see Installation Requirements Table)
Pipe Materials Most metals and plastics. No lined pipes.
Flow Accuracy (Velocity)
  • For pipes 6 in (150 mm) and smaller: ±2% to 5% of reading typical
  • For pipes larger than 6 in (150 mm): ±1% to 2% of reading typical
Accuracy depends on pipe size and whether measurement is one-path or two-path. Accuracy to ±0.5% of reading may be achievable with process calibration.
Repeatability ±0.2% to 0.5% of reading
Range (Bidirectional) See Installation Requirements Table
Rangeability (Overall) See Installation Requirements Table Specifications assume a fully developed flow profile (typically 20 diameters upstream and 10 diameters downstream of straight pipe run) and flow velocity greater than 5 ft/s (1.5 m/s).
Measurement Parameters Standard and actual volumetric flow, and flow velocity

Electronics

Flow Measurement Correlation Transit-Time mode
Enclosures
  • Standard: Epoxy-coated aluminum Type 4X/IP66 Class I, Division 2, Groups A,B,C&D
  • Optional: Stainless steel, fiberglass, explosion-proof, flameproof II 2 G EEx d IIC T6)
Dimensions Standard: Weight 11 lb (5 kg), size (h x w x d) 14.24 x 11.4 x 5.1 in (362 x 290 x 130 mm)
Channels
  • Standard: One channel
  • Optional: Two channels (for two pipes or two-path averaging)
Display Two independent software-configurable 64 x 128 pixel backlit LCD graphic displays
Keypad 39-key, tactile-feedback membrane keypad
Power Supplies
  • Standard: 100 to 130 VAC, 50/60 Hz or 200 to 265 VAC, 50/60 Hz
  • Optional: 12 to 28 VDC, ±5%
Power Consumption 20 W maximum
Operating Temperature –10° to 55°C (14° to 130°F)
Storage Temperature –40° to 70°C (–40° to 158°F)
Standard Inputs/Outputs Two 0/4 to 20 mA isolated outputs, 550 Ω maximum load
Optional Inputs/Output There are six additional slots available for any combination of the following I/O boards:
  • Analog outputs: Select up to three additional output boards, each with four isolated 0/4 to 20 mA outputs, 1 kΩ maximum load
  • Analog inputs: Select up to three boards of one of the following types: –Analog input board with two isolated 4 to 20 mA inputs and 24 V loop power –RTD input board with two isolated, three-wire, RTD inputs; span –100° to 350°C (–148° to 662°F); 100 Ω Pt
  • Totalizer/frequency outputs: Select up to three totalizer/frequency output boards, each with four outputs per board, 10 kHz maximum. All boards allow software-selectable functioning in two modes: –Totalizer mode: Pulse per defined unit of parameter (e.g., 1 pulse/ft3) –Frequency mode: Pulse frequency proportional to magnitude of parameter (e.g., 10 Hz = 1 ft3/h)
  • Alarm relays: Select up to two boards of one of the following types: –General purpose: Relay board with three Form C relays; 120 VAC, 28 VDC maximum, 5 A maximum; DC 30 W maximum, AC 60 VA –Hermetically sealed: Relay board with three hermetically sealed Form C relays; 120 VAC, 28 VDC maximum, 2 A maximum; DC 56 W maximum, AC 60 VA
Digital Interfaces
  • Standard: RS232
  • Optional: RS485 (multiuser)
  • Optional: Modbus® RS458 or TCP protocol
  • Optional: Ethernet
  • Optional: OPC server
  • Optional: Foundation fieldbus
Site Parameter Programming Menu-driven operator interface using keypad and “soft” function keys
Data Logging Memory capacity (linear and/or circular type) to log more than 43,000 flow data points
Display Functions
  • Graphic display shows flow in numerical or graphic format
  • Displays logged data and diagnostics
European Compliance Complies with EMC Directive 89/336/EEC, 73/23/EEC LVD (Installation Category II, Pollution Degree 2)

Clamp-On Ultrasonic Flow

Transducers Temperature Ranges
  • Standard: –40° to 130°C (–40° to 266°F)
  • Optional (overall range): –40° to 230°C (–40° to 446°F)
Mountings Anodized aluminum or stainless steel clamping fixture with rigid rails, chain or strap
  • 0.75 to 1.25 in (20 to 30 mm) pipe: CFG-V1
  • 1.25 to 4 in (30 to 100 mm) pipe: CFG-V4
  • 4 to 8 in (100 to 200 mm) pipe: CFG-V8
  • 8 to 12 in (200 to 300 mm) pipe: CFG-V12
  • 12 to 24 in (300 to 600 mm) pipe: CFG-PI
Mounting Couplant CPL-16
Area Classifications
  • Standard: General purpose
  • Optional: Weatherproof Type 4X/IP65
  • Optional: Explosion-proof Class I, Division 1, Groups B,C,&D
  • Optional: Flameproof II 2 G EEx md IIC T6–T3

Descriptions English Français Italiano Português Español
Article: A Clamp-On Ultrasonic Flowmeter for Gases (1.6MB PDF) Article: A Clamp-On Ultrasonic Flowmeter for Gases (1.6MB PDF)
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GC 868 Brochure GC 868 Brochure
GC 868 Datasheet GC 868 Datasheet
GC868 1-CH Programming GC868 1-CH Programming
GC868 100-120 VAC Wiring Diagram, Single-Channel Unit GC868 100-120 VAC Wiring Diagram, Single-Channel Unit
GC868 100-120 VAC Wiring Diagram, Two-Channel Unit GC868 100-120 VAC Wiring Diagram, Two-Channel Unit
GC868 100-120 VAC Wiring Diagram, Two-Path Unit GC868 100-120 VAC Wiring Diagram, Two-Path Unit
GC868 12-28 VDC Wiring Diagram, Single-Channel Unit GC868 12-28 VDC Wiring Diagram, Single-Channel Unit
GC868 12-28 VDC Wiring Diagram, Two-Channel Unit GC868 12-28 VDC Wiring Diagram, Two-Channel Unit
GC868 12-28 VDC Wiring Diagram, Two-Path Unit GC868 12-28 VDC Wiring Diagram, Two-Path Unit
GC868 2-CH Programming GC868 2-CH Programming
GC868 200-240 VAC Wiring Diagram, Single-Channel Unit GC868 200-240 VAC Wiring Diagram, Single-Channel Unit
GC868 200-240 VAC Wiring Diagram, Two-Channel Unit GC868 200-240 VAC Wiring Diagram, Two-Channel Unit
GC868 200-240 VAC Wiring Diagram, Two-Path Unit GC868 200-240 VAC Wiring Diagram, Two-Path Unit
GC868 Brochure GC868 Brochure GC868 Brochure
GC868 Gas Flowmeter Interconnection Diagram, Single-Channel Unit GC868 Gas Flowmeter Interconnection Diagram, Single-Channel Unit
GC868 Gas Flowmeter Interconnection Diagram, Two-Channel Unit GC868 Gas Flowmeter Interconnection Diagram, Two-Channel Unit
GC868 Gas Flowmeter Interconnection Diagram, Two-Path Unit GC868 Gas Flowmeter Interconnection Diagram, Two-Path Unit
GC868 NEMA 7 (Cl.I, Div.1, Groups A-D) Package Outline & Installation Drawing GC868 NEMA 7 (Cl.I, Div.1, Groups A-D) Package Outline & Installation Drawing
GC868 Service Operating Manual GC868 Service Operating Manual
GC868 Standard NEMA 4 Package Outline & Installation Drawing GC868 Standard NEMA 4 Package Outline & Installation Drawing
GC868: Quick Start GC868: Quick Start
GGC868 NEMA 7 (Cl.I, Div.1, Groups A-D) Oversized Package Outline & Installation Drawing GGC868 NEMA 7 (Cl.I, Div.1, Groups A-D) Oversized Package Outline & Installation Drawing
MODBUS Communications for the GC868 Special MODBUS Communications for the GC868 Special
User's Guide User\'s Guide


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