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DigitalFlow GF868 - Flare Gas Mass Ultrasonic Flow Meter

DigitalFlow GF868 - Flare Gas Mass Ultrasonic Flowmeter

The GF868 flare gas flow meter improves the efficiency of petrochemical plants, refineries and offshore platforms. It uses a proprietary algorithm to determine instantaneously the molecular weight and mass flow rate of the flare gas. The meter is used to conserve energy and reduce product loss by identifying sources of leaks into the flare systems. It also helps improve compliance with pollution-control regulations and reduces energy usage by accurately controlling the amount of steam fed to the flare tip.

The GF868 flow meter operates reliably even under unsteady flow, pulsating pressure, varying composition and temperature, harsh environments and the wide flow ranges typical of flare systems. Flow velocity is measurable from 0.1 to 394 ft/s (0.03 to 120 m/s) in pipes or stack sizes up to 120 in (3 m) in diameter. There are no moving parts or orifices to wear or clog. The GF868 flow measurement is independent of the gas properties, and it does not require regular maintenance

DigitalFlow GF868 Features

  • Velocity range: 0.1 to 394 ft/sec (0.03 to 120 m/s)
  • Bi-directional velocity range: 0.1 to 328 ft/s (0.03 to 100 m/s)
  • Velocity, mass and volumetric flow
  • Instantaneous gas molecular weight
  • Measurement independent of composition
  • No moving parts; nothing to clog or wear out
  • No regular maintenance required

The DigitalFlow GF868 flowmeter is a complete ultrasonic flow metering system for:
  • Flare gas
  • – Track down or prevent losses from leakage with positive material identification
  • – Account for total plant throughput of material
  • – Reduce cost of steam usage with proportional control
  • – Conserve energy by eliminating unnecessary flaring
  • – Comply with government regulations for pollution control
  • Vent gas

Operation and Performance

Fluid Types Flare and vent gases
Pipe Materials All metals, fiberglass. Consult GE for other materials.

Standard (100 m/s)
Extended Range (120 m/s)
Pipe Sizes
Diagonal 45 2 in to 14 in (50 to 350 mm) NB ANSI 4 in to 12 in (100 to 300 mm) NB ANSI
Bias 90 16 in to 120 in (400 to 3000 mm) NB ANSI 14 in to 120 in (350 to 3000 mm) NB ANSI
Flow Accuracy (Velocity)
Flow Range ±1 ft to ±328 ft/s (0.3 to ±100 m/s) 1 ft to 394 ft/s (0.3 to +120 m/s)
One Path ±2-5% ±2-5%
Two Path ±1.4-3.5% ±1.4-3.5%
Flow Range 0.1 to ±1 ft (0.03 to ±0.3 m/s) 0.1 to +1 ft (0.03 to ±0.3 m/s)
One Path ±0.15 in/s (±0.004 m/s) ±0.24 in/s ( ±0.006 m/s)
Two Path ±0.12 in/s ( ±0.003 m/s) ±0.015 in/s (±0.004 m/s)
Range (Overall) -328 to 328 ft/s (-100 to 100 m/s) (Bidirectional) 0.1 to 394 ft/s (0.03 to 120 m/s) (Non-Bidirectional)
Rangeability (Overall) 3280:1 3940:1
Molecular Weight Accuracy (Hydrocarbon Mixtures) 2 to 120 gr/gr mole ±1.8% 2 to 6 gr/gr mole ±2-10%
6 to 120 gr/gr mole ±1.8-2%
Mass Flow Accuracy (Note 1) (Hydrocarbon Mixtures)
One Path 3% to 7% 3% to 7%
Two Path 2.4% to 5% 2.4% to 5%
Note 1: Dependent on accuracy of temperature and pressure inputs

Repeatability ±1.0% at 1 to 394 ft/s (30 cm/s to 120 m/s)
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.
Specifications assume a fully developed flow profile (typically 20 diameters upstream and 10 diameters downstream of straight pipe run) and flow velocity greater than 1 ft/s (0.3 m/s).
Measurement Parameters Mass flow, standard and actual volumetric flow, totalized flow, molecular weight, speed of sound, and flow velocity

Electronics

Flow Measurement Patented Correlation Transit-Time mode
Enclosures Standard: Epoxy-coated aluminum weatherproof Type 4X/IP66 Class I, Division 2, Groups A,B,C & D FM and CSA
Optional: Stainless steel, fiberglass, explosion-proof, flameproof
Dimensions Weight 11 lb (5 kg)
Size (h x w x d) 14.24 in x 11.4 in x 5.12 in (362 mm x 290 mm 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
Power Consumption 20W maximum
Operating Temperature –4°F to 131°F (–20°C to 55°C)
Storage Temperature –67°F to 167°F (–55°C to 75°C)
Standard Inputs Two isolated 0/4 to 20 mA inputs (121W ) with integral 24 VDC power supply
For required temperature and pressure inputs
Standard Outputs Six 4 to 20 mA outputs, software assignable
Two outputs with 550W maximum load
Four outputs with 1000W maximum load.
Optional Inputs/Outputs

There are four additional slots available for any combination of the following I/O boards:

Analog output board with four isolated 0/4 to 20 mA outputs, 1 kW maximum load

Analog input board:,two types
– With two isolated 4 to 20 mA inputs and 24V loop power
– With two isolated, three-wire, 100W RTD inputs; span
–148°F to 662°F (–100°C to 350°C);

Totalizer/frequency output board
– With four outputs per board, 10-kHz maximum.
–Software-selectable functioning in two modes
–Totalizer mode: Pulse per defined unit of parameter (e.g., 1 pulse/ft3 or 1 pulse/0.028 m3)
– Frequency mode: frequency proportional to rate of parameter (e.g., 10 Hz = 1 ft3/h or 0.028 m3/h)

Alarm relay board with three hermetically sealed Form C relays; 120 VAC, 28 VDC maximum, 2A maximum;
DC 56W maximum, AC 60 VA

Digital Interfaces Standard: RS232
Optional: RS485 (multiuser)
Optional: HART® protocol
Optional: Modbus® RS485 or TCP/IP
Optional: Ethernet TCP/IP
Optional: OPC server
Optional: Foundation Fieldbus
Display Functions Graphic display shows flow in numerical or graphic format
Displays logged data and diagnostics
European Compliance Complies with EMC Directive 2004/108/EC, 2006/95/EC LVD (Installation Category II, Pollution Degree 2) and PED 97/23/EC for DN<25

Descriptions English Français Deutsch Italiano Português
Communications options (Full manual) Communications options (Full manual)
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GF868 1-CH Operating Manual GF868 1-CH Operating Manual
GF868 100-120 VAC Wiring Diagram, Single-Channel Unit GF868 100-120 VAC Wiring Diagram, Single-Channel Unit
GF868 100-120 VAC Wiring Diagram, Two-Channel Unit GF868 100-120 VAC Wiring Diagram, Two-Channel Unit
GF868 100-120 VAC Wiring Diagram, Two-Path Unit GF868 100-120 VAC Wiring Diagram, Two-Path Unit
GF868 12-28 VDC Wiring Diagram, Single-Channel Unit GF868 12-28 VDC Wiring Diagram, Single-Channel Unit
GF868 12-28 VDC Wiring Diagram, Two-Channel Unit GF868 12-28 VDC Wiring Diagram, Two-Channel Unit
GF868 12-28 VDC Wiring Diagram, Two-Path Unit GF868 12-28 VDC Wiring Diagram, Two-Path Unit
GF868 2-CH Operating Manual GF868 2-CH Operating Manual
GF868 220-240 VAC Wiring Diagram, Single-Channel Unit GF868 220-240 VAC Wiring Diagram, Single-Channel Unit
GF868 220-240 VAC Wiring Diagram, Two-Channel Unit GF868 220-240 VAC Wiring Diagram, Two-Channel Unit
GF868 220-240 VAC Wiring Diagram, Two-Path Unit GF868 220-240 VAC Wiring Diagram, Two-Path Unit
GF868 Brochure(PDF) GF868 Brochure(PDF) GF868 Brochure(PDF) GF868 Brochure(PDF) GF868 Brochure(PDF)
GF868 Gas Flowmeter Interconnection Diagram, Single-Channel Unit GF868 Gas Flowmeter Interconnection Diagram, Single-Channel Unit
GF868 Gas Flowmeter Interconnection Diagram, Two-Channel Unit GF868 Gas Flowmeter Interconnection Diagram, Two-Channel Unit
GF868 Gas Flowmeter Interconnection Diagram, Two-Path Unit GF868 Gas Flowmeter Interconnection Diagram, Two-Path Unit
GF868 NEMA7 (Cl.1, Div.1, Groups A-D) Oversized Package Outline & Installation GF868 NEMA7 (Cl.1, Div.1, Groups A-D) Oversized Package Outline & Installation
GF868 NEMA7 (Cl.1, Div.1, Groups A-D) Package Outline & Installation Drawing GF868 NEMA7 (Cl.1, Div.1, Groups A-D) Package Outline & Installation Drawing
GF868 Operating Manual GF868 Operating Manual
GF868 Quick Start GF868 Quick Start
GF868 Service Manual GF868 Service Manual
GF868 Standard NEMA 4X, Wall-Mount Package Outline & Installation Drawing GF868 Standard NEMA 4X, Wall-Mount Package Outline & Installation Drawing
HART Communications HART Communications
MODBUS Communications for the GF868 MODBUS Communications for the GF868

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