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DigitalFlow GM868 - General Purpose Gas Ultrasonic Flow Meter

DigitalFlow GM868 - General Purpose Gas Ultrasonic Flowmeter

The DigitalFlow™ GM868 general-purpose flow meter measures gas flow in pipes or ducts ranging from ½ in (1.27 cm) tubing to flue stacks greater than 25 ft (7.6 m) in diameter with appropriate transducers. Innovative configurations for installation of its ultrasonic transducers meet pipe or duct size and other application-oriented requirements. This obstructionless meter has very wide rangeability, causes no pressure drop, and requires no regular maintenance. Analog and digital outputs in velocity and actual volumetric flow rate are standard.

DigitalFlow GM868 Features

 

 

 

 

 

 

  • General-purpose gas flowmeter
  • Velocity range: 0.1 to 150 ft/s (0.03 to 46 m/s)
  • Obstructionless; no pressure drop
  • No moving parts; maintenance-free
  • Tolerates dirty flow streams

The DigitalFlow GM868 flow transmitter is a complete ultrasonic flow metering system for measurement of most gases including:

  • Hydrocarbon gases
  • Vent gases
  • Biogases
  • Digester gases
  • Fuel gases
  • Waste gases
  • Incinerator air flow
  • Vapor recovery
  • Stack gases
  • Other gases

Operation and Performance

Fluid Types All acoustically conductive gases
Pipe Sizes 2 in to 120 in (50 mm to 3,000 mm) NB and larger
Pipe Materials All metals. Consult GE for other materials.
Flow Accuracy (Velocity) ±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) –150 to 150 ft/s (–46 to 46 m/s)
Rangeability (Overall) 150:1
Specifications assume a fully developed flow profile (typically 20 diameters upstream and 10 diameters downstream of straight pipe run) and flow velocity greater than 3 ft/s (1 m/s).
Measurement Parameters Mass flow, standard and actual volumetric flow, totalized flow, 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
  • Optional: Stainless steel, fiberglass, explosion-proof, flameproof
Dimensions Standard: 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 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 20W maximum
Operating Temperature –4° to 131°F (–20° to 55°C)
Storage Temperature –67° to 167°F (–55° to 75°C)
Standard Inputs/Outputs Two 0/4 to 20 mA isolated outputs, 550 S maximum load
Optional Inputs/Outputs 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, 1kS 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 24V loop power
  • – RTD input board with two isolated, three-wire, RTD
  • inputs; span –100° to 350°C (–148° to 662°F); 100 S
  • Totalizer/frequency outputs: Select up to three totalizer/frequency output boards, each with four outputs per board, 10 kHz maximum
  • Alarm relays: Select up to two boards of one of the following types:
  • –General purpose: Relay board with three Form C relays
  • –Hermetically sealed: Relay board with three
  • hermetically sealed Form C relays
Digital Interfaces
  • Standard: RS232 • Optional: RS485 (multiuser)
  • Optional: Modbus® RS485 or TCP protocol
  • Optional: Ethernet
  • Optional: OPC server
  • Optional: Foundation fieldbus
Data Logging Memory capacity (linear and/or circular type) to log over 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) and PED 97/23/EC for DN<25

Wetted Ultrasonic Flow Transducers

Temperature Ranges
  • Standard: –58° to 302°F (–50° to 150°C)
  • Optional (overall range): –310° to 842°F (–190° to 450°C)
Pressure Ranges
  • Standard: 0 to 2,700 psig (1 to 187 bar)
  • Optional: 3480 psig (240 bar) maximum
Transducer Materials
  • Standard: Titanium
  • Optional: Monel® or Hastelloy® alloys
Process Connections Flanged and compression fittings
Mountings Flanged flowcell or cold tap
Area Classifications
  • Standard: General purpose
    Optional: Weatherproof Type 4X/IP66
  • Optional: Explosion-proof Class I, Division 2, ATEX
Transducer Cables One pair of RG62 AU coaxial cables, 1000 ft (330 m)
High-Temperature and High-Pressure Ultrasonic Flow Transducers Bundle Waveguide Technology™ System transducer and holder (see BWT™ System specifications) Pressure and temperature transducers available on request.

Descriptions Chinese English Français Deutsch Italiano Português Español
GM868 General Purpose Gas Ultrasonic Flowmeter  GM868 General Purpose Gas Ultrasonic Flowmeter
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GM868 100-120 VAC Wiring Diagram, Single-Channel Unit GM868 100-120 VAC Wiring Diagram, Single-Channel Unit
GM868 100-120 VAC Wiring Diagram, Two-Channel Unit GM868 100-120 VAC Wiring Diagram, Two-Channel Unit
GM868 100-120 VAC Wiring Diagram, Two-Path Unit GM868 100-120 VAC Wiring Diagram, Two-Path Unit
GM868 12-28 VDC Wiring Diagram, Single-Channel Unit GM868 12-28 VDC Wiring Diagram, Single-Channel Unit
GM868 12-28 VDC Wiring Diagram, Two-Channel Unit GM868 12-28 VDC Wiring Diagram, Two-Channel Unit
GM868 12-28 VDC Wiring Diagram, Two-Path Unit GM868 12-28 VDC Wiring Diagram, Two-Path Unit
GM868 200-240 VAC Wiring Diagram, Single-Channel Unit GM868 200-240 VAC Wiring Diagram, Single-Channel Unit
GM868 200-240 VAC Wiring Diagram, Two-Channel Unit GM868 200-240 VAC Wiring Diagram, Two-Channel Unit
GM868 200-240 VAC Wiring Diagram, Two-Path Unit GM868 200-240 VAC Wiring Diagram, Two-Path Unit
GM868 Datasheet GM868 Datasheet
GM868 Flowmeter GM868 Flowmeter
GM868 Flowmeter 1-CH Operating Manual GM868 Flowmeter 1-CH Operating Manual
GM868 Flowmeter 2-CH Operating Manual GM868 Flowmeter 2-CH Operating Manual
GM868 Flowmeter Operating Manual GM868 Flowmeter Operating Manual
GM868 Gas Flowmeter Interconnection Diagram, Single-Channel Unit GM868 Gas Flowmeter Interconnection Diagram, Single-Channel Unit
GM868 Gas Flowmeter Interconnection Diagram, Two-Channel Unit GM868 Gas Flowmeter Interconnection Diagram, Two-Channel Unit
GM868 Gas Flowmeter Interconnection Diagram, Two-Path Unit GM868 Gas Flowmeter Interconnection Diagram, Two-Path Unit
GM868 NEMA 7 (Cl.I, Div.1, Groups A-D) Oversized Package Outline & Installation Drawing GM868 NEMA 7 (Cl.I, Div.1, Groups A-D) Oversized Package Outline & Installation Drawing
GM868 NEMA 7 (Cl.I, Div.1, Groups A-D) Package Outline & Installation Drawing GM868 NEMA 7 (Cl.I, Div.1, Groups A-D) Package Outline & Installation Drawing
GM868 Standard NEMA 4 Package Outline & Installation Drawing GM868 Standard NEMA 4 Package Outline & Installation Drawing
MODBUS Communications MODBUS Communications
User's Guide User\'s Guide
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