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DigitalFlow XGM868i - Gas Flow Ultrasonic Transmitter

DigitalFlow XGM868i - Gas Flow Ultrasonic Transmitter

 

The XGM868i gas flow transmitter is a low-cost, transmitter-based version of the GM868 general-purpose gas flow meter. Like the GM868 flow meter, the XGM868i transmitter uses the ultrasonic transit-time technique for measuring gas flow. It measures flow in virtually every gas in any pipe or duct size from 1 to 120 in (2.5 cm to 3 m) and larger.

 

The transmitter is weatherproof and approved for use in hazardous areas. The wetted transducer designs offer low pressure drop, low maintenance, and accurate measurement over a wide range of flows and compositions.

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DigitalFlow XGM868i Specification

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

Applications


The DigitalFlow XGM868i gas fl ow transmitter is a complete ultrasonic fl ow metering system for measurement of most gases including:
  • Hydrocarbon gases
  • Vent gases
  • Biogases
  • Digester gases
  • Fuel gases
  • Waste gases
  • Incinerator air fl ow
  • Vapor recovery
  • Stack gases
  • Other gases

Specifications

Fluid Types Acoustically conductive gases
Pipe Sizes 2 to 120 in. NB (50 to 3,000 mm) 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 ft/s to 150 ft/s (–46 m/s 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 flow, totalized flow, and flow velocity

Electronics

Flow Measurement Transit time
Enclosures
  • Standard: Epoxy-coated aluminum Type 4X/IP66 Class I, Division 1, Groups B,C&D Flameproof ISSeP
    02ATEX008 II 2 GD EEx d IIC T5 IP66 T95°C
  • Optional: Stainless steel
Dimensions (h x d) Standard: Size 8.2 in x 6.6 in (208 mm x 168 mm), weight 10 lb (4.5 kg)
Channels
  • Standard: One channel
  • Optional: Two channels (for two pipes or two-path averaging)
Display Optional: 2 line x 16 character backlit LCD display, confi gurable to display up to four measurement parameters in sequence
Keypad Built-in infrared, six-button keypad for full functionality operation
Power Supplies
  • Standard: 90-260 VAC
  • Optional: 12 to 28 VDC, ±5%
Power Consumption 20 W maximum
Operating Temperature –40°F to 140°F (–40°C to 60°C)
Storage Temperature –67F° to 167°F (–55°C to 75°C)
Standard Inputs/Outputs Two 0/4 to 20 mA isolated outputs, 600 Ω maximum load
Optional Inputs/Outputs All analog and digital I/O are available in specifi c combinations. Consult GE for available option cards.
  • Two additional 0/4 to 20 mA isolated outputs, 1000 Ω maximum load
  • Two 4 to 20 mA isolated inputs, 24 VDC loop power
  • Two or four isolated, three-wire RTD (temperature) inputs, –148°F to 662°F (–100°C to 350°C), 100 Ω platinum
  • Two or four pulse or frequency outputs, optically isolated, 3 A maximum, 100 VDC maximum, 1 W maximum, from DC to 10 KHz maximum
  • Alarm relays: – Two or four Form C relays; 120 VAC, 28 VDC maximum, 5 A maximum; DC 30 W maximum, AC 60 VA maximum
Digital Interfaces
  • Standard: RS232
  • Optional: RS485 (multiuser)
  • Optional: Modbus® RS485 or TCP protocol
  • Optional: Ethernet
  • Optional: OPC server
  • Optional: Foundation Fieldbus®
Data Logging
  • Standard: None
  • Optional: Memory capacity (linear and/or circular type) to log over 150,000 fl ow data points
European Compliance System complies with EMC Directive 89/336/EEC, 73/23/ EEC LVD (Installation Category II, Pollution Degree 2) and transducers comply with PED 97/23/EC for DN<25
Temperature Range Standard: –58°F to 302°F (–50C° to 150°C) • Optional (overall): –310°F to 842°F (–190°C to 450°C)
Pressure Range
  • Standard: 0 psig to 2700 psig (1 bar to 187 bar)
  • Optional: 3480 psig (240 bar) maximum
Materials
  • Standard: Titanium
  • Optional: Monel® or Hastelloy® alloys
Process Connections Flanged and compression fi ttings
Mountings Flowcell or cold tap
Area Classif cations
  • Standard: General purpose
  • Optional: Weatherproof Type 4X/IP66
  • Optional: Explosion-proof Class I, Division 1, Groups B,C,&D
  • Optional: Flameproof II 2 GD EEx d IIC T6
Transducers and fl owcells for specifi c applications are available. Consult GE for details.
Transducer Cables
  • Standard: One pair of coaxial cables, type RG62 AU, or as specifi ed for transducer type
  • Optional: Lengths up to 1000 ft (330 m) maximum
High-Temperature and High-Pressure
Ultrasonic Flow Transducers
Bundle Waveguide Technology™ (BWT) System transducer and holder (see BWT System specifi cations) are available.

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