DigitalFlow XMT868i - Ultrasonic Liquid Flow Transmitter

DigitalFlow XMT868i - Liquid Ultrasonic Transmitter

The XMT868i liquid flow transmitter combines state-of-the-art flow measurement capability with a low-cost transmitter package that measures only 8.2 by 6.6 in (20.1 by 16.8 cm), weighs only 10 lb (4.5 kg) and can be installed right at the process measurement point. The all-digital XMT868i has no moving parts and provides long-term, drift-free operation. An on-board microprocessor provides exclusive digital signal coding and correlation detection routines, automatic adjustment to changing fluid properties, dynamically configured operating software to simplify programming and built-in energy flow measurement.


DigitalFlow XMT868i Features

  • Low range: -40 to 40 ft/s (-12.2 to 12.2 m/s)
  • Pipe sizes ½ to 200 in (1.27 cm to 5.1 m)
  • Single- and dual-channel modes
  • RTDs for energy flow measurements (optional)
  • Data logging capabilities (optional)
  • Weatherproof/explosion-proof housing
  • Hydrocarbon liquids
  • Liquefied natural gas (LNG)
  • Crude oil
  • Lubricating oils
  • Diesel fuel oils
  • Solvents
  • Water and wastewater
  • Hot/chilled water
  • Chemicals
  • Beverages
  • Other liquids


Operation and Performance

Fluid Types Acoustically conductive fluids, including most clean liquids, and many liquids with entrained solids or gas bubbles. Maximum void fraction depends on transducer,
interrogation carrier frequency, path length and pipe configuration.
Pipe Sizes
  • Clamp-on transducers: 0.5 in to 300 in (12.7 mm to 7.6 m) and larger
  • Wetted transducers: 1 in to 200 in (25.4 mm to 5 m) and larger
Pipe Wall Thickness Up to 3 in (76.2 mm)
Pipe Materials All metals and most plastics. Consult GE for concrete,
composite materials, and highly corroded or lined pipes.
Flow Accuracy (Velocity) ±0.5% of reading (achievable with process calibration)
Typical Clamp-On Flow Accuracy (Velocity)
  • Pipe ID>6 in (150 mm): ±1% to 2% of reading
  • Pipe ID<6 in (150 mm): ±2% to 5% of reading
Typical Wetted Flow Accuracy (Velocity) ±1% of reading
Accuracy depends on pipe size, installation and whether measurement is one-path or two-path.
Repeatability ±0.1% to 0.3% of reading
Range (Bidirectional) –40 to 40 ft/s (–12.2 to 12.2 m/s)
Rangeability (Overall) 400:1
Specifi cations assume a fully developed fl ow profile (typically 10 diameters upstream and 5 diameters downstream of straight pipe run) and flow velocity greater than 1 ft/s (0.3 m/s).
Measurement Parameters Volumetric flow, totalized flow and flow velocity


Flow Measurement Patented Correlation Transit-Time™ mode
  • Standard: Epoxy-coated aluminum weatherproof Type 4X/IP66 Class I, Divison 1, Groups B, C & D; Class II, Groups E, F & G; Class III Flameproof II 2 GD EEx d IIC T5/T6
  • Optional: Stainless steel
Dimensions Standard: Weight 10 lb (4.5 kg), size (h x d) 8.2 in x 6.6 in
(208 mm x 168 mm)
  • Standard: One channel
  • Optional: Two channels (for two pipes or two-path averaging)
Display Optional: two-line x 16-character backlit LCD display, configurable to display up to four measurement parameters in sequence
Keypad Built-in infrared, six-button keypad, for full functionality
Power Supplies
  • Standard: 90-260 VAC
  • Optional: 12 to 28 VDC, ± 5%
Power Consumption 20W maximum
Operating Temperature -4°F to 140°F (-20°C to +60°C)
Storage Temperature –67°F to 167°F (–55°C to 75°C)
Standard Inputs/Outputs Two 0/4 to 20 mA isolated outputs, 600 S maximum load
Optional Inputs/Outputs Optional Inputs/Outputs
All analog and digital I/O are available in specific
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 S platinum
  • Two or four pulse or frequency outputs, optically isolated, 3A maximum, 100 VDC maximum, 1W maximum, from DC to 10 kHz  maximum
  • Alarm relays
Digital Interfaces
  • Standard: RS232
  • Optional: RS485 (multiuser)
  • Optional: HART® protocol
  • Optional: Modbus® protocol
  • Optional: Foundation Fieldbus®
  • Optional: OPC server
  • Optional: Ethernet
Data Logging
  • Standard: None
  • Optional: Memory capacity (linear and/or circular type) to log up to 150,000 flow 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

Clamp-On Ultrasonic Flow Transducers

Temperature Ranges
  • Standard: -40° to 150°C (-40° to 302°F)
  • Optional: -200° to 400°C (-328C to 752°F)

See specific transducer for exact temperature range.

Mountings Stainless steel chain or strap, welded or magnetic clamping fixtures
Area Classifications
  • Standard: General purpose
  • Optional: Weatherproof Type 4X/IP66
  • Optional: Explosion-proof, Class I, Division 1, Groups B, C & D; Class II, Groups E, F & G; Class III
  • Optional: Flameproof (ll 2 GD Eex md llC T6 T=80°C)

Wetted Ultrasonic Flow Transducers

Temperature Ranges
  • Standard: –40°F to 212°F (–40°C to 100°C)
  • Optional (overall range): –310°F to 1112°F (–190°C to 600°C)
Pressure Ranges
  • Standard: 0 to 3000 psig (1 to 207 bar)
  • Optional: Higher pressures on request
  • Standard: Stainless steel
  • Optional (for Pan-Adapta® Plugs): Titanium, Hastelloy® alloy, Monel® alloy, duplex, CPVC, PVDF and others
Pan-Adapta plugs allow installation and removal of wetted transducers without interrupting the process or emptying the pipe.
Process Connections
  • Standard: 1 in or 3/8 in NPTM
  • Optional: RF fl anged, socket weld, fuse bond and others
Mountings Flanged flowcell, hot tap or cold tap
Area Classifications
  • Standard: General purpose
  • Optional: Weatherproof Type 4X/IP66
  • Optional: Class I, Division 1, Groups B, C & D; Class II, Groups E, F & G; Class III
  • Optional: Flameproof II 2 G EEx d IIC T6 
  • Optional: Submersible
Transducer Cables
  • Standard: One pair of coaxial cables, type RG62 AU, or as specified for transducer type
  • Optional: Lengths up to 1000 ft (330 m) maximum
High-Temperature and High-Pressure Ultrasonic Flow Transducers

Clamp-on: Clamp-on Extended Temperature Range Transducer System (see C-ET System specifications)

Wetted: Bundle Waveguide Technology™ System transducer and holder (see BWT™ System specifications)

Energy Measurement Calculates energy flow rate and totalized energy. Requires optional RTD or analog I/O board.
Temperature Transducers Loop-powered, three-wire, platinum RTDs; clamp-on and wetted (thermo-well) types are available
Accuracy ±0.15°C with wetted RTDs (matched pairs)
Range -4°F to 500°F (-20C° to 260°C)

The accuracy of the energy measurement is a combination of the accuracy of the associated flow and temperature measurements. 1% to 2% of reading is typical for calibrated systems. Not all extremes of parameters can be achieved simultaneously.

Additional Options

PanaView™ PC Interface Software The DigitalFlow XMT868i communicates with a PC through a serial interface and Windows® operating systems. Consult the manual for details on sites, logs and other operations with a PC.
Descriptions English Français Italiano Nederlands Português
CF-LP Calibration Factor CF-LP Calibration Factor
Foundation Fieldbus Configuration for XMT868/XMT868i meters Foundation Fieldbus Configuration for XMT868/XMT868i meters
XMT868i Datasheet XMT868i Datasheet XMT868i Datasheet XMT868i Datasheet XMT868i Datasheet XMT868i Datasheet
XMT868i Guide XMT868i Guide
XMT868i Programming Manual XMT868i Programming Manual
XMT868i Service Manual XMT868i Service Manual
XMT868i Startup Guide XMT868i Startup Guide

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