DigitalFlow DF868 - Ultrasonic Liquid Flow Meter

DigitalFlow DF868 - Liquid Ultrasonic Flowmeter

GE's DF868 ultrasonic liquid flow meter is a fixed-installation meter based on our award-winning TransPort PT868 portable ultrasonic liquid flow meter. The DF868 is available with two built-in measuring modes. Using clamp-on flow transducers, the DF868 flow meter measures flow rate through metal, plastic or even concrete-lined pipes without penetrating the pipe wall.

GE's Transit-Time mode, with advanced signal coding and correlation detection methods, provides drift-free flow measurements in ultraclean to dirty liquids. This mode handles 80 percent of multiphase liquids-including fluids with gas bubbles, liquid droplets and entrained solids-that previously required Doppler-type meters because conventional transit-time meters failed. Using advanced technology available only from GE, an innovative TransFlection mode expands the DF868 flowmeter’s measuring capabilities to include applications previously handled only by Doppler meters, such as raw sewage, sludge, slurries and other extremely attenuating multiphase fluids. An optional dual-channel/dual-path model can be configured for a variety of uses including flow measurement in two different pipes, leak detection by measuring at two different locations on the same pipe and dual-path measurement at one location for maximum accuracy.


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  • Pipes from ½ to 200 in (1.27 cm to 5.1 m)
  • Single-and dual-channel modes
  • Built-in 43,000-point datalogger
  • Two independent programmable graphic LCDs
  • Automatic tracking window for best accuracy when fluid conditions change
  • TransFlection® mode for difficult multiphase fluids

The DF868 liquid flowmeter is a complete ultrasonic flow metering system for measurement of:

  • Water and wastewater
  • Hot/chilled water
  • Water/glycol solutions
  • Refined hydrocarbons
  • Petroleum products
  • Crude oil
  • Lubricating oils
  • Diesel and fuel oils
  • Solvents
  • Chemicals
  • 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 Using clamp-on transducers: 0.5 to 300 in (12.7 mm to 7.6 m) and larger
Using wetted transducers: 1 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
Specifications assume a fully developed flow 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
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 5.1 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 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

-4°F to 131°F (-20°C to 55°C)

Storage Temperature -67°F to 167°F (-55°C to 75°C) 
Standard Inputs/Outputs Two 0/4 to 20 mA isolated outputs, 550 W maximum load

Descriptions Chinese English Français Deutsch Italiano Português Español
CF-LP Calibration Factor CF-LP Calibration Factor
DF868 1-CH Programming Manual DF868 1-CH Programming Manual
DF868 100-120VAC Wiring Diagram Drawing DF868 100-120VAC Wiring Diagram Drawing
DF868 12-28VDC Wiring Diagram Drawing DF868 12-28VDC Wiring Diagram Drawing
DF868 2-CH Programming Manual DF868 2-CH Programming Manual
DF868 220-240VAC Wiring Diagram Drawing DF868 220-240VAC Wiring Diagram Drawing
DF868 Datasheet DF868 Datasheet DF868 Datasheet DF868 Datasheet DF868 Datasheet DF868 Datasheet DF868 Datasheet DF868 Datasheet
DF868 Service Manual DF868 Service Manual
DF868 Standard NEMA 4X Package DF868 Standard NEMA 4X Package
DF868 Startup Guide DF868 Startup Guide
MODBUS Communications for the DF868 MODBUS Communications for the DF868
Ultrasonic Transducer Installation Guide for Liquids Ultrasonic Transducer Installation Guide for Liquids
User`s Guide User`s Guide

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