AquaTrans AT868 - Ultrasonic Water Flow Meter

AquaTrans AT868 - Liquid Flow Ultrasonic Transmitter

GE's AquaTrans AT868 ultrasonic water flow meter is a rugged, low-cost transmitter package that can be installed right at the process measurement point. It is designed specifically for municipal applications such as water, wastewater and sewage. Setup and service can be done via the transmitter’s internal keypad or by connecting the AT868 to a laptop PC and using GE's instrument interface software.

Accuracy is typically one to two percent of reading with clamp-on transducers, and better than one percent with wetted transducers. Flow measurement range is 0.1 to 40 ft/s (0.03 to 12.2 m/s), for a turndown ratio of 400 to 1. Measurement is obstructionless, causing no pressure drop and is noncontaminating.


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  • Noninvasive clamp-on or wetted transducers
  • Flow range 0.1 to 40 ft/s (0.03 to 12.2 m/s)
  • Velocity, volumetric and totaled flow
  • One analog output and one frequency/pulse totalizer output standard
  • Internal keypad for field programming
  • Low-cost package

The AquaTrans AT868 liquid flow transmitter is a complete ultrasonic flow metering system for measurement of:

  • Potable water
  • Wastewater
  • Sewage
  • Discharge water
  • Treated water
  • Cooling and heating water
  • 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 to 300 in. (12.7 mm to 7.6m) 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 and 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
Enclosure Epoxy-coated aluminum weatherproof Type 4X/IP66
Dimensions Standard: Weight 2 lb (0.9 kg),
size (h x w x d) 7.25 in x 5.9 in x 3.5 in (184 mm x 150 mm x 89 mm)
  • Standard: One channel
  • Optional: Two channels (for two pipes or two-path averaging)
Display 2-line x 16 character backlit LCD display, configurable to display up to four measurement parameters in sequence
Keypad Six-button internal keypad
Power Supplies
  • Standard: 85 to 265 VAC, 50/60 Hz
  • Optional: 12 to 28 VDC, ± 5%
Power Consumption 20W maximum
Operating Temperature 14°F to 131°F (–10°C to 55°C)
Storage Temperature –40°F to 158°F (–40°C to 70°C)
Standard Inputs/Outputs
  • One 0/4 to 20 mA isolated output per channel, 600 O maximum load
  • One frequency/pulse rate/totalizer output per channel, optically isolated, 3A maximum, 100 VDC maximum, 1W maximum, from 0.1 to 10 kHz
Digital Interfaces
  • Standard: RS232
  • Optional: RS485 (multiuser)
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 4/IP65
  • Optional: CSA certified (Class I, Division 1, Groups B, C and D)
  • Optional: ATEX certified (ll 2 GD Eex md llC T6 T=80°C)
  • Optional: Submersible IP67/68

Wetted Ultrasonic Flow Transducers

Temperature Range –40°F to 212°F (–40°C to 100°C)
Pressure Range 0 to 3000 psig (1 to 207 bar)
  • 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 flanged, socket weld, fuse bond and others
Mountings Flanged flowcell, hot tap or cold tap
Area Classifications
  • Standard: General purpose
  • Optional: Weatherproof Type 4/IP65 submersible
  • Optional: Submersible IP67/68
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
Additional Options PanaView™ PC-Interface Software The AquaTrans AT868 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 Deutsch Italiano Português Español
AT868 (with Keypad 1-CH or 2-CH) User`s Manual AT868 (with Keypad 1-CH or 2-CH) User`s Manual
AT868 (without Keypad 1-CH only) User`s Manual AT868 (without Keypad 1-CH only) User`s Manual
AT868 Datasheet AT868 Datasheet AT868 Datasheet AT868 Datasheet AT868 Datasheet AT868 Datasheet AT868 Datasheet
AT868 Wall Mount Outline & Installation Drawing AT868 Wall Mount Outline & Installation Drawing
AT868 Wiring Diagram AT868 Wiring Diagram
CF-LP Calibration Factor CF-LP Calibration Factor