AquaTrans™
AT868

Panametrics liquid flow
ultrasonic transmitter
Applications

Features

The AquaTrans AT868 liquid flow transmitter is a complete
ultrasonic flow metering system for measurement of:• Economical non-intrusive flow measurement• Potable water• Wastewater• Sewage• Discharge water• Treated water• Cooling and heating water• Other liquids• Simple setup and installation• Suitable for wide range of pipe sizes and materials• Suitable for lined pipes• Two-channel/two-path version available• Velocity, volumetric and totalized flow
• Internal keypad for field programmingLiquid flow ultrasonic transmitter
The AquaTrans AT868 liquid flow ultrasonic transmitter
combines state-of-the-art flow measurement capability witha low-cost transmitter package that can be installed right at
the process measurement point. It’s designed specifically forwater and wastewater applications in full pipes.
The all-digital AquaTrans AT868 has no moving parts andrequires minimal maintenance. An onboard microprocessor
uses patented Correlation Transit-Time™ technology forlong-term, drift-free operation. Automatic adjustment
to changing fluid properties and dynamically configured
operating software simplify programming.

Transit-time flow measurement technique
The transit-time technique uses a pair of transducers witheach transducer sending and receiving coded ultrasonicsignals through the fluid. When the fluid is flowing, signaltransit-time in the downstream direction is shorter than in
the upstream direction; the difference between these transit
times is proportional to the flow velocity. The AquaTransAT868 measures this time difference and uses programmed
pipe parameters to determine flow rate and direction.

Wetted or clamp-on transducers

AT868 specifications
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 configurations.
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 Panametrics forconcrete, 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

Ultrasonic flow transducers are classified as either wetted or
non-wetted (clamp-on). Clamp-on transducers are clamped
onto the outside of the pipe and never come into contact withthe process fluid. Wetted transducers are mounted into thepipe or flowcell in direct contact with the process fluid.

• Pipe ID<6 in (150 mm): ±2% to 5% of reading

Clamp-on transducers offer maximum convenience,
flexibility and a low installation cost compared to traditional
flow metering technologies. With proper installation, wetted
transducers provide maximum accuracy (better than 1% ofreading) in most applications.

Repeatability±0.1% to 0.3% of reading

Two-channel model
An optional second channel provides the capability tomeasure flow in two pipes or average two paths on the same
pipe for increased accuracy.

Typical wetted flow accuracy (velocity)±1% of reading
Accuracy depends on pipe size and installation and whether
measurement is one-path or two path.

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

Electronics
Flow measurement
Patented correlation transit-time mode
Enclosures
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)
Channels• Standard: One channel• Optional: Two channels (for two pipes or two-pathaveraging)Display
2-line x 16 character backlit LCD display, configurable todisplay up to four measurement parameters in sequence
KeypadSix-button internal keypad
Power supplies• Standard: 85 to 265 VAC, 50/60 Hz• Optional: 12 to 28 VDC, ± 5%Power consumption
20 W 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 Ωmaximum load

• One frequency/pulse rate/totalizer output per channel,
optically isolated, 3A maximum, 100 VDC maximum, 1Wmaximum, from 0.1 to 10 kHz

Wetted ultrasonic flow transducers
Temperature ranges–40°F to 212°F (–40°C to 100°C)
Pressure range

0 to 3000 psig (1 to 207 bar)
Materials• 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• Namur NE043 compliant• Submersible IP67/68

Digital interfaces

Transducer cables• 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) andtransducers comply with PED 97/23/EC for DN<25

Clamp-on ultrasonic flow transducers
Temperature ranges• Standard: -40°F to 302°F (-40°C to 150°C)• 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 otheroperations with a PC.

• Optional: -328°F to 752°F (-200°C to 400°C)
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: submersible IP67/68

Copyright 2020 Baker Hughes Company. All rights reserved.
BHCS38686 (12/2020)

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