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Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter

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AT868-XXX
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The Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter is a transmitter package capable of measuring flow within pipes. It is available in single- and dual-channel models. Dual-channel models enable the Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter to measure flow in two pipes or increase measurement accuracy by averaging two paths on the same pipe.

This ultrasonic flow meter has been optimised for measuring the flow of water, wastewater, sewage, discharge water, treated water, and cooling and heating water, as well as other liquids in full pipes. This makes the Druck AquaTrans™AT868 Ultrasonic Liquid Flow Meter particularly useful for municipal applications and can be used to optimise energy efficiency and thereby reduce energy costs by measuring chilled water/ cooling systems.

The Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter can be installed at the process measurement point and may be configured using the internal keypad or via connection to a laptop or PC with BHGE’s instrument software installed, thereby simplifying programming. Furthermore, the Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter will automatically adjust to accommodate changing fluid properties. It is entirely digital and, as such, does not feature any moving parts, minimising its maintenance requirements.

This instrument can be used with clamp-on transducers or wetted transducers, allowing the user to tailor the Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter to the application. Non-invasive, clamp-on (non-wetted) transducers are convenient, flexible, easy-to-install and less expensive to install: they are clamped on to the outside of the pipe and do not come into contact with the fluid. However, clamp-on transducers do not provide the same level of accuracy as wetted transducers. When the Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter is used with clamp-on transducers it has an accuracy of 1-2% of the reading.

Wetted transducers provide an accuracy better than 1% of the reading. However, they are less convenient, cost-effective and flexible than clamp-on transducers as they are mounted into the pipe or flowcell, allowing it to come into direct contact with the liquid.

As the Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter is able to offer a non-intrusive, obstruction-less method of measurement, it eradicates the possibility of pressure drops and contamination. It is suitable for use with a wide range of pipes of various sizes and materials, including lined pipes.

Utilising an onboard microprocessor with correlation TransitTime™ technology optimised for long-term, drift-free operation, the user can measure flow velocity, volumetric and totalised flow. Transit-Time Flow Measurement utilises the following method to determine the necessary readings:

  1. A pair of transducers sends and receives coded ultrasonic signals through the fluid.
  2. When the signal transit-time in the downstream direction is shorter than the upstream direction the difference between these times is proportional to the flow velocity.
  3. Using this time difference and the programmed pipe parameters, the flow meter is able to determine the flow rate and direction.

The Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter has a liquid flow range of 0.1 to 40 ft/s (0.03 to 12.2 m/s) and a turndown ratio of 400:1. It is also equipped with one analogue output and one frequency/ pulse totalizer output as standard.

The Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter is an economical, easy-to-use, adaptable and versatile liquid flow meter suitable for measuring a variety of liquids and pipes. It can be used for a multitude of purposes including optimising energy use and reducing energy costs.

GE Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter Key Features

  • Transmitter package capable of measuring flow within pipes
  • Available in single- and dual-channel models
  • Dual-channel models can be used to measure flow in two pipes
  • Dual-channel models can be used to increase measurement accuracy by averaging two paths on the same pipe
  • Measure the flow of water, wastewater, sewage, discharge water, treated water, and heating and cooling water, as well as other liquids
  • Measure full pipes
  • Useful for municipal applications
  • Can be used to optimise energy efficiency and reduce energy costs by measuring chilled water/ cooling systems
  • Can be installed at the process measuring point
  • Can be configured using the keypad
  • Can be configured via a connection to a laptop or PC with BHGE’s instrument software installed
  • Both methods of configuration simplify programming
  • Entirely digital
  • No moving parts reducing the need for maintenance
  • Automatically adjusts to accommodate changing fluid properties
  • Can be used with clamp-on transducers
  • Clamp-on transducers are convenient, easy- and economical-to-install, and versatile
  • Clamp-on (non-wetted) transducers are placed on the outside of the pipe and do not come into contact with the fluid
  • Clamp-on transducers have an accuracy of 1-2% of the reading
  • Wetted transducers provide a better accuracy: less than 1% of the reading
  • Wetted transducers are mounted in the pipe or flowcell and do come into contact with the fluid
  • Wetted transducers are more accurate but less convenient, cost-effective and flexible than clamp-on transducers
  • Capable of non-intrusive, obstruction-less methods of measurement eradicating the possibility of pressure drops and contamination
  • Suitable for a range of pipes of various sizes and materials
  • Suitable for measuring lined pipes
  • Onboard microprocessor with correlation TransitTime™ technology optimised for long-term, drift-free operation
  • Measure flow velocity, volumetric and totalised flow
  • Transit-Time Flow Measurement uses a pair of transducers to send and receive coded ultrasonic signals through the fluid  
  • When the signal transit-time in the downstream direction is shorter than the upstream direction the difference between these times is proportional to the flow velocity
  • Using this time difference and the programmed pipe parameters the flow meter is able to determine the flow rate and direction
  • Liquid flow range: 0.1 to 40 ft/s (0.03 to 12.2 m/s)
  • Turn down ratio: 400:1
  • Equipped with one analogue output and one frequency/ pulse totalizer output as standard
  • Economical, easy-to-use, adaptable and versatile liquid flow meter
  • Suitable for measuring a variety of liquids and pipes
  • Can be used for a variety of purposes including optimising energy use and reducing energy costs

What’s Included?

  • GE Druck AquaTrans™ AT868 Ultrasonic Liquid Flow Meter (Choice of Single- or Dual-Channel)
Part CodeAT868-XXX

GE Druck AquaTrans AT868 Ultrasonic Liquid Flow Meter Technical Specifications 

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).
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 the 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 the measurement is one-path or two paths.
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
Measurement Parameters Volumetric flow, totalized flow and flow velocity
Electronics
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)
Channels 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 Ω 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
Namur NE043 compliant
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°F to 302°F (-40°C to 150°C)
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
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)
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
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.

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