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Druck DigitalFlow XMT868i Liquid Flow Transmitter

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XMT868I-XXX
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The Druck DigitalFlow XMT868i Liquid Flow Transmitter utilises ultrasonic technology to measure the flow of a variety of liquids including:

  • Hydrocarbons
  • Liquefied natural gas (LNG)
  • Crude oil
  • Lubricating oils
  • Diesel fuel oils
  • Solvents
  • Water and wastewater
  • Hot/chilled water
  • Chemicals
  • Beverages

This instrument can be installed at the process measurement point. It does not feature any moving parts and so requires minimal maintenance. It can be used reliably over long periods of time to provide drift-free measurements.

The Druck DigitalFlow XMT868i Liquid Flow Transmitter is available as a one- or two-channel version. The dual-channel version is particularly useful for measuring the flow in two separate pipes; it is an economic tool as it reduces the cost of each measurement point.

Alternatively, the dual-channel Druck DigitalFlow XMT868i Liquid Flow Transmitter may be used on a single pipe in order to reduce the effects of flow profile distortion, flow swirl and crossflow, thereby improving measurement accuracy. This is made possible as both sets of the dual-channel model’s transducers are installed on the same pipe.

The Druck DigitalFlow XMT868i Liquid Flow Transmitter can be used with wetted or clamp-on transducers. Clamp-on transducers offer increased flexibility and convenience as they are clamped onto the outside of the pipe ensuring that they are both easy to install and cost-effective. However, as these transducers do not make contact with the fluid in the pipe, they do not offer as great an accuracy as wetted transducers which are installed into the pipe.

Wetted transducers are mounted into the pipe or flowcell and so come into direct contact with the fluid. As a result, they are able to offer an accuracy that is better than 0.5% of the reading.

Please note that the Druck DigitalFlow XMT868i Liquid Flow Transmitter can also be used as part of wetted solutions such as a PanaFlow™ system. It can be mounted directly on top of the PanaFlow™ system and is shipped ready for installation.

Regardless as to which style of transducers are used, the Druck DigitalFlow XMT868i Liquid Flow Transmitter utilises a transit-time flow measurement technique to determine flow velocity and direction.

Each of the transducers acts as a sender and receiver of the same number of ultrasonic pulses. The Druck DigitalFlow XMT868i Liquid Flow Transmitter measures the length of time between these pulses being emitted by one transducer and received by the other transducer and vice versa. If the fluid is stagnant, the upstream and downstream transit times are equal. However, when the liquid is flowing the transit-time downstream will be less than the transit-time upstream. The difference between the transit times is proportional to the velocity of the liquid and the sign of this value will indicate the direction of flow.

The accuracy of the Druck DigitalFlow XMT868i Liquid Flow Transmitter is maintained despite unknown or changing fluid properties. This is due to the inclusion of an Automatic Tracking Window™ (ATW™) function which will alter the time between the transit-signal and receive-signal windows until a receive-signal is detected.

The ATW™ function sweeps through a number of intervals that are based on the minimum and maximum expected sound speeds entered into the Druck DigitalFlow XMT868i Liquid Flow Transmitter by the user (Seek mode). When an optimal receive signal is detected, the Druck DigitalFlow XMT868i Liquid Flow Transmitter will lock onto it until another significant change in sound speed is identified. When a significant change in sound speed occurs, the Druck DigitalFlow XMT868i Liquid Flow Transmitter will return to Seek mode and so will sweep through the receiver window times until another optimal ultrasonic signal is detected.

The ATW™ function is particularly useful when conducting flow measurements of fluids with unknown sound speeds, when the sound speed of the liquid is changing due to large temperature shifts, or when measuring the flow of a multiproduct pipeline.

The Druck DigitalFlow XMT868i Liquid Flow Transmitter’s ATM™ function is facilitated by its microprocessor which automatically adjusts the unit to accommodate for changing fluid properties. This microprocessor also provides the Druck DigitalFlow XMT868i Liquid Flow Transmitter with exclusive signal coding, correlation detection routines and a simple, dynamically-configured operating software.

The Druck DigitalFlow XMT868i Liquid Flow Transmitter features an infrared six-button keypad. As these buttons are sensitive to the user’s touch, he/she need only touch the Druck DigitalFlow XMT868i Liquid Flow Transmitter’s glass in order to operate the unit. This means that the user does not need to open the case or use a PC or handheld programmer to configure the Druck DigitalFlow XMT868i Liquid Flow Transmitter; this infrared keypad enables safe programming and diagnostic verification in hazardous locations.

Additionally, the Druck DigitalFlow XMT868i Liquid Flow Transmitter is also certified for use in hazardous (classified) locations such as those found in petrochemical and chemical processing environments.

However, if the user should prefer to operate the Druck DigitalFlow XMT868i Liquid Flow Transmitter via a PC interface it can be connected to a PC via the RS232 interface and may be programmed using the PanaView™ software (OPTIONAL). Use with the PanaView™ software also enables continuous data logging.

The Druck DigitalFlow XMT868i Liquid Flow Transmitter is an accurate, dependable, dynamic ultrasonic liquid flow meter suitable for measuring the velocity and direction of flow in pipes of various sizes and materials. This instrument is suitable for use in hazardous (classified) locations such as petrochemical and chemical processing environments.

 GE Druck DigitalFlow XMT868i Liquid Flow Transmitter Key Features

  • Utilises ultrasonic technology to measure the flow of a variety of liquids
  • Suitable for use with liquid hydrocarbons, LNG, crude oil, lubricating oil, diesel fuel oil, solvents, water and wastewater, hot/chilled water, liquid chemicals, and beverages
  • Does not feature any moving parts
  • Requires minimal maintenance
  • Can be used reliably over long periods of time to determine drift-free measurements
  • Available as one- and two-channel models
  • Can be installed at the process measurement point
  • Dual-channel versions are economic as they can be used to measure the flow in two pipes simultaneously
  • Dual-channel versions can be used on one pipe to increase accuracy by reducing the effect of flow profile distortion, flow swirl and cross flow
  • Can be used with either clamp-on or wetted transducers
  • Clamp-on transducers are attached to the outside of the pipe
  • Clamp-on transducers are easier to install and more cost-effective
  • Clamp-on transducers do not make contact with the fluid
  • Wetted transducers are more accurate than clamp-on transducers
  • Wetted transducers have an accuracy of better than 0.5% of the reading
  • Wetted transducers do make contact with the liquid as they are installed inside the pipe or flowcell
  • Can be used as part of wetted solutions such as a PanaFlow™ system
  • Can be mounted directly on top of a PanaFlow™ system
  • Supplied ready to install into a PanaFlow™ system
  • Utilises a transit-time measurement technique to determine flow velocity and direction
  • Automatic Tracking Window™ (ATW™) function maintains accuracy despite changing fluid properties
  • ATW™ function alters the time between the transit-signal and receive-signal windows until a receive-signal is detected
  • ATW™ sweeps through a number of time intervals which are based on the minimum and maximum expected sound speeds entered by the user (Seek mode)
  • When an optimal ultrasonic receive signal is detected the transmitter will lock onto it
  • If a significant change in sound speed is detected the ATW™ function will place the transmitter in Seek mode
  • ATW™ is useful when conducting flow measurements for fluids with unknown sound speeds, when large temperature shifts are causing changes in sound speed, or when measuring the flow of a multiproduct pipeline
  • The microprocessor automatically adjusts the transmitter to accommodate for changing fluid properties
  • The microprocessor provides exclusive signal coding, correlation detection routines, and a simple, dynamically-configured operating software
  • Features an infrared six-button keypad that is sensitive to the user’s touch
  • Press the glass to operate the unit
  • No need to open the glass, use a PC or handheld programmer to configure the unit
  • Infrared keypad facilitates safe programming and diagnostic verification in hazardous locations
  • Certified for use in hazardous (classified) locations such as those found in petrochemical and chemical processing environments
  • Can be operated via a PC interface
  • Connect to a PC using an RS232 interface and program using PanaView™ software
  • PanaView™ software enables continuous data logging
  • An accurate, dependable, dynamic ultrasonic liquid flow meter
  • Measure the velocity and direction of flow of liquids in pipes of various sizes and materials

What’s Included?

  • GE Druck DigitalFlow XMT868i Liquid Flow Transmitter (Configured to Your Specification)
Part CodeXMT868I-XXX

GE Druck DigitalFlow XMT868i Liquid Flow Transmitter Technical 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 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
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 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)
Channels 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 operation
Power Supplies Standard: 100-240 VAC ±10%
Optional: 12 to 28 VDC, ± 5%
Note: For DC-powered meters, Class 2 rated supplies must be used for the line power
Power Consumption 20W maximum
Operating Temperature -40°F to 140°F (-40°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 Namur NE043 compliant
Optional Inputs/Outputs All analogue 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 W 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 Interface  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°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 4X/IP66
Optional: Explosion Proof, Class I, Division 1, Groups B, C & D; Class II, Groups E, F & G; Class III
Optional: Flameproof II 2 G EEx md IIC T6–T3
Optional: Submersible (IP68)
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
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.
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 psig to 3000 psig (1 bar to 207 bar)
Optional: Higher pressures on request
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
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 Bundle Waveguide Technology™ System transducer and holder (see BWT™ System specifications)
Clamp-on extended temperature (C-ET) range transducer system
Energy Measurement
Description 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)
Note  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.
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