GE Infrastructure

Sensing

Applications
The XMT868 liquid flow transmitter is
a complete ultrasonic flow metering
system for measurement of:
• Hydrocarbon liquids
• Petroleum products
• Crude oil
• Lubricating oils
• Diesel fuel oils
• Solvents
• Water and wastewater
• Hot/chilled water
• Chemicals
• Beverages
• Other liquids

TM
Features DigitalFlow XMT868
• Economical nonintrusive flow Ultrasonic Liquid Flow Transmitter
measurement
The GE Infrastructure Sensing and never come into contact with the
• Hazardous area certification XMT868 DigitalFlow ultrasonic flow process fluid. Wetted transducers are
• Simple setup and installation transmitter combines state-of-the-art mounted into the pipe or flowcell in
flow measurement capability with a direct contact with the process fluid.
• Suitable for wide range of pipe low-cost trans-
sizes and materials mitter package that can be installed Clamp-on transducers offer maximum
right at the process measurement convenience, flexibility and a low
• Two-channel/two-path version installation cost compared to traditional
available point. The XMT868 carries appropriate
certification for classified installation in flow metering technologies. With proper
areas commonly found in petrochemical installation, wetted transducers provide
and chemical processing environments. maximum accuracy (better than 1 per-
cent of reading) in most applications.
The all-digital XMT868 has no moving
parts, requires minimal maintenance Dual-Channel Version Reduces
and provides long-term, drift-free Costs and Improves Performance
operation. An onboard microprocessor The optional dual-channel/dual-path
provides exclusive digital signal coding model can be user-configured for a
and correlation detection routines, variety of applications. It can be set up
automatic adjustment to changing to measure flow in two separate pipes
fluid properties, and dynamically con- with one meter to reduce the cost-per-
figured operating software to simplify measurement point.
programming.
To minimize the effects of flow profile
Wetted or Clamp-On Transducers distortions, flow swirl and cross flow,
Ultrasonic flow transducers are classi- and for maximum accuracy, you can
fied as either wetted or nonwetted install the two sets of transducers on
(clamp-on). Clamp-on transducers are the same pipe.
GE Panametrics has joined clamped onto the outside of the pipe
other GE high-technology
sensing businesses under
a new name —

GE Infrastructure
Sensing

© 2004 Panametrics, Inc. All rights reserved. GE Panametrics ❘ GE Thermometrics ❘ GE NovaSensor ❘ GE Druck ❘ GE Kaye ❘ GE General Eastern ❘ GE Ruska
920-041A Now under one name: GE Infrastructure Sensing
GE Infrastructure
Sensing

XMT868 Flow Transmitter

Uses Transit-Time Flow
Measurement Technique Variable Time Interval
In this method, two transducers serve
as both ultrasonic signal generators and
receivers. When mounted on a pipe, Transmit Receive
they are in acoustic communication Signal Signal
with each other, meaning the second Time
transducer can receive ultrasonic signals
transmitted by the first transducer and
vice versa. Tracking Window
Locked onto
In operation, each transducer functions Receive Signal
as a transmitter, generating a certain
number of acoustic pulses, and then Range of
as a receiver for an identical number Tracking Window
of pulses.
The time interval between transmission
ATW ensures accuracy when fluid conditions change.
and reception of the ultrasonic signals
is measured in both directions. When
the liquid in the pipe is not flowing, ATW works for both clamp-on and Clamp-On Flow Accuracy (Velocity)
the transit-time downstream equals wetted transducer applications by • Pipe ID>6 in. (150 mm):
the transit-time upstream. When the searching for a reliable ultrasonic receive ±1% to 2% of reading typical
liquid is flowing, the transit-time signal. It does this by varying the time
downstream is less than the transit- between the transmit signal and the • Pipe ID≤6 in. (150 mm):
time upstream. receive signal window until the receive ±2% to 5% of reading typical
signal is found. The tracking window Wetted Flow Accuracy (Velocity)
The difference between the down-
stream and upstream transit times is automatically sweeps through a range of ±1% of reading typical
proportional to the velocity of the time intervals based on the minimum Note: Accuracy depends on pipe size and
flowing liquid, and its sign indicates and maximum expected sound speeds whether measurement is one-path or two-
the direction of flow. programmed by the user. path. Accuracy to ±0.5% of reading may
The window moves (tracks) in response be achievable with process calibration.
to changes in the fluid sound speed. Repeatability
Flowmeter Transducers
Once the optimal signal is found, ATW
locks onto it until another large change ±0.1% to 0.3% of reading
in sound speed occurs. When this Range (Bidirectional)
happens, ATW returns to the seek mode –40 to 40 ft/s (–12.2 to 12.2 m/s)
Fluid
Flow until the optimal signal is found again.
Rangeability (Overall)
Specifications 400:1
Operation and Performance Note: Specifications assume a fully developed
Ultrasonic Signal Path flow profile (typically 10 diameters upstream
Fluid Types and 5 diameters downstream of straight pipe
Acoustically conductive fluids, including run) and flow velocity greater than
Transit-time flow measurement technique
most clean liquids, and many liquids with 1 ft/s (0.3 m/s).
entrained solids or gas bubbles. Maxi-
Automatically Adjusts to mum void fraction depends on trans- Measurement Parameters
Changing Fluid Properties ducer, interrogation carrier frequency, Volumetric flow, totalized flow and
path length and pipe configuration. flow velocity
Standard in all XMT868 transmitters,
our unique Automatic Tracking Pipe Sizes Electronics
Window™ (ATW™) feature ensures • Clamp-on transducers: 0.5 to 300 in. Flow Measurement
accurate flow measurements even (12.7 mm to 7.6 m) and larger
when fluid properties are unknown or Patented Correlation Transit-Time™
• Wetted transducers: 1 to 200 in. mode
changing. Like the seek mode on your (25.4 mm to 5 m) and larger
car stereo, ATW dynamically sweeps the Enclosures
receiver window whenever the sound Pipe Wall Thickness
• Standard: Epoxy-coated aluminum
speed of the fluid changes. This power- Up to 3 in. (76.2 mm) Weatherproof NEMA 4X IP66
ful feature lets you measure flow when Pipe Materials Class I, Div 1, Groups B,C,D
the fluid sound speed is unknown, is FM J.I.1B1A9.AE, CSA LR 44204-26
All metals and most plastics. Consult
changing due to large temperature Flameproof ISSeP02ATEX008
GE Infrastructure Sensing for con-
shifts, or when a new liquid starts to  II 2 GD EEx d IIC T5 IP66 T95°C
crete, composite materials, and highly
flow in a multiproduct pipeline.
corroded or lined pipes. • Optional: Stainless steel
Dimensions Data Logging Mountings
Standard: Weight 10 lb (4.5 kg), • Standard: None Flanged flowcell, hot tap or cold tap
size (h × d) 8.2 × 6.6 in. (208 × 168 mm) • Optional: Memory capacity (linear Area Classifications
Channels and/or circular type) to log up to • Standard: General purpose
• Standard: One channel 150,000 flow data points
• Optional: Weatherproof
• Optional: Two channels (for two European Compliance NEMA 4 IP65
pipes or two-path averaging) System complies with EMC Directive • Optional: Explosion-proof
Display 89/336/EEC, 73/23/EEC LVD Class I, Div 1, Groups C,D
(Installation Category II, Pollution
Optional: 2-line × 16-character backlit Degree 2) and transducers comply • Optional: Flameproof
LCD display, configurable to display with PED 97/23/EC for DN< 25  II 2 G EEx d IIC T6
up to four measurement parameters • Optional: Submersible
in sequence Clamp-On Ultrasonic Note: Transducers (wetted and clamp-on),
Power Supplies Flow Transducers flowcells and clamping fixtures for specific
• Standard: 100 to 130 VAC, 50/60 Hz Temperature Ranges applications are available. Consult GE
or 200 to 265 VAC, 50/60 Hz • Standard: Infrastructure Sensing for details.
• Optional: 12 to 28 VDC, ± 5% –40° to 60°C (–40° to 140°F)
Transducer Cables
Power Consumption • Optional (overall range):
• Standard: One pair of coaxial cables,
20-W maximum –190° to 300°C (–310° to 572°F)
type RG62 AU, or as specified for
Operating Temperature Mountings transducer type
–40 to 60°C (–40° to 140°F) Stainless steel chain or strap, welded • Optional: Lengths up to 1,000 ft
or magnetic clamping fixtures (330 m) maximum
Storage Temperature
Area Classifications
–55° to 75°C (–67° to 167°F) High-Temperature and High-Pressure
• Standard: General purpose Ultrasonic Flow Transducers
Standard Inputs/Outputs
• Optional: Weatherproof Bundle Waveguide Technology™
Two 0/4- to 20-mA isolated outputs, NEMA 4 IP65
600-Ω maximum load System transducer and holder (see
• Optional: Explosion-proof BWT™ System specifications)
Optional Inputs/Outputs Class I, Div 1, Groups C,D
All analog and digital I/O are available Energy Measurement
• Optional: Flameproof
in specific combinations. Consult GE  II 2 G EEx md IIC T6–T3 Energy Measurement
Infrastructure Sensing for available Calculates energy flow rate and totalized
option cards. • Optional: Submersible
energy. Requires optional RTD or
• Two additional 0/4- to 20-mA isolat- Wetted Ultrasonic analog I/O board.
ed outputs, 1,000-Ω maximum load Flow Transducers Temperature Transducers
• Two 4- to 20-mA isolated inputs, Temperature Ranges Loop-powered, three-wire, platinum
24-VDC loop power • Standard: –40° to 100°C RTDs; clamp-on and wetted (thermo-
• Two or four isolated, three-wire RTD (–40° to 212°F) well) types are available
(temperature) inputs, –100° to 350°C • Optional (overall range): Accuracy
(–148° to 662°F), 100-Ω platinum –190° to 600°C (–310° to 1112°F) ±0.15°C with wetted RTDs
• Two or four pulse or frequency out- Pressure Ranges (matched pairs)
puts, optically isolated, 3-A maximum,
100-VDC maximum, 1-W maximum, • Standard: 0 to 3,000 psig (1 to 207 bar) Range
from DC to 10-kHz maximum • Optional: Higher pressures on –20° to 260°C (–4° to 500°F)
• Alarm relays: request Note: The accuracy of the energy measure-
– General purpose: Materials ment is a combination of the accuracy of the
Two or four Form C relays; 120 VAC, • Standard: Stainless steel associated flow and temperature measure-
28-VDC maximum, 5-A maximum; ments. 1% to 2% of reading is typical for
• Optional (for Pan-Adapta® Plugs): calibrated systems. Not all extremes of
DC 30-W maximum, AC 60 VA Titanium, Hastelloy® alloy, Monel® parameters can be achieved simultaneously.
– Hermetically sealed: alloy, duplex, CPVC, PVDF and others
Two or four Form C relays; 120 VAC, Note: Pan-Adapta plugs allow installation Additional Options
28-VDC maximum, 2-A maximum; and removal of wetted transducers without PanaView™ PC-Interface Software
DC 56-W maximum, AC 60 VA interrupting the process or emptying the pipe. The XMT868 communicates with a PC
Digital Interfaces through a serial interface and Windows®
Process Connections
• Standard: RS232 operating systems. Consult the manual
• Standard: 1-in. or 3/8-in. NPTM
• Optional: RS485 (multiuser) for details on sites, logs and other
• Optional: RF flanged, socket weld, operations with a PC.
• Optional: HART® protocol fuse bond and others
• Optional: Modbus® protocol
GE Infrastructure
Sensing

T 800 833 9438 • 978 437 1000 All specifications are subject to change for product improvement without notice. Panametrics®, DigitalFlow™, Correlation Transit-Time™, Automatic Tracking
F 978 437 1031 Window™, ATW™, Pan-Adapta®, Bundle Waveguide Technology™, BWT™ and PanaView™ are trademarks or registered trademarks of Panametrics, Inc.
sensing@ge.com GE® is a registered trademark of General Electric Co. Windows® is a registered trademark of Microsoft Corporation, which is not affiliated with GE, in the
www.gesensing.com U.S. and other countries. Other company or product names mentioned in this document may be trademarks or registered trademarks of their respective
companies, which are not affiliated with GE.