DigitalFlow™
XGM868i

Panametrics Gas Flow
Ultrasonic Transmitter
Applications

Features

The DigitalFlow XGM868i gas ﬂow transmitter is a complete
ultrasonic ﬂow metering system for measurement of mostgases including:• Economical ﬂow measurement in a compact transmitter• Hydrocarbon gases• Vent gases• Biogases• Digester gases• Fuel gases• Waste gases• Incinerator air ﬂow• Vapor recovery• Stack gases• Other gases• No moving parts• No pressure drop
• Wide rangeability with 1500 to 1 turndown ratio• Non-obstructive ﬂ ow measurement• Tolerance to dirty streams• Low maintenance• Suitable for high temperatures• Two-path measurement available for maximum accuracy

Dual-channel model

The DigitalFlow XGM868i gas ultrasonic ﬂow transmitteris designed to measure the ﬂow rate of virtually any gas.
The DigitalFlow XGM868i ﬂow transmitter offers a unique
combination of rangeability, ease of installation, lowmaintenance and accuracy in a low-cost transmitter. The
state-of-the-art XGM868i shares the many advantages
offered by the other products in the Panametrics line ofinnovative ultrasonic ﬂowmeters. The all-digital XGM868i
creates no pressure drop; has no moving parts or parts thatfoul or collect debris; seldom requires maintenance; andprovides reliable, drift-free operation. The ﬂow rate can bedisplayed locally or transmitted to a remote system via ananalog or digital communications link.

In addition to the standard single-channel model, an
optional two-channel model provides enhanced accuracy
when measuring two paths on a single pipe. It can also be
used to measure a single path on two pipes.

Low operational costs
Because the DigitalFlow XGM868i installation produces
no ﬂow obstruction, the energy-robbing pressure drops
and high maintenance requirements characteristic ofother ﬂowmeters are eliminated. The special sealed metaltransducers supplied with a DigitalFlow XGM868i system
are immune to the erosion and stress caused by thermal
expansion cycles.

Compact housing
All of the DigitalFlow XGM868i’s electronic components arehoused in a compact transmitter package that can beinstalled right at the ﬂow measurement point. This greatly
simpliﬁes wiring of the transducers and results in trouble-freeoperation.

Tranducer TypeWorks under wide range of flow conditions
Unlike limited conventional ﬂowmeters, the DigitalFlow
XGM868i transmitter can be used over a wide range of ﬂ ow
rates with any gas at pressures up to 3,480 psig (240 bar).
Turndown ratio is 1500 to 1.

T5 Wetted Transducer

T17 Wetted Tranducer
Flow Measurement Range

Standard Range-150 to 150 ft/s (-50 to 50 m/s) - bidirectional
Applicable Pipe Sizes

Diagonal 45

3 in to 14 in (50 to 350 mm) OD

14 in to 120 in (350 to 3000 mm) OD

Note 1 & 2

Not Applicable

Bias 90

Design Velocity Accuracy from 1 to 150 ft/s (0.3 to 50 m/s)
Transducer TypeT5 Wetted Transducer

Number of Paths

T17 Wetted Tranducer

One Path

Two Paths

One Path

Two Paths

1 ft/s (0.3 m/s) >3 ft/s (1 m/s)

1 ft/s (0.3 m/s) >3 ft/s (1 m/s)

1 ft/s (0.3 m/s) >3 ft/s (1 m/s)

1 ft/s (0.3 m/s) >3 ft/s (1 m/s)

Pipe Dia. </= 6 in.
(150mm)+-2.5%+-2.0%+-2.0%+-1.5%NANANANA

Pipe Dia. >/= 6 in(150mm)+-2.0%+-2.0%+-1.5%+-1.5%+-2.0%+-2.0+-1.5%+-1.5%

Calibrated Velocity Accuracy from 1 to 150 ft/s (0.3 to 50 m/s) - see notes below
Transducer TypeT5 Wetted Transducer
1 ft/s (0.3 m/s) >3 ft/s (1 m/s)

T17 Wetted Tranducer

1 ft/s (0.3 m/s) >3 ft/s (1 m/s)

1 ft/s (0.3 m/s) >3 ft/s (1 m/s)

1 ft/s (0.3 m/s) >3 ft/s (1 m/s)

Pipe Dia. </= 6 in.
(150mm)+-1.5%+-1.0%+-1.0%+-0.75%

NANANANA

Pipe Dia. >/= 6 in(150mm)+-1.0%+-1.0%+-0.75%+-0.75%+-1.0%+-1.0%+-0.75%+-0.75%

Flow Velocity Sensitivity from .1 to 1 ft/s (0.03 to .3 m/s)
Pipe Dia. = 10 in.
(250mm)±0.12 in/s(±0.004 m/s)

±0.08 in/s( ±0.003 m/s)

NANA

Pipe Dia. = 14 in.
(250mm)±0.12 in/s(±0.004 m/s)

±0.08 in/s( ±0.003 m/s)

±0.08 in/s(±0.003 m/s)

±0.06 in/s( ±0.002 m/s)

Pipe Dia. >/= 20in. (500mm)±0.12 in/s(±0.004 m/s)

±0.08 in/s( ±0.003 m/s)

±0.06 in/s( ±0.002 m/s)

±0.04 in/s(±0.0015 m/s)

Note 1 Accuracy and sensitivity are dependent on pipe diameter, molecular weight and temperature. All accuracy specs assume molecular weights
greater than 24 kg/kmole and temperatures less than 100 °F (38 °C)
Note 2 Accuracy is dependent on straight run. All accuracy specs assume a fully developed ﬂow proﬁle or a minimum straight run of 20D upstream and10D downstream
Note 3 Stated accuracy may be achieved with total straight run as little as 10D using ﬂow proﬁle correction - contact factory for details

Specifications
Operation and performance
Fluid Types
Acoustically conductive gases
Pipe Sizes
2 to 120 in. NB (50 to 3,000 mm) and larger
Pipe Materials
All metals. Consult Panametrics for other materials.
Flow Accuracy (Velocity)+-1.5% Typical two path meter+-2.0% Typical one path meter
Accuracy depends on pipe size and whether measurement is
one-path or two-path. Accuracy to ±0.5% of reading may beachievable with process calibration.
Repeatability±0.2% to 0.5% of reading
Range (Bidirectional)–150 ft/s to 150 ft/s (–46 m/s to 46 m/s)
Rangeability (Overall)
1500:1
Speciﬁcations assume a fully developed ﬂow proﬁle (typically
20 diameters upstream and 10 diameters downstream ofstraight pipe run) and ﬂow velocity greater than 3 ft/s (1m/s).
Measurement Parameters
Mass ﬂow, standard and actual ﬂow, totalized ﬂow, and ﬂow
velocity

Electronics
Flow Measurement
Transit time
Enclosures• Standard: Epoxy-coated aluminum Type 4X/IP66 Class I,
Division 1, Groups B,C&D
Flameproof ISSeP 02ATEX008
II 2 GD EEx d IIC T5 IP66 T95°C• Optional: Stainless steel
Dimensions (h x d)Standard: Size 8.2 in x 6.6 in (208 mm x 168 mm), weight 10 lb(4.5 kg)
Channels• Standard: One channel• Optional: Two channels (for two pipes or two-pathaveraging)

Display
Optional: 2 line x 16 character backlit LCD display,
conﬁgurable to display up to four measurement parameters
in sequence
KeypadBuilt-in 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 beused for the line power
Power Consumption
20 W maximum
Operating Temperature–40°F to 140°F (–40°C to 60°C)
Storage Temperature–67F° to 167°F (–55°C to 75°C)
Standard Inputs/Outputs
Two 0/4 to 20 mA isolated outputs, 600 Ω maximum load
Namur NE043 compliant
Optional Inputs/Outputs
All analog and digital I/O are available in speciﬁccombinations. Consult Panametrics for available option
cards.
• Two additional 0/4 to 20 mA isolated outputs, 1000 Ωmaximum 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 Ω platinum• Two or four pulse or frequency outputs, optically isolated, 3A maximum, 100 VDC maximum, 1 W maximum, from DC to10 KHz maximum• Alarm relays:– Two or four Form C relays; 120 VAC, 28 VDC maximum,
5 A maximum; DC 30 W maximum, AC 60 VA maximum

Digital Interfaces

Materials• Standard: RS232• Standard: Titanium• Optional: RS485 (multiuser)• Optional: Monel® or Hastelloy® alloys• Optional: Modbus® RS485 or TCP protocol

Process Connections
Flanged and compression ﬁttings• Optional: Ethernet• Optional: OPC server• Optional: Foundation Fieldbus®
Data Logging• Standard: None
• Optional: Memory capacity (linear and/or circular type) tolog over 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) andtransducers comply with PED 97/23/EC for DN<25

Wetted Ultrasonic Flow Transducers

Mountings
Flowcell or cold tap
Area Classiﬁcations• Standard: General purpose• Optional: Weatherproof Type 4X/IP66• Optional: Explosion-proof Class I, Division 1, Groups B,C,&D• Optional: Flameproof

II 2 GD EEx d IIC T6Transducers and ﬂowcells for speciﬁc applications areavailable. Consult Panametrics for details.

Transducer cables

Temperature Range• Standard: One pair of coaxial cables, type RG62 AU, or as
speciﬁed for transducer type

• Standard: –58°F to 302°F (–50C° to 150°C)• Optional: Lengths up to 1000 ft (330 m) maximum• Optional (overall): –310°F to 842°F (–190°C to 450°C)
Pressure Range• Standard: 0 psig to 2700 psig (1 bar to 187 bar)
• Optional: 3480 psig (240 bar) maximum

Copyright 2023 Baker Hughes Company. All rights reserved.
BHCS38643 (04/2023)

High-temperature and high-pressure ultrasonicflow transducers
Bundle Waveguide Technology™ (BWT) System transducer
and holder (see BWT System speciﬁcations) are available.

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