DigitalFlow™
XGS868i
Panametrics SteamFlow UltrasonicTransmitter

Applications

Features

The DigitalFlow XGS868i steam flow transmitteris a complete ultrasonic flow metering system
for measurement of:• Economical flow measurement in a compact transmitter• Saturated steam• Superheated steam

The DigitalFlow XGS868i is designed to measure
the mass flow rate of saturated or superheatedsteam. The DigitalFlow XGS868i offers a unique
combination of rangeability, ease of installation,
low maintenance and accuracy in a low-costtransmitter.
The state-of-the-art DigitalFlow XGS868i steam
flow transmitter shares the many advantages
offered by the other products in GE’s line ofinnovative ultrasonic flowmeters. The all-digital
XGS868i creates no pressure drop; has nomoving parts or parts that foul or collect debris;
seldom requires maintenance; and provides
reliable, drift-free operation.

Panametrics.com• No moving parts• No pressure drop
• Wide rangeability with 1500 to 1 turndown ratio• Non-obstructive flow measurement• Tolerance to dirty streams• Low maintenance• Suitable for high temperatures• Two-path measurement available for maximum
accuracyCompact HousingAll of the DigitalFlow XGS868i’s electronic components
are housed in a compact transmitter package that canbe installed right at the flow measurement point. This
greatly simplifies wiring of the transducers and results introuble-free operation.

Steam Mass Flow Rate

The measured flow velocity rate, along with the inputof temperature and pressure, allow the powerfulonboard computer to calculate the steam mass flow
rate. The mass flow rate can be displayed locally, ortransmitted to a remote system via an analog or digitalcommunications link.

Dual-Channel Model

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
different pipes.

Low Operational Costs

Because a DigitalFlow XGS868i installation produces noflow obstruction, the energy-robbing pressure drops andhigh maintenance requirements characteristic of otherflowmeters are eliminated. The special sealed metaltransducers supplied with a DigitalFlow XGS868i system
are immune to the erosion and stress caused by thermal
expansion cycles.

Additional OptionsPanaView PC Interface Software
The DigitalFlow XGS868i communicates with a PC
through a serial interface and Windows® operating
systems. Consult the manual for details on sites, logs andother operations with a PC.

XGS868i Specifications
Operation and Performance
Fluid Types
Saturated or superheated steam

Channels•Standard: One channel•

Optional: Two channels (for two pipes or two-pathaveraging)

Display

2 in to 48 in (50 mm to 1200 mm) nominal bore (NB)

Optional: 2 line x 16 character backlit LCD display,configurable to display up to four measurement
parameters in sequence

Pipe MaterialsKeypadAll metals. Consult GE for other materials.

Built-in infrared, six-button keypad for full functionality
operation

Pipe Sizes

Flow Accuracy (Velocity)±1% to 2% of reading typicalAccuracy depends on pipe size and whether measurement
is one-path or two-path. Accuracy to ±0.5% of reading may
be achievable with process calibration.

­Power Supplies•

Standard 100-240 VAC ±10%•

Optional: 12 to 28 VDC, ±5%

Repeatability

Note: For DC-powered meters, Class 2 rated supplies must
be used for the line power±0.2% to 0.5% of reading

Power Consumption

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 of straight pipe run) and flow velocity greaterthan 3 ft/s (1 m/s).

Measurement Parameters
Mass flow, standard and actual flow, totalized flow, andflow velocity.

20 W 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 W maximum load
Namur NE043 compliant

Optional Inputs/Outputs
All analog and digital I/O are available in specificcombinations. Consult GE for available option cards.

Electronics•Flow Measurement•

Two 4 to 20 mA isolated inputs, 24 VDC loop power•

Two or four isolated, three-wire RTD (temperature)

Transit time

inputs, –148°F to 662°F (–100°C to 350°C), 100 W

Enclosures•

Standard: Epoxy-coated aluminum Type 4X
IP66 Class I, Division 1, Groups B,C,D Flameproofplatinum••

Optional: Stainless steelDimensions (h x d)Standard: Size 8.2 in x 6.6 in (208 mm x 168 mm),weight 10 lb (4.5 kg)

Two or four pulse or frequency outputs, opticallyisolated, 3 A maximum, 100 VDC maximum, 1 W

ISSeP02ATEX008
II 2 GD EEx d IIC T5 IP66 T95°C

Two additional 0/4 to 20 mA isolated outputs, 1,000 Smaximum loadmaximum, from DC to 10 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 InterfacesMaterials•

Standard: RS232•

Standard: Titanium•

Optional: RS485 (multiuser)•

Optional: Monel® or Hastelloy® alloys•

Optional: HART® protocol•

Optional: Modbus® protocol

Process Connections

Data Logging•

Standard: None•

Optional: Memory capacity (linear and/or circulartype)to log over 150,000 flow data points

European Compliance
System complies with EMC Directive 2004/108/EC,2006/95/EC, LVD (Installation Category II, Pollution
Degree 2) and transducers comply with PED 97/23/EC for
DN<25Preamplifier•

In-line preamplifier for long cable lengths orattenuating installations•Operating temperature: -40°F to 140°F (-40°C to60°C)

Wetted Ultrasonic Flow Transducers
Temperature Range•

Standard: –58°F to 302°F (–50C° to 150°C)•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

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920-002G

Flanged and compression fittings

Mountings
Flowcell or cold tap

Area Classifications•Standard: General purpose•

Optional: Weatherproof Type 4X IP65

•Optional: Explosion-proof Class I, Division 1, GroupsC,D•

Optional: Flameproof

II 2 GD EEx d IIC T6

Transducers and flowcells for specific applications areavailable. Consult GE for details.

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 HighPressure Ultrasonic FlowTransducers

Bundle Waveguide Technology™ (BWT) Systemtransducer and holder (see BWT System specifications)are available.