DigitalFlow GS868 - Steam Mass Ultrasonic Flow Meter

Digital Meter Flow GS868 - Steam Mass Ultrasonic Flow Meter


The DigitalFlow™ GS868 and XGS868i ultrasonic steam flow meters solve the problems of pressure drop and rangeability found in other flow meters by reducing operation, installation and maintenance costs. Our line of steam flow meters are full-featured meter that measure mass flow rate of saturated and superheated steam over a very wide range of pipe sizes and flow conditions.

When measuring steam flow rate, pressure drop caused by orifice or vortex shedding meters robs energy from the steam, reducing the amount of power and heat delivered to the user. Using the GS868 or XGS868i with two ultrasonic transducers that do not protrude into the flow stream, transducer installation is obstructionless, causing no pressure drop and reducing steam generation costs. No regular maintenance is required with the new flow meters, further reducing long-term cost of ownership. Their titanium transducers have an all-metal boundary and are not affected by erosion from droplets. They will not fail due to thermal expansion cycles.

A single GS868 ultrasonic flow meter can cover a wide range of flows, giving additional savings. Because of their limited turndown ratios, conventional meters are used in multiple runs to cover all steam flow rates during high and low demand periods. Using a single GS868 flow meter to cover the full range can result in lower capital and installation costs.

DigitalFlow GS868 Features

  • Steam mass flow
  • Saturated or superheated steam
  • 1500:1 turndown ratio
  • Temperature up to 842 °F (450 °C) with BWT transducers
  • Pipes from 2 to 48 in (5.1 cm to 1.2 m)
  • Pressures from 0 to 1,500 psig

The DigitalFlow GS868 steam ultrasonic fl owmeter is a complete ultrasonic fl ow metering system that measures saturated or superheated steam for:

  • Heating, ventilating and air conditioning (HVAC)
  • Pneumatic power systems
  • Food and beverage industry
  • Water purifi cation and distillation
  • Chemical and petrochemical industries
  • Electric power generation
  • Steel industry
  • Public works
  • Manufacturing
Fluid Types Saturated and superheated steam
Pipe Sizes 2 in to 48 in NB (50 mm to 1200 mm DN)
Pipe Materials All metals. Consult GE for other materials.
Flow Accuracy (Velocity) ±1% to 2% of reading typical
Accuracy 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.
Repeatability ±0.2% to 0.5% of reading
Range (Bidirectional) –150 to 150 ft/s (–46 to 46 m/s)
Rangeability (Overall) 1500:1
Specifications assume a fully developed fl ow profi le (typically 20 diameters upstream and 10 diameters downstream of straight pipe run) and fl ow velocity greater than 3 ft/s (1 m/s).
Measurement Parameters Mass fl ow, standard and actual volumetric fl ow, totalized fl ow, and fl ow velocity


Flow Measurement Patented Correlation Transit-Time mode
  • Standard: Epoxy-coated aluminum weatherproof Type 4X/IP66, FM/CSA Class I, Division 2, Groups A,B,C&D
  • Optional: Stainless steel, fi berglass, explosion-proof, fl ameproof, ISSep 03ATEX113
Dimensions Standard: Weight 11 lb (5 kg),
size (h x w x d) 14.24 in x 11.4 in x 5.12 in (362 mm x 290 mm x 130 mm)
  • Standard: One channel
  • Optional: Two channels (for two pipes or two-paths)
Display Two independent software-confi gurable 64 x 128 pixel backlit LCD graphic displays
Keypad 39-key tactile-feedback membrane keypad
Power Supplies
  • Standard: 100 to 130 VAC, 50/60 Hz or 200 to 265 VAC, 50/60 Hz
  • Optional: 12 to 28 VDC, ±5%
Power Consumption 20 W maximum
Operating Temperature –4°F to 131°F (–20°C to 55°C)
Storage Temperature –67°F to 167°F (–55°C to 75°C)
Standard Inputs/Outputs Two 0/4 to 20 mA isolated outputs, 550Ω maximum load
Optional Inputs/Outputs There are six additional slots available for any combination of the following I/O boards:
  • Analog outputs: each with four isolated 0/4 to 20 mA outputs, 1 kΩ maximum load
  • Analog input board with two isolated 4 to 20 mA inputs and 24 V loop power
  • RTD input board with two isolated, three-wire, RTD inputs; span –148°F to 662°F (–100°C to 350°C); 100Ω
  • Totalizer/frequency outputs: – Totalizer mode: Pulse per defi ned unit of parameter – Frequency mode: Pulse frequency proportional to magnitude of parameter (e.g., 10 Hz = 1 ft3/h) • Alarm relays: – General purpose – Hermetically sealed
Digital Interfaces
  • Standard: RS232
  • Optional: RS485 (multiuser)
  • Optional: Modbus® RS485 or TCP protocol
  • Optional: Ethernet
  • Optional: OPC server
  • Optional: Foundation fieldbus
Site Parameter Programming Menu-driven operator interface using keypad and “soft” function keys
Data Logging Memory capacity (linear and/or circular type) to log over 43,000 fl ow data points
Display Functions
  • Graphic display shows fl ow in numerical or graphic format
  • Displays logged data and diagnostics
European Compliance Complies with EMC Directive 89/336/EEC, 73/23/EEC LVD (Installation Category II, Pollution Degree 2) and PED 97/23/EC for DN<25 Wetted Ultrasonic Flow Transducers Temperature Ranges Overall range –190° to 450°C (–310° to 842°F)
Pressure Ranges
  • Standard: 0 to 2700 psig (1 to 187 bar)
  • Optional: 3480 psig (240 bar) maximum
Transducer Materials Standard: Titanium or stainless steel
Transducer Mounting Flanged port: spool piece or cold tap
Area Classifi cations
  • Standard: Weatherproof Type 4/IP65
  • Optional: Explosion-proof Class I, Division 1, Groups C&D
  • Optional: Flameproof II 2 G EEx d IIC T6

Additional Options

PanaView PC-Interface Software The DigitalFlow GS868 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.

Descriptions English Italiano Português Español
DigitalFlow™ GS868 Medidor ultrassônico de vazão mássica para vapor da Panametrics DigitalFlow™ GS868 Medidor ultrassônico de vazão mássica para vapor da Panametrics DigitalFlow™ GS868 Medidor ultrassônico de vazão mássica para vapor da Panametrics
DigitalFlow™ XGS868 Transmissor ultrassônico de vazão para vapores da Panametrics DigitalFlow™ XGS868 Transmissor ultrassônico de vazão para vapores da Panametrics
GS868 1-CH Programming GS868 1-CH Programming
GS868 2-CH Programming GS868 2-CH Programming
GS868 Brochure GS868 Brochure GS868 Brochure
GS868 Quick Start GS868 Quick Start
GS868 Service Operating Manual GS868 Service Operating Manual
User's Guide User\'s Guide
XGS868i Brochure XGS868i Brochure XGS868i Brochure XGS868i Brochure
XGS868i Startup Guide XGS868i Startup Guide