DigitalFlow™ GM868 Datasheet
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Panametrics general-purpose gas ultrasonic flowmeter Applications The DigitalFlow GM868 flow transmitter is a complete ultrasonic flow metering system for measurement of most gases including: • Full-featured flowmeter package • Hydrocarbon gases • Vent gases • Biogases • Digester gases • Fuel gases • Waste gases • Incinerator air flow • Vapor recovery • Stack gases • Other gases • Transducer removable under line pressure • 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 mea

Panametrics ultrasonic general purpose gas flowmeter The DigitalFlow GM868 flowmeter uses the patented Correlation Transit-Time™ method of ultrasonic flow measurement to provide accurate, drift-free measurements, without impeding or obstructing the flowt. Wide range of pipe sizes and flow conditions With its broad range of measurement velocities, and its ability to measure flow in any pipe from small to very large, one DigitalFlow GM868 meter does the job of several conventional meters. It handles pipes from 1 to 120 inches in diameter (2.5 cm to 3 m), and velocities from 0.1 to 150 ft/s...

Transducer type T17 wetted transducer Flow measurement range Standard range -150 to 150 ft/s (-50 to 50 m/s) - bidirectional Applicable pipe sizes Design velocity accuracy from 1 to 150 ft/s (0.3 to 50 m/s) Transducer type Number of Paths T5 wetted transducer One path Calibrated velocity accuracy from 1 to 150 ft/s (0.3 to 50 m/s) — see notes below Transducer type Number of paths T5 Wetted Transducer One path Flow velocity sensitivity from .1 to 1 ft/s (0.03 to .3 m/s) Pipe dia. = 10 in. (250 mm) Note 1 Accuracy and sensitivity are dependent on pipe diameter, molecular weight and...

GM868 specifications Operation and performance Fluid types All acoustically conductive gases Pipe sizes 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. Optional: 2 line x 16 character backlit LCD display, configurable to display up to four measurement parameters in sequence Built-in infrared, six-button keypad for full functionality operation Power supplies • Standard: 100-240...

Digital interfaces Area classifications Data logging Transducers and flowcells for specific applications are available. Consult Panametrics for details. Standard: RS232 Optional: RS485 (multiuser) Optional: Modbus® RS485 or TCP protocol Optional: Ethernet Optional: OPC server Optional: Foundation fieldbus • Standard: None • Optional: Memory capacity (linear and/or circular type)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...