Three new DigitalFlow gas ultrasonic flowmeters have been introduced by Panametrics, Inc. Each uses digital signal processing and the company's patented Correlation Transit-Time technique for accurate, drift-free measurement. They can be used under a wide range of conditions without impeding flow. Maintenance is minimal even in difficult situations because the flowmeters have no orifices to clog and no moving parts to wear out, the company reports.

All three systems are designed specifically for gas applications: GF868 for petrochemical and refinery flare gas, GN868 for natural gas transmission and pipelines, and GM868 for ultra-pure gas, incinerators and nuclear-related uses. Each system includes ultrasonic transducers to send and receive coded pulses, an electronic consoleoperated locally or remotelyand interconnecting cables. Digital signal processing and CorrelationTransit-Time technology increase accuracy by improving the signal-to-noise ratio and minimizing interference.



Applications
Operating reliably under the unsteady flow, pulsating pressure, wide flow ranges and varying temperatures typical of plant flare gas systems, the GF868 can measure velocities from 0.03 to 85m/second bi-directionally in pipes or stacks up to 3 meters in diameter and calculate mass flow using a patented method. The meter helps conserve energy and reduce product loss by identifying sources of leaks into the flare systems. It also helps improve compliance with pollution control regulations by accurately controlling the amount of steam fed to the flare tip.
In natural gas applications, the GN868, with its wide rangeability of 1500 to 1, can replace several conventional meters. It is used on pipelines to balance the flow within a system, in gas blending, and to help reduce the amount of "unaccounted for" gas. It accommodates both steady and pulsating flow in pipes 75mm to 1.2m in diameter and at pressures ranging from atmospheric to 20 MPa (2200psig). A dual-channel model of the GN868 can be used to measure flowrate in two separate pipes, or in one pipe, using two ultrasonic paths, for maximum accuracy.
Obstructionless installation configurations for the general purpose GM868 system's transducers meet most pipe or duct-size and other application-oriented requirements. It can measure flow velocities from 0.03 to 46m/second, with no pressure drop, in conduits ranging from 2.5cm to flue stacks 3m in diameter and larger.
Based in Waltham, Massachusetts, USA, Panametrics designs and manufactures analytical and measurement instrumentation for flow measurement, gas analysis and non-destructive testing. It has sales and service offices in 45 countries.

Caption:Panametrics' new DigitalFlow gas ultrasonic flowmeters provide accurate, drift-free measurements.

Note to the editors: DigitalFlow and Correlation Transit-Time are registered trademarks of Panametrics, Inc.
For further information please contact:
In Latin America/South America:
Panametrics Inc.
Alvaro Suescun - Sales Manager
221 Crescent Street
Waltham MA 02154-3497, USA
Tel: 1 617 899-2719; Fax: 1 617-894-8582