Subject to change without notification. GSG6725V6-3ENFLUXUS® is a protected trademark of FLEXIM GmbH. page 1 of 4

Data Sheet

FLUXUS® G6725 for Gases

Features

The Portable Flowmeter

FLUXUS® G6725

Automatic transducer detection

FLUXUS® G6725 is a portable ultrasonic flowmeter. Withits clamp-on transducers and its rechargeable battery, it isan ideal tool for service work.

Since the transducers are mounted on the pipe, they arenot subject to wear and tear and can be installed rapidly,without cutting into the pipe and without process interrup-tion. The measurement causes no pressure loss and issuitable for all pressure stages. Chemically aggressivemedia are not a problem; there is no need for expensivematerials.

The transducers and their conduit are made of stainlesssteel and are suitable for use in harsh industrial environ-ment. Watertight transducer and integrated robust trans-ducer cables make it possible to obtain goodmeasurement results over a long period of extensiveusage.

Thanks to their exceptional dual-µP technology with DSP,high number of measuring cycles per second and adap-tive signal processing, the FLUXUS® G6725 flowmeterproduces stable and reliable measuring results evenunder difficult conditions.

The integrated flow calculator can perform a standard vol-umetric flow or mass flow correction according to ISO12213-1. The connected process pressure and tempera-ture measurements are used for the calculation.

All FLEXIM flow transducers for gases can be connected.Which gas transducers are appropriate for a particularapplication depends amongst others on the wall thick-ness, diameter and material of the pipe as well as on thegas flow velocity.

You will find more information about the transducers in thecorresponding specification sheet. Our application engi-neers will be glad to offer you expert advice. Call for anapplication review today!

• Precise, bi-directional flow measurement with high measurement dynamics• Measurement effect is unaffected by gas density, viscosity and composition

and by dust, humidity and temperature• Not sensitive to velocity peaks• Long-term stable measurement results• High measurement rate, fast response time• Calculation of the standard volumetric and standard mass flow acc. to ISO 12213-1

GSG6725V6-3EN Subject to change without notification. page 2 of 4 FLUXUS® is a protected trademark of FLEXIM GmbH.

Technical Data

MeasurementMeasuring principle: transit time difference correlation

principleflow velocity: (0.01...25)m/s, pipe diameter

dependentRepeatability: 0.15% of reading ± 0,01m/sAccuracy (for fully developed, rotationally

symmetrical flow profile)- Volume flow: ± 1%...3% of reading ± 0.01m/s

depending on application± 0.5% of reading ± 0.01m/s with process calibration

- Path velocity: ± 0.5% of reading ± 0.01m/sMeasurable gases: Ratio of the characteristic acoustic

impedances of the pipe wall to that of gas < 3000

TransmitterHousing

- Weight: approx. 3.9 kg- Degree of protection: IP54 acc. to EN60529- Material: aluminum, powder coated- Dimensions: (270x100x180)mm (WxHxD)

without handleFlow channels: 2Power supply: rechargeable battery (6V/4Ah)

or external power supply (100...240)VAC

Operating time with battery:

>10h

Display: 2 x 16 characters, dot matrix, backlit

Operating temperature: -10°C...60°CPower consumption: < 15WSignal damping: (0...100)s, adjustableMeasuring cycle: (100...1000)Hz (1 channel)Response time: 1s (1 channel), 70ms opt.

Measuring functions:Physical quantities: Volume and mass flow rate, flow

velocityTotalizers: volume, massCalculation functions: Average, difference, sumOperating languages: English, German, French, Dutch,

Spanish

Data loggerLoggable values: All measured quantities and

totalized valuesCapacity: >100000 measured values

CommunicationInterface: RS232, RS485 optionalData: actual meas. value, logged data,

parameter records

Software FluxData (optional)Function: Downloading meas. data/

parameter records, graphical presentation, conversion to other formats

Operating systems: all WindowsTM versions

Outputs (optional)The outputs are galvanically isolated from main device.- The maximum number of outputs that can be installed depends on the output type. Contact FLEXIM for more information.Current

- Measuring range: (0/4...20)mA - Accuracy: 0.1% of reading ± 15μA- Active output: Rext < 500Ω- Passive output: Uext < 24V, Rext < 1kΩ

Voltage- Measuring range: (0...1) V or (0...10) V- Accuracy: 0...1V: 0.1% of reading ± 1mV

0...10V: 0.1% of reading ± 10mV- Internal resistance: Ri = 500 Ω

Frequency- Range: 0...1kHz or 0...10kHz - Open collector: 24 V/4mA

Binary- Open collector: 24 V/4mA- Reed contact relay: 48 V/0.25A- Function as state output:

limit, sign change or error

- Properties of the pulse output (OC):

value: (0.01...1 000)unitsWidth: (80...1 000) ms

Inputs (optional)- The inputs are galvanically isolated from the main device.- A maximum of 4 inputs can be installed.Temperature

- Type: Pt100 four-wire circuit- Range: -50°C to 400°C- Resolution: 0.1 K- Accuracy: ± (0.2K + 0.1% of reading)

Current- Range: active: (0 ...20) mA

passive: (-20 ...20) mA- Accuracy: 0.1% of reading ± 10μA- Active input: Ui = 15V, Ri = 50Ω, Pi < 0,5W,

not short-circuit proof- Passive input: Ri = 50Ω, Pi < 0.5W

Voltage- Measuring range: (0...1)V or (0...10)V- Accuracy: 0...1V: 0.1% of reading ± 1mV

0...10V: 0.1% of reading ± 10mV- Internal resistance: Ri= 1MΩ

Wall thickness gauge (optional)Range: (1.0...200) mmResolution: 0.01 mmLinearity: 0.1 mmOperating temperature:

- Standard: -20°C...+60°C- High temperature: 0°C...+200°C, for short periods up

to +540°C

Subject to change without notification. GSG6725V6-3ENFLUXUS® is a protected trademark of FLEXIM GmbH. page 3 of 4

Flow transducersThe application of the gas flow transducers depends mainly on the following parameters: wall thickness, pipe diameterand material, flow velocity of the gas. The standard transducers (shear wave transducers, type GS) can be used in a widediameter range. Together with the flowmeter 6725, they are best choice for service, maintenance, trouble shooting andcheck of permanently installed instruments. The Lamb wave transducers (type GL), however, are adapted to a fixed wallthickness range. The are best applicable for the measurement at high flow velocities and of gases with high damping. Wewill assist you in the selection of appropriate transducers for your application. Our consulting engineers will be pleased tocounsel you.

Application Range of the Shearwave Transducers Important: The typical application range is valid for good measuring conditions with a flow velocity of 15 m/s in a pipewith a wall thickness of 40 mm and a number of sound paths of 1. The possible application range is valid for a numberof sound paths of 1. The upper limit of the pipe diameter range is reduced with increasing flow velocity.

Application Range of the Lamb Wave Transducers

Important: The typical application range is valid for good measuring conditions with a flow velocity of 15 m/s and a measurement in reflection mode. The possible application range is valid for a number of sound paths of 1.

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FLEXIM GmbHWolfener Str. 36D-12681 Berlin

internet: www.flexim.com Fon:+49 (30) 93 66 76 60e-mail: info@flexim.com Fax:+49 (0)30 93 66 76 80

Dimensions of the Transmitter (in mm)

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