FLUXUS G704 CA - Non-invasive compressed air flow measurement - with the FLUXUS G704 CA


The FLUXUS G704 CA compressed air flow meter is the ideal measuring system for:

  • Fast and unmistaken identification of possible overloads (due to e.g. air velocities which are too high) or malfunctions in the compressed air network
  • Exact assignment of consumption proportions to individual production stages, offering possibilities for fact-based, economic decisions
  • Indication of the amount of compressed air lost as a result of leaks

Due to its rugged design, it is engineered for usage in any kind of industrial environment.

It measures with the highest possible accuracy on pipes with nominal diameters between DN7 and DN250 and from a pressure level of 3 bar upwards on steel pipes and on plastic pipes from atmospheric pressure.

Technical Datasheet
tsfluxus_su_g704ca - en-gb.pdf
Adobe Acrobat Document 200.1 KB

Compressed air is a very expensive form of energy. This is due to its efficiency: for every joule of mechanical work which is done with a pneumatic tool, approximately twenty times the amount of electrical energy must be spent. However, despite this poor yield, compressed air is practically indispensable in many industries because of its production-related advantages. This makes it all the more important to use the valuable medium as efficiently as possible.

Measurement creates Transparency

If you want to avoid waste it's necessary to measure. Through the precise detection of the current volume flow, components of a system can be dimensioned in a particularly cost-effective manner through the fast and unmistaken identification of possible overloads (such as when air velocities are too high) or malfunctions in the network. The exact assignment of consumption proportions to individual production stages also offers possibilities for fact-based, economic decisions. Moreover, the volume-flow measurement indicates the amount of compressed air lost as a result of leaks – an important economic factor, as every third compressor is operated only to compensate for air losses.
But how do you best measure compressed air flows? Non-invasively, of course!

The  FLUXUS G704 CA compressed air flow meter is thus the ideal solution. FLEXIM’s non-invasive clamp-on ultrasonic technology is unique in that it can be applied to measure compressed air flow rates even at very low pressures (down to 3bar on steel lines and atmospheric pressure on plastic lines). Also even the lowest flow rates are accurately captures revealing the slightest flow rates from the smallest leaks where there should be none.

For this reason, the FLUXUS G704 CA is particularly suitable for non-invasively measuring quantities drawn off at individual points in the compressed air grid as well as detecting leaks within it. Due to being non-invasive by principle, the FLUXUS G704 CA can never be a potential source of leaks by itself.


  • Reliable and maintenance-free compressed air flow measurement from the pipe wall outside (starting at 3 bar on steel pipes; atmospheric pressure and below at plastic pipes)
  • Highly accurate due to paired, temperature compensating and traceable calibrated ultrasonic transducers
  • Extremely high measuring dynamics from the lowest to the highest flow velocities
  • Simple, cost-effective retrofitting without any disruption to supply and pipe works
  • No risk of leakage, No pressure losses
  • Bidirectional measurement: simple recognition of the flow direction


Flow channels

1 or 2

Operating temperature of the transmitter

-20°C ... 60°C

Degree of protection Transmitter


Explosion protection

ATEX, IECEx Zone 2 optional


2, Available are: temperature (Pt 100, Pt 1000), current


4, Available are: switchable current, binary

Communication Protocol

Modbus RTU, M-Bus, BACnet MS/TP, RS485

Media temperature

-40°C ... +100°C

Pipe diameter range

15 mm ... 250 mm

Flow velocity range

0,01 ... 35 m/s (dependent on pipe size)

Measurement accuracy

±1% ... 3% of reading, ±0,01 m/s, depending on application

±0,5% of reading, ±0,01 m/s, field calibrated


±0,15% of reading, ±0,01 m/s

Additional Notes

Minimum operational pressure: 3 bar on steel pipes, atmospheric pressure and below on plastic pipes