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Observator 100 years

DIFF Automatic Air Volume Flow Meter

This instrument – developed by Observator – is suitable for measuring air volume and air flow, fully automatically. The Diff Automatic Air Volume Flow Meter has a built-in fan and is based on the so-called ‘zero pressure compensation’. This measuring principle guarantees a very high accuracy and is therefore prescribed in various construction and ISSO standards. The instrument is suitable for measuring air quantities in both air supply and air return systems. With optional attachments, it is also possible to measure larger grilles, such as those used in the utility, for example.

It is designed to be self-adjusting, for both supply and extract systems. By placing the 250mm square aperture securely over the grille, the instrument is able to automatically detect the direction of the air flow. The adjustable display arms not only allow flexible operation, it also enables the system to be read from almost any angle. The DIFF will be supplied with DIFFiner PC-Software & data logging (free of charge).



  • Full automatic, quick and accurate pressure measurement
  • The characteristic of the air distribution system is not influenced by the measurements
  • Easy digital read-out by the possibility of different measuring position
  • Indication of flow direction and air temperature
  • Data logging by SD-card and use with pc-software DIFFiner
  • Ergonomic design and light weight for easy one person operation
  • Measuring in accordance with worldwide Standards
  • Energy, time and so costs saving
  • Divergent applications

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