Model A2G-25

Air flow meter

For ventilation and air-conditioning

Selected documents
Sales contact

WIKA Danmark A/S

+45 4581 9600


  • For measuring the air flows of radial ventilators
  • For measuring air flows in ventilation pipes and ducts in conjunction with the model A2G-FM measuring probe
  • Measurement of differential pressures

Special features

  • Electrical output signal DC 0 … 10 V or 4 … 20 mA, can be selected directly at the instrument via jumpers
  • Output signal for air flow and differential pressure in one instrument
  • Simple and fast installation and commissioning
  • Maintenance-free
  • Maximum operating pressure 20 kPa


The model A2G-25 air flow meter is used for measuring air flows of gaseous media in ventilation and air-conditioning applications.

The air flow is measured by determining the differential pressure and multiplying it with the K factor. The K factor depends on the ventilator used or, when using pipe/duct measuring probes, on the size and number of probes. The K factors of all radial ventilators from common manufacturers are already programmed in the menu of the A2G-25. When using the model A2G-FM measuring probe or a different ventilator K factor, this can be quickly and easily entered in the menu of the instrument.

Electrical analogue output signals for both measurement parameters (DC 0 ... 10 V or 4 ... 20 mA; adjustable in the instrument via jumpers) or the digital Modbus® versions enable the direct connection to control systems or the building automation system.

The measured differential pressure is also shown on the LC display and transmitted via the analogue or digital output signals. Thus the A2G-25 combines two measurements in one instrument. The LC display and the clear menu navigation enable a time-saving and simple commissioning.

With the A2G-25, air flows up to 200,000 m3/h and differential pressures up to 7,000 Pa can be measured.

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