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FRARegulátor variabilního průtoku

FRA is a measuring unit with a measuring cross used for measuring volume air flow rate in rectangular duct systems.

FRA is equipped with a regulator, providing an output signal that is proportional to the volume air flow rate. FRA can be used to monitor the actual airflow or can be used to control a volume flow regulator.

Regulators comes with either flow sensor (D3) for clean air or membrane sensor (M1) for contaminated air.

The FRA needs a certain distance of straight duct before the unit and this has to be observed to obtain a stable and accurate air flow regulation.

To avoid clogging of the measuring cross, it is recommended to use VRU only in applications with clean air, meaning free of dust, particles and similar.


• Belimo MP, Modbus, BACnet & analogue control 0(2)-10V.
• Integrated NFC interface, compatible with Belimo Assistant App.
• Tightness class B according to EN1751.

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