孔板流量計F O Turbo-Lux 2 The FO Turbo-Lux 2 orifice plate flowmeter is used to measure the volume of water in closed pipelines. Any mounting position and flow direction are possible. The main application is in stationary sprinkler systems. The flowmeter complies with the requirements of the Verband der Schadenversicherer e.V. (VdS) (association of damage insurers).