AbstractThe building of Pb17Li experimental loops made us to develop a flowmeter for the eutectic alloy. The electromagnetic flowmeter type has been chosen due to the experience gained in sodium activities. One should have a reliable and “flexible” calibration system in order to assure the initial calibration of the flowmeters and the possibility of following checking, made necessary by the changing of the electric conductivity of the duct after use. In the wide operating range of flowrate (40 ÷ 260 cm3/s) and temperature (350 ÷ 500°C) it has been shown that the calibration method is affected by ∼ ± 2% total error. A semi-theoretical calibration procedure has been followed as well. Results turned out to be very close to the experimental ones (maximum difference is about 7%).