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This article deals with the determination of the magnitude and sign of the three components of the instantaneous velocity vector from the output signals of a triple‐sensor hot‐wire probe. All three sensors lie in the same plane with a given angular orientation. Measurements with this triple probe are performed with the wire plane inclined at an angle of about 45° to the main transport direction of the fluid, thus ensuring high sensitivity of the probe and the determination of the three components of the instantaneous velocity of the flow in magnitude and sense. Furthermore, the region of applicability and the accuracy of the values of the flow parameters of the method are discussed.