Protective device for a sensor

In order to further improve the protection device for a sensor, in particular an air mass sensor, in the measuring tube (1) is proposed, preferably to install two wings direct the air and water in a certain direction and release a so-loaded medium thereof. The orientation (delta) of the wings (10) should be between 30 ° and 90 ° may be variable to the vertical. In addition, the round bar (3) is installed to the vertical at an angle (chi) of 20 DEG.