Patent ID: 8871084

Claim:
Fluid filter comprising: a collecting chamber for collecting a liquid separated out from a fluid; a filter insert having a filter medium that is a fluid-permeable filter; a liquid sensor assembled at a lower end of the filter insert; at least two protective walls, an inner protective wall and an outer protective wall, that at least partially shield the liquid sensor and selectively prevent the separated-out liquid from impinging on the liquid sensor, the at least two protective walls extending laterally from the liquid sensor, the inner protective wall extending radially around the liquid sensor and having at least one inner-wall through-opening and the outer protective wall extending radially about the inner protective wall and having at least one outer-wall through-opening; wherein the collecting chamber is arranged below the filter medium and the liquid sensor is arranged above the lowest point of the collecting chamber; wherein the inner-wall through-opening and outer-wall through-opening effect a labyrinthine flowpath that forces fluid flowing through the labyrinthine flowpath to change direction of flow multiple times, yet enables radial flow of the fluid from the collecting chamber surrounding the at least two protective walls to the liquid sensor; and wherein the inner-wall through-opening and the outer-wall through-opening are placed at least as high as the level of the liquid sensor.