PROBE HEAD HAVING GAUGE ACOUSTICALLY INSULATED FROM WINDOW

A system for removing deposits from measuring instruments measuring chosen characteristics of a fluid medium contained in a pipe or container. The measuring instrument includes a window (10) and a first surface (12) having contact with the medium. The first surface is positioned on one end defining a probe head (2) of an elongated member (13) adapted to extend through the wall of the pipe or container. The outer end of the member is positioned outside the wall. The cleaning system includes an acoustic transducer positioned on the other end of the elongated member. The acoustic transducer is acoustically coupled to the elongated member so as to couple acoustic energy thereto. The acoustic energy propagating along the member to the end (2,12) of the probe is in contact with the fluid inside the pipe or container, the resulting vibrations of which remove any contaminations from the window by inducing cavitation.