| 20120055246 | ACOUSTIC LIQUID MEASUREMENT - A device is disclosed for providing a temperature compensated measurement of the level of a liquid in a tank. The device includes a transducer for transmitting and receiving acoustic signals, a waveguide connected to the transducer and adapted to extend into the liquid, and at least one device for directing a flow of heat transfer fluid originating from a heat transfer system along the exterior of a portion of the waveguide which during operation is located above the liquid level. Further, a device is disclosed for controlling a heat regulating device adapted to regulate a temperature of a liquid in a tank, including a transducer for transmitting and receiving acoustic signals, a waveguide connected to the transducer, the waveguide having a reference portion located above the liquid surface, and a control device configured to measure the speed of sound in the reference portion as an indication of a temperature in the liquid, and control the heat regulating device based on the indicated temperature. | 03-08-2012 |
