G - Physics – 01 – K
Patent
G - Physics
01
K
340/139, 354/29,
G01K 3/00 (2006.01) F25B 21/02 (2006.01) G01K 1/16 (2006.01) G01N 25/04 (2006.01) G01W 1/14 (2006.01)
Patent
CA 1163461
- 14- ABSTRACT OF THE DISCLOSURE . A portion of the test liquid is placed in the middle of a cooling plate having a central recess in which a thermometer probe is embedded in a heat-insulating material. Two Peltier elements disposed beneath the plate are connected in series and can be energized via a switch or a relay contact, thus chilling the portion of liquid. The probe may be connected to a voltage source and to an oscillograph which displays the voltage drop caused by the cooling liquid in the form of a curve. In another embodiment, the probe is series-connect- ed to a constant-current source, and the voltage drop is amplified and supplied to an analog-to-digital converter connected to a microprocessor which both initiates the chilling operation and orders the A-D converter to sample the voltage and supply the equivalent digital value to the microprocessor itself. This order is repeated at regular intervals so that digital values corresponding to the solidi- fication curve of the liquid can be stored in the micro- processor and evaluated there upon termination of the chilling process in order to determine the freezing point of the liquid, which temperature is then digitally dis- played.
381612
Boschung Marcel
Zehnder Walter
Boschung Mecatronic Ag
Robic Robic & Associes/associates
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