Hypsometer having controlled heating, particularly for use...

Details Hypsometer having controlled heating, particularly for use... Hypsometer having controlled heating, particularly for use...

G - Physics

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G01L 11/00 (2006.01) G01W 1/08 (2006.01) G01W 1/10 (2006.01) G05D 23/24 (2006.01)

Patent

CA 2018342

The hypsometer comprises an open boiling vessel consisting of a vessel flask containing the measuring fluid and of a ves- sel neck attached to said vessel. An electrical heating re- sistor plunges into said measuring fluid. A temperature sensor measures the boiling temperature of said measuring fluid. The hypsometer comprises an adaptive control system for stabilizing the position of condensation zone in the vessel neck which ad- justs the heating capacity to a command value corresponding to the specific boiling temperature involved. In the simplest case, such control is realized by using, as heating resistor, a thermistor having a negative temperature coefficient. In this way, the heating capacity is adjusted, over the whole pressure range, to the specific needs. Thus, on the average, less heat- ing capacity is needed, resulting in a considerable reduction of the battery weight.

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