Device for measuring the condensation temperature of a gas or a vapor

Claim 1

Device for measuring the condensation temperature of an organic or inorganic vapor or gas, comprising two electrically conductive plates insulated electrically from one another and spatially separated from one another by a space free of any solid material and arranged to contain such gas or vapor, one of said plates presenting a surface on which a condensate of such gas or vapor is deposited under appropriate conditions; cooling means operatively associated for cooling said surface through a temperature range containing the temperature at which such gas or vapor will begin to condense; a temperature measuring device positioned as close as possible to said surface for providing an indication of the temperature of said surface; said insulated plates forming an electric capacitor of a given capacitance when the space which separates them is occupied by a vapor or gas and of a markedly different capacitance when a condensate is deposited on said one of said plates; and a device for measuring the capacitance of said capacitor and detecting a predetermined variation in this capacitance, the temperature to be measured being that given by said temperature measuring device at the instant when this variation is detected.