Apparatus for determining the freezing point of a liquid

Details Apparatus for determining the freezing point of a liquid Apparatus for determining the freezing point of a liquid

1975-07-16

1976-10-19

Goldstein, Herbert

Measuring and testing

Gas content of a liquid or a solid

By vibration

73 671, G01N 2502

Patent

active

039863859

ABSTRACT:
Apparatus for determination of the freezing point of a liquid or solution has a probe extending into the liquid with means for vibrating the probe. Fixed elements which are cooled, e.g. Peltier plates, are arranged adjacent probe so that a mantle of solid forms on these elements and grows to touch the probe, thereby changing the resonant frequency. This change in resonant frequency is sensed and used to control the cooling so that the probe remains just in contact with a surface where solid is forming, i.e. in liquid at the freezing point. The probe temperature is sensed electrically, e.g. with a resistance thermometer.

REFERENCES:
patent: 2437194 (1965-03-01), Harrington
patent: 3201970 (1965-08-01), Beaugh
patent: 3202602 (1965-08-01), Beaugh
patent: 3600933 (1971-08-01), Johnston et al.

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