Apparatus for determining the freezing point of a liquid on or f

Details Apparatus for determining the freezing point of a liquid on or f Apparatus for determining the freezing point of a liquid on or f

1981-07-09

1983-05-17

Goldstein, Herbert

Thermal measuring and testing

Transformation point determination

By thermal arrest

364557, G01N 2504

Patent

active

043837700

ABSTRACT:
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-connected 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 solidification curve of the liquid can be stored in the microprocessor and evaluated there upon termination of the chilling process in order to determine the freezing point of the liquid, which temperature is then digitally displayed.

REFERENCES:
patent: 3367171 (1968-02-01), Kobayashi
patent: 3891834 (1975-06-01), Warsinski
patent: 4222044 (1980-09-01), Boschung
patent: 4304119 (1981-12-01), Uchigaki
Prager et al., "Freezing-Point Depression: New Method for Measuring Ultramicro Quantities of Fluid" in Science 10/63, vol. 142, pp. 237-239.
Der Chemielaborant, by Dr. Fritz Merten, Gebr. Janeke-Verlag, Hanover, 1966, p. 77.

Affiliated with

Also associated with

Rating

Apparatus for determining the freezing point of a liquid on or f does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus for determining the freezing point of a liquid on or f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for determining the freezing point of a liquid on or f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1565098