Rotor temperature control and calibration

Details Rotor temperature control and calibration Rotor temperature control and calibration

1987-05-22

1989-05-30

Wayner, William E.

Refrigeration

Processes

Treating an article

374133, 494 1, B04B 910

Patent

active

048338915

ABSTRACT:
To enable centrifuging to occur at precisely determined sample temperatures, a method of centrifuge calibration which permits rapid and accurate refrigeration of the rotor containing the sample is disclosed. A rotor with sample to be centrifuged is placed within a centrifuge can. Temperature of the radiometer T.sub.ra, and temperature of the surrounding refrigerating can T.sub.c is determined at a first time, t.sub.0. Thereafter, and at a second time t.sub.1, temperature of the radiometer T.sub.ra, and the temperature of the surrounding refrigerating can T.sub.c are equilibrated. The temperature excursion between t.sub.0 and t.sub.1 for the temperatures of the radiometer T.sub.ra and the temperature of the refrigerating can T.sub.c are measured to yield respective .DELTA. T.sub.ra and .DELTA. T.sub.c. The radio of .DELTA. T.sub.ra /.DELTA. T.sub.c is taken to give a constant which comprises the view factor from the radiometer for the particular shape of rotor and the surrounding can. Thereafter, the temperature of the rotor Tr will equal the temperature of the radiometer plus the temperature of the radiometer minus the temperature of the refrigerating can T.sub.c times the determined view factor. It is thereafter possible to maintain a large temperature differential between the refrigerating can and the rotor and bring the rotor (and necessarily the sample) rapidly to a precise temperature where centrifuging can rapidly follow.

REFERENCES:
patent: 3347453 (1967-10-01), Goergen
patent: 3409212 (1968-11-01), Durland et al.

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