G - Physics – 05 – D
Patent
G - Physics
05
D
324/21, 341/27
G05D 23/26 (2006.01) H01H 37/58 (2006.01)
Patent
CA 1235457
ABSTRACT OF TOE DISCLOSURE An apparatus and method for controlling the operating temperatures and differential temperature of a curie effect temperature sensing switch is disclosed. The temperature switch is adapted to provide temper- ature control of a cold plate in a reagent refrigerator. The temperature switch activates cold plate cooling devices when the cold plate temperature is above a first operating temperature and deactivates the cold plate cooling devices when the cold plate temperature is below a second operating temperature. An electron magnet is fixed external of and relative to the tempera- ture switch so that the strength of the external magnetic field sets the operating temperatures of the temperature switch. A potentiometer is used to incrementally vary the current supplied to the electromagnet to thereby incrementally adjust the strength of the external magnetic field and the operating temperatures. A micro- processor may be provided to adjust the voltage supply of the potentiometer, which allows remote control of the operating temperatures. A second potentiometer is connected to the electromagnet so that it incrementally adjusts the current passed to the electromagnet as a function of whether the temperature switch is open or closed. Incremental adjustment of the second potentio- meter provides incremental adjustment of the temperature differential. A monitor provides a warning signal if the temperature switch does not open and close within a predetermined time interval.
492278
Abbott Laboratories
Goudreau Gage Dubuc
LandOfFree
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