Patent ID: 6324857
Filing Date: 2001-12-04
Classification: B01L,F25B,G05D

Abstract:
A laboratory thermostat (1)comprising a bath container (2) for aliquid (3) to be tempered, a refrigerating unit (4) for cooling the liquid comprising a refrigeration cycle having a compressor (5), a condenser (6), a first evaporator (8), and an expansion valve (7) serving as a mass flow regulator and controlled by a temperature sensor (10), a regulation device (11) connected to a temperature actual value sensor (12) for measuring a bath liquid temperature, and a tempering apparatus comprising a heating unit (13) controlled by the regulation device (11) and a refrigerating device (15) comprising a second evaporator (17) connected to the refrigeration cycle via a capillary tube (16), the tempering apparatus being in thermal contact with the temperature sensor (10) for increasing a refrigerating capacity of the refrigerating unit (4) by heating the temperature sensor (10) with heating unit (13) when the bath liquid temperature is higher than a bath target value temperature and for reducing the refrigerating capacity of the refrigerating unit (4) by cooling the temperature sensor (10) with the refrigerating device (15) when the bath liquid temperature is lower than the bath target value temperature.