Abstract
A desktop liquid thermostat designed for keeping unchanged the temperatures of test tubes with samples under study in the range from –20 to +70°C is described. The device consists of two units—a temperature-controlled container and heating–cooling unit connected to the container with a flexible hose in which a liquid heat carrier circulates. To maintain high temperatures (> 40°C), the heat carrier is heated by an electrical heater. To cool it below room temperature, the unit uses thermoelectric converters based on the Peltier effect. The accuracy in maintaining a given temperature is up to ± 0.2°C, and the time of cooling from room temperature down to –20°C does not exceed 10 min.
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