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A temperature control unit (TCU) (also called "temperature controller") is typically used to preheat an industrial process and maintain the desired temperature.A TCU works by using an electric heater, either immersion or continuous, to heat the fluid in the system, then circulating it from the TCU to the machine tools and vice-versa. The fluid used may be water, pressurised water or oil, depending on the temperature range. Usually this is water if T < 95°C, pressurised water if T< 150-160°C and oil for T from 200 to 400°C.
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