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Low-speed (typically up to 10,000 rpm) free-standing centrifuges designed with a mechanism to keep the rotor chamber cool. These centrifuges are typically large stationary structures and consist of an electric motor, a shaft, a tachometer, and speed and time controls; they also include a rotor on which one of several interchangeable heads is mounted and a compressor and other associated devices needed to keep the rotor chamber cool. The refrigeration components of low-speed refrigerated centrifuges are used mainly to keep the rotor chamber from overheating and to control the temperature to facilitate performance of temperature-sensitive laboratory assays such as enzyme and complement tests.
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