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These modes of operation are provided as standard on all models of Ascott Atmosfär chamber. It provides a facility whereby the chamber can be used to create condensation humidity conditions (fixed at 95 to 100%RH) at elevated temperatures (user adjustable up to +55°C/+131°F) and is designed to meet a wide range of international standards for such testing. The control system fitted to Ascott CCT chambers enables the user to program whether condensation humidity is conducted alone, for tests such as ASTM D2247, or in sequence with other climates, to form a cyclic corrosion test, for automatic execution by the chamber. All Atmosfärs are additionally supplied with a separate free-standing air temperature conditioning unit (ATCU), capable of refrigerating its atmosphere from ambient to -40°C (highest specification). This atmosphere is circulated at high velocity between the ATCU and the Atmosfär chamber to which it is connected, to create a refrigerated, homogeneous climate inside the CCT chamber. The control system fitted to Ascott Atmosfär chambers enables the user to program whether refrigeration is conducted alone, or in sequence with other climates, to form a cyclic corrosion test, for automatic execution by the chamber.