A reach-in temperature-cycling vacuum chamber will be used for temperature altitude testing of aircraft collision avoidance radars. Manufactured and delivered by Tenney Environmental, New Columbia, Pa., the operating temperature range of the vacuum chamber is -94 to 351°F (-70 to 177°C) with temperature control of ±1.8°F (±1°C). 

The unit has vertical air circulation, and the refrigeration system utilizes a customer-requested liquid nitrogen (LN2) modulating cooling system that permits extreme low temperatures to be achieved with rapid pull-down. The LN2 is routed through an internal evaporator coil, which allows the system to control both temperature and altitude at the same time. The cycling chamber’s programmable controller includes RS232 serial communications and advanced Ethernet capabilities.