Abstract: An accelerated weathering apparatus includes a test chamber (30), a specimen supporting means (34), a light source (60) powered by a power source controlled by a ballast, at least one chamber air temperature sensor (26), a black panel temperature sensor (36), and a multiple blower system and control means (52). A first blower (12) draws and circulates outside or fresh air and as second blower (46) optionally draws recirculated air into an air mixing duct. The speeds of the fresh air and recirculated air are independently regulated and controlled by a blower controller based on the chamber air temperature and black panel temperature, respectively. In addition, a humidifier (18) and humidity controller (20) regulates humidity within the system as required.

Abstract: An accelerated weathering apparatus includes a test chamber (30), a specimen supporting means (34), a light source (60) powered by a power source controlled by a ballast, at least one chamber air temperature sensor (26), a black panel temperature sensor (36), and a multiple blower system and control means (52). A first blower (12) draws and circulates outside or fresh air and as second blower (46) optionally draws recirculated air into an air mixing duct. The speeds of the fresh air and recirculated air blowers are independently regulated and controlled by a blower controller based on the chamber air temperature and black panel temperature, respectively. In addition, a humidifier (18) and humidity controller (20) regulates humidity within the system as required.

Abstract: An accelerated weathering apparatus includes a test chamber (30), a specimen supporting means (34), a light source (60) powered by a power source controlled by a ballast, at least one chamber air temperature sensor (26), a black panel temperature sensor (36), and a multiple blower system and control means (52). A first blower (12) draws and circulates outside or fresh air and as second blower (46) optionally draws recirculated air into an air mixing duct. The speeds of the fresh air and recirculated air blowers are independently regulated and controlled by a blower controller based on the chamber air temperature and black panel temperature, respectively. In addition, a humidifier (18) and humidity controller (20) regulates humidity within the system as required.

Abstract: A compressed air system includes an air compressor the inlet of which is communicated to the vehicle engine turbocharger. The outlet of the air compressor is communicated through an air dryer to a storage reservoir. A governor is responsive to the pressure level in the reservoir to generate an unloading signal unloading the air compressor when the pressure in the reservoir attains a predetermined value. The unloading signal is also communicated through a control valve to purge the air dryer during compressor unloading. The control valve closes communication between the governor and the air dryer to trap a predetermined pressure level in the purge volume of the air dryer to prevent the air dryer from purging to atmospheric pressure. Accordingly, a predetermined air pressure level is maintained in the purge volume, so that the outlet of the turbocharger can never be communicated to atmospheric pressure.

Abstract: Mechanism for cleaning and drying compressed gas (10) includes a housing (12) having an open end closed by an end cover (14). A desiccant canister (16) is mounted on a plate (24) which is clamped between the end cover (14) and the housing (12) so that the canister (16) is received within the housing (12). A circuitous passage (78) communicates an inlet port (76) with a sump cavity (68) which is communicated with the canister (16). Heat is transferred from the gas to the walls of the passage (78) as the gas passes therethrough. The passage (78) cants toward the sump (68) so that moisture tends to drain into the latter. A dump valve (110) periodically communicates the sump cavity (68) with atmosphere to thereby regenerate the desiccant in the canister (16) and to void the contaminants from the sump cavity (68).