The Core Facility of MSG occupies the upper half of the overall rack and includes the large work volume (WV), an airlock and electronics for control, housekeeping and investigation resources. The WV holds the experiment and related equipment. The work volume is approximately 3 feet (910 mm) wide, 2 feet (610 mm) high, and 1.5 feet (460 mm) deep with a usable volume of about 255 litres. This area can be sealed and held at a negative pressure, isolating the crew and the Station from possible hazards associated with the investigations that are taking place inside.[3]
An airlock under the WV can be accessed to bring objects in safely while other activities are going on inside MSG. The MSG has 40 cm diameter side ports (equipped with rugged gloves that are sealed to prevent leaks) for setting up and manipulating equipment in the WV. A cold-plate provides cooling for experiment hardware and the air can be continuously circulated and filtered. Experiments are provided with 1 kW of power and cooling.[3]
Vacuum, venting, nitrogen gas dilution (that can keep the work volume oxygen volume fraction below the standard ISS atmosphere (nominally 21% by volume) down to 10 percent or less), power and data interfaces are also provided within MSG. A video system consists of a self-standing subsystem of four colour cameras, two monitors, two analogue recorders and two digital recorders integrated into an International Sub-rack Interface Standard (ISIS) drawer. The command and monitoring panel monitors the facility status and performance and provides for manual operation of MSG by the crew.[3]
MSG was delivered to ISS during Expedition 5, whereupon it was installed in the Destiny module. On March 21, 2008, during Expedition 16, MSG was relocated to the Columbus module.[1] On October 21, 2010, during Expedition 25, MSG was transferred back to the Destiny module.
The MSG on the ISS was utilized until 2010 for a large body of research. The MSG had operated on orbit for more than 3500 hours by 2010; used by various types of investigations, including material science, thermal management, protein crystal growth, life sciences, fire detection, combustion and technology demonstration. The versatility of the resources MSG provides makes it an ideal platform for microgravity research (Spivey 2006 - 2008).[1]