Never touch the surface of the grating or the mirrors inside the unit. Immediate and permanent damage will result. Wear soft cotton gloves when working with gratings. Note that on top of the grating is an arrow which should be pointing towards the entrance slit when the grating is mounted. No additional alignment is necessary.
Installation is straightforward.
The nitrogen inlet valve is installed by simply removing one of the threaded plugs located at various points on the monochromator. The inlet valve is then threaded into this hole. Ensure that the threads are properly matched. Each of the slit assemblies has two sets of four flat-head machine screws. Optical accessories may be attached by removing the appropriate set of screws and threading the accessory mounting screws into the holes.