Patent ID: 8901499

Claim:
An apparatus comprising: a module assembly, the module assembly including: a module assembly housing, a first faceplate having a first optical port, an analysis unit rigidly attached to the first faceplate, the analysis unit configured to receive a sample to be analyzed by the apparatus, the sample attenuating light introduced into the analysis unit via the first optical port; and a main assembly, the main assembly including: a main assembly housing, a second faceplate having a second optical port, and an engine unit rigidly attached to the second faceplate, the engine unit generating the light that passes to the analysis unit via the first and second optical ports; a first alignment in attached to the second faceplate; a second alignment pin attached to the second faceplate; a first hole in the first faceplate; and a second hole in the first faceplate, wherein the first alignment in mates with the first hole and the second alignment pin mates with the second hole when the main assembly is attached to the module assembly.