There are a number of companies selling NIR instrumentation. These are a few worth considering.
Buchi
Buchi supplies mostly lab-based instruments, hardened enough to transport to a warehouse or process line. Their instrument is based on a polarization interferometer. They offer a nice statistical package with their software.

CDI Pharma
Control Development provides low cost diode array benchtop instruments as well as a wireless instrument for following pharmaceutical processes in the process stream.

FOSS
FOSS, one of the first NIR companies in the world, supplies benchtop and process instruments. Based on grating technology, they offer many software features absent in other packages.

Foss provides laboratory and process, grating-based instruments. One of the first NIR companies, it has over 30 years of experience in the field.