The FBGuard 850 is the first complete industrial FBG interrogation unit for high accuracy static and dynamic measurements of Fiber Bragg Grating (FBG) sensors for infrastructure related applications. High spectral resolution combined with broad wavelength range provides high-resolution interrogation monitors allowing measurement of a large number of FBG sensors. It can monitor up to 4 different optical lines each containing multiple FBG-sensors. The interrogator is controlled by an internal embedded PC and is independent from external devices and control procedures. It has a very user-friendly access via the World Wide Web, three direct relays for real time alarms and a ruggedized construction.