UV intensity monitor, part 170001-0001-03, for older Hanovia medium-pressure ultraviolet disinfection systems. The monitor is the measuring element the system uses to prove delivered dose: it reads UV intensity through a window into the treatment chamber, and its output drives the low-dose alarm and any regulatory dose record, so a drifting or failed monitor is a compliance problem and not only a maintenance one. This part number is also stocked on trade-in terms under reference 2280-1110, supplied against the return of your existing sensor at a lower price — worth comparing before ordering. Reference number 2268-0509.