Cooling

Proper operation of the lamp requires adequate cooling of the magnetron and the bulb. (See Appendix C, page 129, for irradiator cooling requirements.) Cooling air from a blower goes through the magnetron cooling fins and into the lamp housing. At this point, the airflow splits into two paths: one path exhausts through the irradiator housing vent holes, and the rest of the air flows into the cavity through cooling holes in the reflector. This airflow cools the bulb and exhausts through the RF screen.

Irradiators

The I300M irradiator family is the heart of the UV system. For example, the model I300M contains both the 15.2 cm (6") long electrodeless lamp bulb mounted in the elliptical reflector and the magnetron which energizes the bulb. The reflector is elliptical in cross-section and the lamp bulb is mounted at the focus of the ellipse, producing an intense strip of light at the other focus of the reflector (53 mm [2.1"] below the bottom rails of the lamp).

M3 screen retaining screws (4) (2 per side)

RF screen

Cooling air holes

Lamp bulb

CavityReflectorFigure 2. Reflector Assembly

18F300S/F300SQ Ultraviolet Lamp System