• PW254 GERMICIDAL LAMP DETECTOR Sensors_UW254-360-.pdf
UVC is the most effective part of the ultraviolet spectrum for germicidal applications. All mercury lamps, with transmissive bulb enclosures, emit considerable UVC. The remaining 5% is distributed between UVB and visible radiation. Medium and high pressure mercury lamps have more UVC than low pressure lamps but a decreased percentage of UVC relative to UVB.
The PW254 is sensitive to UVB as well as UVC. With low pressure mercury lamps, the UVB sensitivity of the PW254 is of little consequence. When higher pressure mercury lamps are used, an accurate UVC reading requires a UVB blind PW254 detector, which is also available.