Philips Medium Pressure Mercury
Philips Medium Pressure Mercury lamps are available in a wide range of up to 180 W per centimeter, with an arc length between 10 and 140 centimeter. The lamps can be fitted with various types of end fitting from our catalogue, or equipped with customer special fittings, cables or pins. The lamps are made from selected types of quartz glass, with transmission characteristics tailored to the application.
Philips Medium Pressure Mercury lamps contain sophisticated quantities of mercury bromides, providing a self-cleaning halogen cycle, to control the depreciation of UV radiation over lamp life.
Main applications
- Deactivation of bacteria, viruses and other micro-organisms
- Water treatment (waste-, drinking- or process water)
- Surface treatment
- Advanced oxidation (with special quartz glass)
- Ship ballast water treatment
Spectral output
The lamps emit a wide band spectrum in the UVC range. In contrast to Low Pressure lamps, considerable amounts of radiation around the 254 nm is emitted. The power density is very high compared with Low Pressure lamps. Lamps can be made in special quartz to either substantially lower the emission below 240 nm, or to maximize radiation at 185 nm. The former type is used in installations where nitrite formation must be avoided; the latter type is used in installations for ozone production or advanced oxidation.
Operation
Philips Medium Pressure Mercury lamps can be tailored to operate on conventional electromagnetic or electronic drivers. Lamps in special frames for single ended operation are available on request. A permissible bulb temperature for HOK type lamps is in the 600 – 900 C range, for HTK type lamps 500 – 700 C. Permissible pinch temperature is 300 C, higher pinch temperatures up to 420 C are possible using the Philips patented Pinch Protection.