PPT - Perfect Performance Tool

  • Optimized amalgam lamps for water treatment applications
  • Constant UV output in a wide range of water temperatures at full power
  • Predictable UV output at all dimming levels even on very low and very high water temperatures
  • Standard lamp dimensions - existing UV system designs can be upgraded for better performance
  • ‘Out of arc’ amalgam lamps 250 – 1000W (= T9, T10 or T12) can be used as basis for PPT lamp designs
  • Ready to use - T10 and T12 ‘out of the box’ PPT lamp-ballast sets are available containing PPT lamp, suitable quartz sleeve and specific electronic ballast
  • Best energy efficiency
    = best cost efficiency
    = best carbon footprint
  • Reduction of power headroom of the UV system due to predictable UV output for normal flow and peak flow on different water temperatures
  • No extra wires required for PPT operation (four lamp wires only)

PPT-Set = amalgam lamp + ZED ballast + quartz sleeve

 

Introduction

The UV-output of low-pressure amalgam UV-lamps is strongly dependent on temperature conditions. Small changes of ambient temperature could result in a significant drop of UV-output. The same effect can be noted when a lamp is operated in dimmed mode. Since the lamp dissipates less heat if operated with less power, dimming the lamp is changing its temperature – thus significant variations in UV-output might occur. These variations may be even greater the more the ambient temperature is changing.

Comparison

Original Lamp

Figure 1 shows the average UV output over several water temperatures on a typical amalgam lamp.

PPT Lamp

The appropriate characteristics of the PPT lamp are shown in figure 3 and 4. The UV output is uniformly stable irrespective of water temperature and electrical power.

The actual temporal UV profile of this lamp at different water temperatures is shown in figure 2. Point (1) and (2) are indicating a selected UV value at identical lamp current values for different water temperatures. A temperature raise from 10°C to 25°C leads to a UV decrease of 15% for this lamp.

Figure 4 additionally shows the lamp operation with raised lamp current. The UV output remains stable. That means an 20% increase of UV output compared to the original lamp is possible when using the PPT. So the number of UV lamps could be reduced in large facilities.Figure 4 additionally shows the lamp operation with raised lamp current. The UV output remains stable. That means an 20% increase of UV output compared to the original lamp is possible when using the PPT. So the number of UV lamps could be reduced in large facilities.system efficiency​

Conclusion

PPT lamps generate very predictable and stable UV-output values for all dimming levels in a wide range of environmental temperature. Besides that, due to the high stability, higher peak design power can be achieved – resulting in a higher UV-output. Besides stable and predictable UV-output, using PPT lamps may save energy and hardware equipment.