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EPA UV Standard
Performance Factors
UV
Lamp "Arch" Length
This is the area between a UV
lamp's internal filaments. This is the usable area of
the lamp that emits the UV radiation.
UV
Lamp "UV Output Watts"
All
UV lamps convert input watts (power required to run
the lamp) into usable UV output watts. Low-pressure
UV lamps are the preferred type of UV lamp, they offer
the highest conversion of input power to usable UV watts
out. (approximate 40% conversion between input watts
and UV outputs within the 250-280nm wavelength - see
germicidal action spectrum curve)
UV
Exposure Chamber Design Criteria for Proper Water Flow
Ratings
Optimal
UV lamp utilization requires three factors to be considered.
1.
The UV lamp must be positioned between the Sterilizer's
water inlet & outlet ports. To produce "Plug
Flow" in the lamp chamber.
2.
The area that the water occupies inside of the Sterilizer's
water containment vessel. (This is the difference between
the unit's outer most inside diameter & the outside
diameter of the unit's Quartz Sleeve = usable cross
sectional area).
3.
The UV lamp's UV output watts are within 250-280nm in
UVC watts.
Water
Clarity (UV Transmittance)
Dirty
or green water diminishes UV transmittance considerably,
lowering the effectiveness of the Sterilizer's capability
during these conditions. It is imperative that an absorption
coefficient factor or UV transmittance percentage be
used to compensate for poor water clarity.
Emperor
Aquatics, Inc. has established a Standard "Green
Water" Flow Rate based on a UV exposure rate of
30,000 µWs/cm2 and applies an 90% UV
Transmissibility factor that considers diminished UV
radiation transmittance through green water.
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