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UV Transmissibility (UVT)

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UV Transmittance

Perhaps the most overlooked, yet most critical UV performance factor when assessing an application’s UV requirement/demand, is the water’s “UV Transmittance” which is expressed in percent (0-100%). %UVT is the measured value between a known UV light source (@ 254 nm) and what is measured by a calibrated detector through a 1 cm thick sample of the water to be treated. The measured value (%UVT) is expressed as the total amount of UV light energy available to treat the water. The higher the % value the greater the UV dose will be. UV light that is absorbed by substances in the water is unavailable to inactivate microorganisms. When more UV light is absorbed (i.e. low %UVT), greater UV capacity will be required to compensate for the loss due to absorption. Specifying UV equipment properly can not legitimately take place without first identifying the %UVT.



The following charts demonstrate how a lower %UVT parallels a diminished UV dose when operating our model CLP6780-A8 (3-260 Watt Amalgam UV Lamps) at a flow rate of 150 GPM. Notice the distinct drop in UV dose when considering a slightly lower %UVT.

Percent UV Transmissibility Loss Chart%UVT and UV Dose Chart

Other Ultraviolet Sterilizer Factors to consider:

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