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UV Transmittance (UVT)
Popular ProductsSensorex UV Transmittance Best Sellers
UVT-LED-SW – UV Transmittance Monitor, Online
The UVT-LED-SW Online UV Transmittance Sensor provides reliable UVT measurements for UV disinfection optimization. Ideal for continuous monitoring of open…
LPM100 – Display, Loop-Powered 4-20mA
The LPM100 is a durable, loop-powered 4-20mA display for use in process monitoring applications. Compatible with any sensor with a 4-20mA output,…
UVT-LED-H Handheld UV Transmittance Monitor
Our UVT-LED-H Portable UV Transmittance Monitor is ergonomic, lightweight, and simple to use. Obtain incredibly accurate UV Transmittance data on water…
What is UV Transmittance (UVT)?
UV Transmittance, also known as ultra violet transmittance, refers to the percentage of light that passes through a water sample at the wavelength of 254 nm. UVT relates to the organics, colloidal solids, and suspended particles that absorb and scatter this UV light wavelength. The amount of UV light absorbed by the sample is known as the UV Absorbance (expressed as A254). Absorbance and transmittance are relevant by this logarithmic function A = log 10 (1/T).
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Why is UVT Measurement Necessary?
The measurement provides valuable insight to the suspended solids and organics content in the water sample, and is a parameter used in the dose calculation for UV disinfection systems.
How is UVT Transmittance Measured?
Ultraviolet (UV) light, at the wavelength of 254 nm, is passed through a path of a 1cm water sample. Compared to a light intensity being measured in pure water and displaying a percentage, the intensity of the light is measured beside a photodiode.

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In addition to UVT sensors we have a full range of water quality sensors.
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