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UV treatment is an effective and environmentally-friendly method to disinfect water, surfaces, and air. However, it is of great importance to determine the right dosage and the right transmittance values. We will explain what this means and how to do that.


Another crucial aspect of UV disinfection is the liquid’s transmittance. The UV-C light has to be able to penetrate the liquid to reach the micro organisms, of course, even those far away from the lamp. The less light the liquid absorbs, the better the organisms are reached. With high transmittance, the light can deeply penetrate the liquid. The farther the light penetrates, the higher the emitted UV dosage to the medium.
Transmittance is usually measured over a distance of 10 mm (T10) or 50 mm (T50), and the value is usually shown in percentages.

Transmittance meters

We can all see when a liquid is murky or not, but determining the exact transmittance of a liquid with the naked eye is impossible. It is calculated as the fraction of the original light that passes through the liquid (I/I0). For determining and monitoring transmittance, Van Remmen UV Technology uses and recommends RealTech meters. These transmittance meters are available in portable and online versions.

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