Description
UV Transmittance Monitor
Features
- Optimise Dosing Efficiency of UV Disinfection
- Automatic Cleaning & Calibration
- Simple Connectivity with Direct 4-20mA Output
- Convenient Small Footprint Design
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CODE |
|---|---|
| Inline Process UV Transmittance Monitor |
UVT-LED-PW |
| Submersible UV Transmittance Monitor |
UVT-LED-SW |
Overview: UVT
What is UV Transmittance (UVT)?
UV Transmittance refers to the percentage of light at the wavelength of 254 nm that passes through a sample of water. UVT relates to the organics, colloidal solids, and suspended particles that absorb and scatter this wavelength of UV light. The amount of UV light absorbed by the sample is known as UV Absorbance (expressed as A254). Absorbance and transmittance are related by a logarithmic function A = log10 (1/T).
How is UVT Measured?
Ultraviolet (UV) light at the wavelength of 254 nm is passed through a 1 cm path of the water sample. The intensity of the light is measured with a photodiode, compared to the light intensity measured in pure water, and displayed as a percentage.
Why is UVT Measurement Necessary?
UV Transmittance measurements provide valuable information related to the amount of natural organic matter (NOM) in the water sample. Data characterising the organics content of the sample water can be used to control and optimise water and wastewater treatment processes. Commonly, UVT measurements are used to optimise energy efficiency of and ensure adequate dosing by the UV disinfection system. UV dose is dependent on UV light intensity, contact time (controlled by flow rate), and UVT. Most UV disinfection systems are programmed for a 4-20 mA input of UVT to modulate lamp intensity for the system meets dosing requirements.
