UV254 Analyzer – UV254Sense
The UV254Sense UVA/UVT monitor provides real time organic UVA (ultra-violet absorbance) and UVT (ultra-violet transmission) analysis. The real time monitoring of organics in water has improved greatly with technological improvements in spectral analysis of the ultraviolet light range using the UV254 analyzer which as standard comes with UV transmittance and UV absorbance outputs. It does this by passing a low flow of water continuously through a fixed silica cuvette and by shining a UV254 light through the water measuring how much is absorbed (UVA) and how much is transmitted (UVT).
The concentration of contaminants such as the organics that lead to disinfection by products (DBPs) can be determined by measuring the light absorbed by a water sample at a particular wavelength (254nm). The absorbance of light used in UV254 monitors provides an indication of the amount of aromatic (or reactive) organic matter in water, making it an excellent choice as a surrogate measurement for total organic carbon (TOC) in monitoring organics removal from a process.
UV254 analyzers from Pi allow for the detection of natural organic matter (NOM) which is found in all waters and has a bias towards aromatic compounds which provides significant benefit for monitoring DBP formation potential.
| Document | Type | Size |
|---|---|---|
| UV254Sense – Water | Brochure | 652kB |
| UV254Sense – Waste | Brochure | 696kB |
| UV254 Portable | Brochure | 486kB |
| UV254 Sample Strainer Unit | Technical Note | 655kB |
| Laboratory Based and Portable Analyzers | Technical Note | 608kB |
| Correlating the UV254 Water Quality Parameters to Other Organics Parameters | Technical Note | 666kB |
| Importance of Measuring UV Transmittance (UVT) for UV Disinfection | Technical Note | 445kB |
| Benefits of UV Transmittance (UVT) Field Testing for Selling and Servicing UV Disinfection Systems | Technical Note | 459kB |
UVT Analyzer FAQs
What is UV254?
UV254 refers to the particular wavelength of light (254nm) that is shone through water. Contaminants (that may be either particulate matter or organics) in the water absorb light at that wavelength, and this is the basis of measurement.
How is UV254 measured in water treatment?
This technology is employed in two main ways, ultraviolet absorption (UVA) and ultraviolet transmission (UVT). The UV254Sense can be used in either of these modes.
UVA measures how much of the light is absorbed and is used for measuring the level of organics; it can also be used as a surrogate measurement for COD, TOC and DOC. Water treatment works, and sites using coagulation control commonly use this measurement.
UVT measures how much light passes through the water and is used to determine the power required in UV-based disinfection processes.
How are UVA and UVT connected?
Because UVA and UVT are different ways of interpreting how the same UV254 source is affected by the sample, there is a direct mathematical relationship between them:
How are UV254 and Color connected?
Do particulates in the water have an effect on the measurement?
Can I use UV254 as a surrogate measurement for other parameters, such as TOC?
Continuously measuring total organic carbon (TOC) is both expensive and difficult, and so a common alternative is to use UV254 as a surrogate measurement. Because every water source is different, a correlation needs to be determined for each site; this relationship can then be entered into the analyzer, and a continual surrogate TOC output can be produced.
The quality of this correlation will depend upon the makeup of the TOC in the water; the higher the proportion of UV254 absorbing organics, the better the correlation will be. The opposite is also true, as non-absorbing organics will not be detected by the sensor. However, we typically find that the correlations in wastewater and municipal applications are very good.
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