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.
- UVA (ultra-violet absorbance) is an excellent surrogate parameter for TOC, DOC, COD and color.
- UVT (ultra-violet transmission) allows for the calculation of optimal UV dose for disinfection systems, improving efficiency.
- Accurate detection without the cost of reagents.
- Few ongoing service or maintenance requirements.
- Allows feed forward optimization of coagulation control, resulting in decreases in chemical consumption, reduction in sludge removal costs and minimization of DBP formation potential.
- Strong ROI with pay back on the analyzer being seen by many customers within a few months.
- UVA measurement ensures performance of various contaminant removal technologies such as membranes (RO, NF, UF), ion exchange (nitrates and TOC removal) and granular activated carbon (GAC).
- Real time UVA analyzers can provide a final check of effluent water quality and can alarm an operator in case of non-compliance.
- A UVA monitor can monitor the percentage removal of organics across any treatment system.
- Can be combined with a CRONOS® or CRIUS®4.0 for a multi-parameter UV254 analyzer solution that suits your needs.
Standard Features
- Online continuous operation
- Patent pending Ortho-Beam technology
- 254nm wavelength UV light source
- Displays UV transmittance or absorbance values
- UVT (ultra-violet transmission) – The primary application for UV transmission monitoring is to control the intensity of UV light output on UV disinfection processes.
- UVA – The primary application for UV absorbance monitoring is in the optimization of water treatment process by, for example controlling coagulant dose or by providing a surrogate measurement for measurands such as TOC or COD.
- Process control – Direct measurement of a parameter to control a process such as coagulation, UV disinfection and membranes.
- Specific parameter correlation – Correlated to another parameter that is impractical or expensive to measure in real time such as TOC, BOD and COD.
- Event monitoring – Used to monitor baseline absorbance which can trigger an alarm when an absorbance event occurs such as security monitoring for contamination events in a municipal installation.
- Industrial water and wastewater secondary and effluent monitoring, to determine treatment efficiency after secondary treatment and provide tertiary treatment monitoring and control.
- Automatic chemical cleaning system
- Dual sample feed capability
- Multiple sensors on a single analyzer
Focus Ons are a series of short articles distributed by email providing technical information regarding instrumentation, process measurement in potable, waste, process and pool waters. If you would like to join the mailing list, please contact us.
>> Coagulation Control During Periods When Plants Are Unmanned
>> Coagulation Control During Periods When Plants Are Unmanned
>> Coagulant Dose Determination in 5 Minutes!
>> Correlating the UV254 Water Quality Parameter to Other Organics Parameters
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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