UV254 – Pi UV254Sense

Pi UV254Sense analyzers 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.

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), Chemical Oxygen Demand (COD) in monitoring organics removal from a process.


  • 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.
  • Patented Pending Ortho-Beam Technology


  • UVT– 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 such as TOC or COD.
  • Process Control– Direct measurement of a parameter to control a process such is coagulationUV disinfection and membranes.
  • Specific Parameter Correlation– Correlated to another parameter that is impractical or expensive to measure in real time such as TOCBOD 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 andeffluent monitoring, to determine treatment efficiency after secondary treatment and provide tertiary treatment monitoring and control.
  • Post Activated Carbon Monitoring

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