UV254 Analyser – UV254Sense Probe
The UV254Sense Probe UV254 analyser provides real time online 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 analyser probe which as standard comes with UV transmittance and UV absorbance outputs. It does this by passing a low flow of water continuously through a gap in a probe and by shining a UV254 light through the water, measuring how much light 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 analysers 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 analysers from Pi allow for the detection of natural organic matter (NOM) which is found in all waters. UV254 absorption has a bias towards aromatic compounds which provides significant benefits for monitoring DBP formation potential.
Principle of Operation
The UV254Sense Probe UV254 analyser from Pi uses a high quality, long life 254nm wavelength UV LED source. It shines this light through a sapphire window and the water sample picks up the light at the other side in a photodiode detector. The amount of light that is ‘lost’ to absorbance in the water is the UVA, and the amount of UV light that gets through is the UVT. The correlation between the two is governed by Beer-Lamberts law.
Cost of Ownership
The cost of calibrating and maintaining the UV254Sense Probe UV254 analyser is extremely low as there are no reagents or moving parts. Maintenance is simply cleaning and occasionally ‘zeroing’ the analyser with DI or RO water. With the addition of automatic cleaning systems, the maintenance cost of the UV254 analyser is minimal. Coupled with a low purchase cost, the total cost of ownership of the UV254 analyser is extremely low in comparison to other UV254 instruments.
Key Benefits
- UVA (ultra-violet absorbance) is an excellent surrogate parameter for TOC, DOC, COD and colour.
- 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 – no moving parts.
- Allows feed forward optimisation of coagulation control, resulting in decreases in chemical consumption, reduction in sludge removal costs and minimisation of DBP formation potential.
- Strong ROI with pay back on the UV254 analyser 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 analysers 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 analyser solution that suits your needs.
Standard Features
- Online continuous operation
- 254nm wavelength UV light source
- Displays UV transmittance or absorbance values
Optional Features
- Self-cleaning
- Process Controls
- Remote access
Applications
Options
FAQs
Focus On
Downloads
The UV254 analyser has many applications including:
- 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 (ultra-violet absorbance) – the primary application for UV absorbance monitoring is in the optimisation 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 – the UV254 analyser correlates 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.
…UV254 analysers are a fantastic surrogate for TOC analysers at a fraction of the cost to buy and own?
Coagulation dose is in large part dependent on pH, turbidity, temperature, alkalinity and organics loading. Depending on water chemistry, for many plants the largest determining factor is the organics load and a feed forward control based on organics loading, or UV254 absorbance, provides a robust coagulation control system that can be further enhanced with feedback from a “Pi is a great company to work with. Their customer support is excellent and I wouldn’t want to use anyone else for our instrumentation requirements”
Ian Tanner
Diversey, ( A Solenis Company)
"We at Scottish Water have been using the excellent Pi LabSense 3 and portable UV254 instruments in the field for optimizing our Water Treatment processes for some years now. We find them easy to use and invaluable for detecting and resolving issues in a timely, efficient and effective manner. Two great pieces of kit!”
Paul Weir
Scottish Water - UK
"I want to thank you and all at Process Instruments for all the assistance, information and handholding during the year. The help that was so freely given was very much appreciated. Can you please extend my appreciation to all at Pi and let me wish you all a happy, safe and wonderful Christmas and I look forward to working with you again in 2021."
Michael Bailey
Wexford Co. Co. - Ireland
"Excellent level of support and always so much more prompt than a lot of our suppliers."
Phill Tuxford
Detectronic - UK
"The plant can’t produce good quality water without the CoagSense."
Mick Murphy
Wexford Co. Co. - Ireland
"We've used the CRIUS® with chlorine, pH and conductivity sensors for several years and confirm quality, performance and reliability has been wholly satisfactory to date."
David Kerr
Karis Technical Services Ltd. - UK
"We in ECM ECO Monitoring can only recommend Process Instruments products and services to all other potential clients. They have very complex portfolio of products for water quality monitoring in various types of industries, friendly attitude, very quick delivery time and prompt reaction to all our needs and inquires. Our clients especially appreciate the particle counters and sizers allowing identification of drinking water treatment problems. The Streaming Current Monitors are a great tool for optimisation of expensive chemicals.”
Branislav
ECM ECO Monitoring - Slovakia
"Simply the best turbidity available."
John Clark
Chemtrac - Atlanta, GA
"In 2019, we purchased 29 particle counters which were installed in our water plants. So far, their performance has been perfect."
Li Yongjun
Jinan Hongquan Water Company - China
"We have installed hundreds of ozone analyzers from Pi over the years. They are just accurate, reliable and require low maintenance."
Jiao Tumei
Qingdao Guolin Environmental Technology Co., Ltd., - China
"Over the last few years we've purchased chlorine and turbidity analyzers from Chemtrac and with routine calibration the probes measure the chlorine and turbidity without any issue. We are very happy with this product and would highly recommend them."
Daniel "Buck" Owen
Ocoee Utility District - Ocoee TN
"We've been using these analyzers since 2008. They're easy to use and very stable. Calibration and maintenance is quick and simple."
Lloyd Gruginski
Chehalis WTP - Chehalis, WA
"The Pi products provide excellent value for money and represent the best municipal drinking water analyzers available."
John Clark
Chemtrac - Atlanta
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Clovis Tuchapski
Buckman - Latin America
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Ibrahim Kaplin
Thermomed - Turkey
"Going from ORP control to amperometric chlorine sensor control has undoubtedly improved the pool water immensely!"
Chris Tedeschi
Link Automation - USA
"The Streaming Current Monitor from Pi is the best SCM I have ever used. The analyser responds quickly and has many powerful functions, which helps me save a lot of money."
Ye Yancong
Xiamen Xishan Water Plant - China
“Process Instruments has a broad range of high quality and user-friendly solutions for water-industry problems. The short lead times and great customer support make Pi a reliable partner.”
Péter Szabó
SC KATALIN NOHSE CHIMIST IMPORT SRL - Romania
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Iñaki Seisdedos Rodríguez
Izasa Scientific - Spain
"The support from Pi and its partners is superb. They go above and beyond to ensure that, not only is their equipment perfect but that the process is working great too. Five Stars!"
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Equip Solutions - Illinois, USA
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Rudi Tuffek
Allpronix - South Africa
Mukhtar Patel
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