
The TriOS LISA UV sensor from PMA delivers precise and reliable measurements of UV254 absorption and %UVT, using cutting-edge UV-LED technology for real-time water quality monitoring. Its robust design and flexible installation options make it ideal for various environmental, industrial, and municipal applications.
Monitor UV254 absorption and %UVT with the TriOS LISA UV sensor. Designed for accurate water quality monitoring, the LISA UV combines advanced UV-LED technology, automatic turbidity compensation, and robust construction. It is ideal for wastewater treatment, drinking water safety, and environmental assessments.
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Find out more about the Lisa UV sensor by downloading our comprehensive datasheet. This detailed document provides in-depth information on specifications, features, and applications, empowering you to make informed decisions for your water quality monitoring needs.




Energy-Efficient UV-LED Technology: Utilizes long-lasting UV-LEDs, ensuring a prolonged operational life and reduced energy consumption.
Robust and Durable Design: The sensor is constructed with high-quality materials and is designed to withstand challenging environmental conditions, ensuring reliable performance over time.
Nano-Coated Windows with Compressed Air Flushing: This feature features unique nano-coated windows combined with compressed air flushing, which minimizes fouling and reduces maintenance requirements.
Automatic Turbidity Compensation: Equipped with a secondary measuring channel to automatically compensate for turbidity, enhancing measurement accuracy in various water conditions.
Flexible Optical Path Lengths: This product offers adaptable optical path lengths through various lens sockets, allowing customization to specific application needs.
Seamless Integration and User-Friendly Interface: The TriOS G2 interface enables quick and easy integration into existing process control systems or external data loggers. Configuration is accessible via any standard web browser on a PC, tablet, or smartphone.
Sewage Treatment Plants: Provides real-time monitoring of organic loads, optimising treatment processes.
Environmental Monitoring: Assesses natural water bodies for pollution levels and overall water quality, facilitating timely environmental assessments.
UV-Disinfection Systems: Monitors UV transmittance to verify the effectiveness of disinfection processes and ensure compliance with health standards.
Drinking Water: Monitors UV254 absorption to ensure the safety and quality of potable water and aid in detecting organic contaminants.
SAC254 (Spectral Absorption Coefficient at 254 nm): Indicates the presence of organic compounds in water.
CODeq (Chemical Oxygen Demand Equivalent): Estimates the oxygen required to oxidize organic matter.
BODeq (Biochemical Oxygen Demand Equivalent): Estimates the amount of oxygen microorganisms consume during the decomposition of organic matter.
TOCeq (Total Organic Carbon Equivalent): Measures the total amount of carbon in organic compounds in water.
UVT254 (UV Transmittance at 254 nm): Assesses the percentage of UV light transmitted through the water, indicating water clarity and quality.
Turbidity (as Formazin Attenuation Units - FAU): Measures the cloudiness or haziness of water caused by suspended particles.

The TriOS LISA UV sensor is an advanced UV254 absorption photometer for precise water quality monitoring. Utilizing innovative UV-LED technology, it offers long-lasting performance and energy efficiency. The sensor's robust design includes nano-coated windows with compressed air flushing, minimizing maintenance by preventing fouling. Its flexible optical path lengths and automatic turbidity compensation ensure accurate real-time measurements without reagents. The LISA UV seamlessly integrates into existing process control systems via the TriOS G2 interface, allowing for easy configuration through standard web browsers on PCs, tablets, or smartphones.
Monitoring UV254 absorbance is crucial in water treatment processes as it provides a rapid assessment of organic matter, particularly aromatic compounds, present in the water. These compounds can react with disinfectants like chlorine to form potentially harmful disinfection by-products (DBPs). By measuring UV254, operators can evaluate the concentration of these organics, enabling optimization of treatment processes to reduce DBP formation and ensure water safety.
With over 50 years of experience in process analysis, PMA Ltd. has established itself as a leader in providing innovative solutions for the water, oil, and power industries. Our extensive expertise ensures we deliver reliable and accurate monitoring systems tailored to meet our client's needs. Partnering with TriOS, we offer state-of-the-art instruments like the LISA UV sensor, providing our clients with cutting-edge technology and unparalleled support for their water quality monitoring requirements.
Our team of dedicated field support group technicians are vastly experienced in applications and installations. We therefore appreciate and understand how analysers work, why they were installed and what data they typically ought to produce.
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Established in 1971 PMA is a well-recognised and award winning provider of online instrumentation for process control and compliance monitoring. With expertise in analytical techniques such as Photometry, Colorimetry, Ion-selective electrodes (ISEs), Titration, Fluorescence, Ultrasonics and more.



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