Highly sensitive UviLux BTEX fluorometer for detection of the highly refined BTEX group of contaminants (benzene, ethylbenzene, toluene and xylene).

The BTEX group of highly refined hydrocarbons is a serious groundwater contaminant, toxic to humans and the environment.

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Chelsea's deployable pollution detection sensors can detect refined fuels and BTEX contaminants at parts per billion sensitivities, with excellent turbidity and ambient light rejection, making them suitable for pollution detection deployment in open ocean and process waters

UviLux BTEX Overview

UviLux sensors enable real-time, in situ detection of a wide variety of UV fluorescence parameters, including the BTEX group of contaminants (benzene, ethylbenzene, toluene and xylene).

The compact and highly sensitive fluorometers have excellent turbidity rejection and high ambient light rejection, making them suitable for deployment in groundwater monitoring, as well as natural waters to depths of up to 1000m.

UviLux BTEX Features

Key features

  • In-situ, real time monitoring of fuel in water, specifically BTEX compounds
  • Highly sensitive readings to 3 ppb
  • Couple with FDOM sensor to remove environmental interference
  • Easy to integrate with monitoring platforms and systems, or combine with Hawk for on the spot readings and logging
  • Depth rated to 1000m
  • Excellent turbidity rejection and high ambient light rejection
  • Service and support from dedicated technical team


  • Real time monitoring of fuel contamination in rivers and lakes
  • BTEX monitoring in groundwater
  • Assessment of water quality in catchments and natural waters
  • Detection of fuel contamination in process waters


UviLux BTEX Specifications

UviLux BTEX sensor technical specification

Parameters FUEL – BTEX
Sensitivity (QSU) 0.06
Calibrated range (QSU) 600
Example compound:
sensitivity range (ppb)
BTEX*: 3.0 – 50,000

*BTEX is Benzene, Toluene, Ethylbenzene, p-Xylene, m-Xylene, o-Xylene at equal ppb concentrations


Size Ø 70 mm x 149 mm
Weight in air 800 g in air / 150 g in water
Pressure housing Acetal C
Operating temperature -2 °C to + 40 °C
Storage temperature -40 °C to + 70 °C
Depth rating 1000 m
Connector Impulse MCBH6MP


Input voltage 9 – 36 V
Power requirements < 1 Watt @ 12 V

The sensitivity and calibrated range of each UViLux FUEL – BTEX sensor has been standardised by cross-correlating each calibration solution against a certified reference standard of quinine sulphate using a bench-top spectrofluorometer.  Fluorescence is reported in Quinine Sulphate Units (QSU), where 1 QSU is equivalent to the fluorescence intensity recorded from 1 ppb quinine sulphate at an excitation wavelength of 347.5 nm and an emission wavelength of 450 nm. Factors are provided for selected compounds to convert the fluorescence output from QSU to ppb of the compound of interest

UviLux BTEX Downloads


Petrogenic PAHs are present in petroleum and its by-products, widespread due to storage, transport, use, and leakage of crude oil and its products. Whereas the Chelsea Technologies UviLux BTEX sensor is for the detection of highly refined fuels for, typically, inland groundwater studies, FUEL sensor is more for the detection of the leakage of traditional fuels into streams, rivers and ports. For unprocessed fuels at the source (i.e. upstream at source), the Chelsea OIL sensor is most appropriate.

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