UviLux Sensor: Enables real-time detection of aromatic hydrocarbons (PAH), CDOM, Tryptophan-like fluorescence, BOD or Optical Brighteners

UviLux Sensor - enables real-time detection of aromatic hydrocarbons (PAH), CDOM, Tryptophan-like fluorescence, BOD or Optical Brighteners CTG's UviLux sensor provides highly sensitive data on a wide variety of UV fluorescence parameters including Polycyclic Aromatic Hydrocarbons (PAH), CDOM, Tryptophan-like fluorescence (TLF), BOD and Optical Brightening Agents (OBA). The robust submersible housing and electronics provides the platform from which these different parameters can be measured via factory‑set configuration of the fluorometer optics.

 

UV Fluorometer for:  

  • Pollution surveillance & investigative monitoring
  • Point source pollution tracking
  • Pollution monitoring in ports and coastal areas
  • Road and airport apron run-off monitoring
  • Pollution ingress into infrastructure

 

CE

 

Applications

  • Pollution surveillance & investigative monitoring
  • Point source pollution tracking
  • Pollution monitoring in ports and coastal areas
  • Road and airport apron run-off monitoring
  • Pollution ingress into infrastructure

Features

  • High sensitivity
  • High ambient light rejection
  • Flexible data connectivity
  • Excellent turbidity rejection
  • Wide voltage input range
  • Low power consumption
  • 1000 metres depth capability
  • Flexible deployments with range of accessories
  • Data validation provided

Introduction

CTG's UviLux sensor provides highly sensitive data on a wide variety of UV fluorescence parameters including Polycyclic Aromatic Hydrocarbons (PAH), CDOM, Tryptophan-like fluorescence (TLF), BOD and Optical Brightening Agents (OBA). The robust submersible housing and electronics provides the platform from which these different parameters can be measured via factory‑set configuration of the fluorometer optics.  UviLux fluorometers can be deployed individually, or combined in pairs to provide increased robustness to variable fluorescence backgrounds when required. CTG recommend pairing the CDOM PAH with either the UviLux PAH or PAH and pairing the standard UviLux CDOM with the Tryptophan UviLux in these circumstances.

 

The UviLux sensor provides a wide variety of both digital and analogue data options, for most configurations both are available. The UviLux is compatible with a wide range of input voltages. This results in truly flexible connectivity which makes the UviLux compatible with many of today’s instrumentation platforms and vehicles.

How does it work?

UviLux detects UV fluorescence. When some dissolved aromatic compounds absorb UV light they may re-emit a fraction of this energy as fluorescence at longer wavelengths. Fluorescence intensity is directly proportional to concentration. The technique is widely recognised as one of the most sensitive detection methods available.

 

UviLux sensors use a stabilised UV LED light source and photomultiplier detector to provide exceptional measurementsensitivities. By exciting fluorescence at deep UV wavelengths, the UviLux sensors can detect a wide range of UV fluorescence compounds at the parts-per-trillion level. Sophisticated electronic signal processing, combined with cowl design principles employed in ourUV AquaTracka, enables the UviLux to operate successfully in high levels of ambient light. The high quality optical filtration used in both the excitation and emission optical paths gives excellent turbidity rejection.

UviLux graph

Configuration

UviLux is part of the Lux range of CTG sensors, which all share common accessories for ease of deployment in a wide variety of applications. These accessories include the Hawk handheld display and logging unit for portable systems, and the Watchkeeper wall mounted data display and logger, for permanent installations.

The Lux USB Dongle and TPlot8 software are also available for connection directly to a PC.For flow‑through applications flow‑through manifolds are available. When connection is required to third party equipment the UviLux can be supplied with suitable cable.

Specification

The sensitivity and calibrated range of each UviLux 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), here 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.

 

Parameter

PAH fuel

PAH

CDOM (crude)

Tryptophan CDOM Optical brightener
Sensitivity (QSU) 0.06 0.03 0.01 0.08
Calibrated range (QSU) 600 600 600 1200
Example compound: sensitivity – range (ppb)

BTEX*:

3.0 –50,000

NDSA**:

0.40 –6,500

Carbazole:

0.005 –80

Phenanthrene:

0.010 –150

Perylene:

0.003–50

Tryptophan:

0.02 –1200

BOD:

0.001 - 50mg/L

PTSA:***

0.02–900

PTSA:***

0.19–2,400

*BTEX is Benzene, Toluene, Ethylbenzene, p‑Xylene, m‑Xylene, o‑Xylene at equal ppb concentrations
**NDSA is naphthalene disulphonic acid
***PTSA is pyrene tetrasulphonic acid

 

Interfaces Digital Analogue
Standard RS232 0.5 – 5Vdc
Option1 RS232 4 –20mA
Option2 SDI-12 Not available
Option3 RS422 Not available


Input voltage 9 –36V
Depth rating 1000m
Power requirement < 1 watt @12V
Operating temperature -2°C to +40°C
Storage temperature -40°C to +70°C
Size Ø 70mm x149mm
Housing material AcetalC
Weight 800g in air / 150g inwater
Connector Subcon MCBH6M
Detector gain Fixed (factory set) or auto (selectable)
Analogue modes Linear or Logarithmic
Data validation Data validation flags provided

In view of our continual improvement, the designs and specifications of our products may vary from those described.