CDOM-Station and CDOM-Station Pro for real-time assessment of fluorescent dissolved organic matter

CDOM-Station and CDOM-Station Pro – for  real-time assessment of fluorescent dissolved organic matterChelsea Technologies Group's CDOM-Station and CDOM-Station Pro systems allow utility operation managers, process scientists and engineers to assess real-time levels of coloured dissolved organic matter (CDOM) in water systems. This is achieved by detecting UV CDOM fluorescence, which has been shown to correlate with organic levels in a wide variety of water environments, providing significantly enhanced improvements in sensitivity over conventional absorbance methods.

 

The CDOM-Station comprises a CTG UviLux fluorometer and a Watchkeeper wall mounted data display and logger. CTG’s UviLux fluorometers detect UV fluorescence with industry-leading sensitivity and selectivity and have been optimised for minimal interference from water turbidity.

 

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Applications

  • Managing disinfection by-product formation potential
  • Assessing organic load through works
  • Filter management
  • Coagulation Control
  • Monitoring THM and HAA precursors

Features

  • Real-time indication of CDOM levels
  • Automated data logging (2Gbyte storage capacity)
  • 4 – 20mA output for data export in real-time
  • Relay for audible alarm or control valves
  • In-line flow-through operation with standard pipefittings
  • High sensitivity

Introduction

CTG’s CDOM-Station and CDOM-Station Pro systems allow utility operation managers, process scientists and engineers to assess real-time levels of coloured dissolved organic matter (CDOM) in water systems. This is achieved by detecting UV CDOM fluorescence, which has been shown to correlate with organic levels in a wide variety of water environments, providing significantly enhanced improvements in sensitivity over conventional absorbance methods.

 

The CDOM-Station comprises a CTG UviLux fluorometer and a Watchkeeper wall mounted data display and logger. CTG’s UviLux fluorometers detect UV fluorescence with industry-leading sensitivity and selectivity and have been optimised for minimal interference from water turbidity.   Data is displayed on the Watchkeeper’s colour touchscreen and is logged internally. Up to three 4 - 20mA outputs are provided for data transmission.

 

What is the difference between the CDOM-Station & CDOM-Station Pro

  • The CDOM-Station comprises a single CTG UviLux CDOM fluorometer and a Watchkeeper wall mounted data display and logger.
  • The CDOM-Station Pro includes an additional UviLux sensor, configured for detecting Tryptophan-like fluorescence. The second sensor provides additional sample information regarding potential bacterial contamination.  

How does it work?

CTG’s CDOM-Station and CDOM-Station Pro detect UV fluorescence from Dissolved Organic Matter (DOM).  These compounds absorb UV light and 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.

 

CDOM may originate from terrestrial or riverine sources and fluoresces in the blue region when excited with UV light.  Only aromatic ring compounds can be detected by fluorescence, with emission wavelengths generally increasing with the size of the ring compounds.  CTG excite at short UV wavelengths enabling highly sensitive detection of aromatic compounds. 

CDOMgraph

 Fluorescence map of CDOM  from a Reservoir sample,
indicating CDOM-Station measurement window

 

CDOMgraph2

CDOM Levels through a Water Treatment Works



 

Configuration

The CDOM-Station and CDOM- Station Pro have been designed for both indoor and outdoor operation, with the UviLux fluorometers either fitted within a water trough or mounted in flow-through manifolds for in-line operation. A single cable connects the UviLux fluorometers to the Watchkeeper display and logger unit, which is powered from a 24 Vdc supply. Signal inputs are presented on the screen and up to three 4 – 20 mA signals can be accessed for data system networking. Audible alarms or control valves can be fitted and programmed to alert or activate when signals exceed user-set thresholds.  Data is recorded onto a 2 Gbyte memory card. Data can be download via a USB cable, or by removal of the memory card. 

Specification

UviLux Fluoremeter

Size Ø70 x 150mm
Weight 800g
Pressure rating 60 bar 

 

UviLux Performance
  CDOM 
Tryptophan
Sensitivity (QSU) 0.01 0.01
Calibrated range (QSU) 600 600
Example compound: 
sensitivity – range (ppb)
PTSA* 0.02-900 Tryptophan 0.02-1200

*PTSA pyrene tetrasulphonic acid

 

CDOM-Station, single UviLux fluorometer with Flow Manifold

Size Ø130 x 200mm
Weight 2.5kg
Fluid connections Union, 20mm, PN16
Perssure rating 4 bar
Max operating temp. 55ºC

 

CDOM-Station Pro, two UviLuxfluorometerswith FlowManifolds

Size 265 x 200 x 200 mm
Weight 5kg
Fluid connections Union, 20mm, PN16
Pressure rating 4 bar
Max operating temp. 55ºC

 

Watchkeeper display and logger

Display 320 x 240 pixel qVGA backlit LCD
Display Size 70 x 50 mm
Size 200 x 110 x 60 mm
Weight 900 g
Memory capacity 2 Gbyte
IP Rating IP67
Voltage input 24 Vdc
Power

2.8 W @ 24 Vdc
4.6 W @ 24 Vdc (Pro)

Temperature range -20 ºC to 55ºC

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