Optical Brighteners &/or Tryptophan Monitoring (Cross-Check)


Cross-Check & Cross-Check Pro - to detect foul water contamination in surface water drains & track source of misconnection


Chelsea Technologies Group’s Cross-Check and Cross-Check Pro systems allow surveyors and regulators to detect foul water contamination in surface water drains and track the source of the misconnection. This is achieved using UV fluorescence to detect either Tryptophan, which correlates with faecal contamination, and/or Optical Brighteners associated with household detergents.

Cross-Check comprises a CTG UviLux fluorometer and a Hawk handheld display and logging unit. The UviLux fluorometer can be factory-configured for either Tryptophan or Optical Brightener detection. CTG’s UviLux fluorometers detect UV fluorescence with industry-leading sensitivity and selectivity and have been optimised for minimal interference from water turbidity.

What is a misconnection?
Check out this clever little video from Thames Water


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