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ColTechw² Colour Sensor

Self Cleaning Sensor for Apparent Monitoring

The ColTechw² Sensor has been specifically designed to monitor Apparent Colour in applications where a broad indication of the colour of the water is required. The self cleaning sensor is ideal for monitoring at the intake stage of drinking water processing, allowing automatic coagulant control with no need for a complex analyser.

Organic materials such as Humic Acid or metals like Iron and Manganese dissolved in water will appear as an unacceptable yellow tinge. If discoloured water is allowed to enter the water supply network customers will quickly become aware of the problem.

For specialist advice call:

+44 (0)1726 879800

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View Related Product Documents
  • Overview
  • General Specification
  • Measurement Specification
  • Ordering Information & Spare Parts

Measurement of colour is therefore an important element of potable water treatment control, the ColTechw² Sensor in combination with the 7300w² Monitor will provide a reliable, repeatable indication of colour levels allowing online adjustment of coagulation control packages. A high residual colour reading is a clear indicator of a coagulation control system that is not functioning correctly, and will allow the process to be optimised, enabling significant savings to be made in usage of dosing chemicals.

The sensor requires very little maintenance, with no special tools or training required. Calibration can be carried out against either a wet standard or using a reference standard.

Dimensions (hxwxd)440 x 200 x 200 mm
Weight4.5 kg
Protection ClassIP68
Enclosure MaterialBlack Acetal Co-Polymer, Polypropylene
Seal MaterialNitrile
Cable EntryIntegral Cable Glands
Cable Length5 metres standard, 100 metres maximum
Process ConnectionsInlet and Drain: 1/2" BSP with 12 mm hosetail
Outlet: 1/4" BSP with 8 mm hosetail
Interface to Monitor
Power Supply12 VDC from Monitor
Sensor OutputModTechw², RS485
Environmental Data
Operating/Storage Temperature0 to 50ºC
Pressure Rating1 Bar
ServiceWiper and desiccant replacement every year (application dependent)
CalibrationThe sensor is inherently stable, calibration should be carried out to suit the application. Our recommendation is every 6 months.
Measurement Characteristics
Principal of OperationLight Attenuation
Blue LED Light Source - 370 nm
Turbidity Limit400 NTU
Optical Path Length40 mm
AccuracyBetter than +/-2% of reading on real sample
ResolutionDependent on range setting, typically +/-2% of reading
Display Resolutionsee 7300w² Monitor
Response Time90% of step change in 2 minutes at 1 litre/min
Flowrate0.5 to 5 litres/minute
UnitsUser Selectable °H, PtCo, CU
Range0-200 °Hazen
Part NumberDescription
223911ColTechw² Sensor (Range 0-200 Hazen, Cable Length: 5 metres, Nitrile Wiper)
220372De-Bubbler with Auto Air Vent
Service Pack
201010WaterWatch2310/WaterWatch2970.TurbiTechw² LR/ColTechw² - Replacement Cleaner Arm/Wiper Blades (pack of 3)

7300w2 Monitor

7300w² Monitor

The core product in the WaterWatch² range - the 7300w² Monitor provides all the user interface and system configuration

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De-Bubbler for TurbiTechw² LR and ColTechw² Sensors

De-Bubbler for use with TurbiTechw² LR and ColTechw² Sensors

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To speak with one of our specialist advisors, call +44 (0)1726 879800
or complete our Online Enquiry