Colour Sensor

Colour SensorColTechw² Colour Sensor

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.

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  • 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 Turbidity standard or using the dry calibration reference cell that is supplied with every sensor. The reference cell provide an extremely easy, repeatable method of checking the performance of the sensor without the cost and inherent errors associated with chemical standards.

  • Physical
    Dimensions (hxwxd) 440 x 200 x 200 mm
    Weight 4.5 kg
    Protection Class IP68
    Enclosure Material Black Acetal Co-Polymer, Polypropylene
    Seal Material Nitrile
    Cable Entry Integral Cable Glands
    Cable Length 5 metres standard, 100 metres maximum
    Process Connections Inlet and Drain: 1/2″ BSP with 12 mm hosetail
    Outlet: 1/4″ BSP with 8 mm hosetail

    Interface to Monitor
    Power Supply 12 VDC from Monitor
    Sensor Output ModTechw², RS485

    Environmental Data
    Operating/Storage Temperature 0 to 50ºC
    Location Indoor/Outdoor
    Pressure Rating 1 Bar
    Service Wiper and desiccant replacement every year (application dependent)
    Calibration The sensor is inherently stable, calibration should be carried out to suit the application. Our recommendation is every 6 months.

  • Measuring Characteristics
    Principal of Operation Light Attenuation
    Blue LED Light Source – 370 nm
    Turbidity Limit 400 NTU
    Optical Path Length 40 mm
    Accuracy Better than +/-2% of reading on real sample
    Resolution Dependent on range setting, typically +/-2% of reading
    Display Resolution see 7300w² Monitor
    Response Time 90% of step change in 2 minutes at 1 litre/min
    Flowrate 0.5 to 5 litres/minute
    Units User Selectable °H, PtCo, CU
    Range 0-200 °Hazen

  • Part Number with Description
    223911 ColTechw² Sensor (Range 0-200 ²Hazen, Cable Length: 5 metres, Nitrile Wiper)
    220372 De-Bubbler with Auto Air Vent
    Service Pack
    201010 WaterWatch2310/WaterWatch2970.TurbiTechw² LR/ColTechw² – Replacement Cleaner Arm/Wiper Blades (pack of 3)

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