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  5. Partech - Model ColTechw² - Self ...

Partech - Model ColTechw² -Self Cleaning Colour Sensor for Apparent Monitoring

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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

Maintenance :

  • 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.
  • 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