Partech Products ColTechw² Apparent Colour Sensor
ColTechw² Sensor
Sensor for Apparent Colour 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. Organic
materials such as Humic Acid or 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.
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, by making adjustments significant savings can 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.
Technical Specification
Physical
| Dimensions | 370 mm x 280 mm x 200 mm (HxWxD) |
| Weight | 4.5 kg |
| Enclosure Rating | IP68 |
| Material of Construction | Black Acetal Co-Polymer, Polypropylene |
| Seal Material | Nitrile |
| Cable Entries | Integral Cable Gland |
| Cable Type | 4 core, 2 Twisted Pair, 5mm O/D Polyurethane Coated |
| Cable Length | 10 metres standard, 100 metres maximum |
| Process Connections | Inlet and Bypass: 1/2" BSP with 12 mm hosetail |
| Outlet: 1/4" BSP with 8 mm hosetail |
| Service Requirement | Automatic Self Cleaning |
| | Wiper and Dessicant Replacement yearly (application dependent) |
Environmental Data
| Operating Temperature | 0 - 50ºC |
| Storage Temperature | -20 to 60ºC |
| Location | Indoor |
Interface to Monitor
| Sensor Output | RS485 |
| Power | 12 VDC from Monitor |
Measurement Principal
| Principal of Operation | Light Attnuation |
| | Blue LED Lght Source |
| | 370nm |
| Turbidity Limit | 100 NTU |
| Optical Path Length | 40 mm |
Measurement Characteristics
| Accuracy | Better than +/- 2% FSD on real sample |
| Resolution | Dependent on range setting, typcially +/- 2% |
| Repeatability | Better than +/- 1% FSD on real sample |
| Response Time | 90% of step change in 2 minutes at 1 l/min |
| Flowrate | 0.5 to 5 l/minute |
| Low Range | 0 - 200 ºHazen |
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