RBRcoda Tu
The RBRcoda Tu (Fig. 8) is a realtime turbidity sensor with two independent optical channels for optimising linearity and sensitivity. Its high dynamic range permits exposure to full sunlight with very low detection limits, while power consumption and depth rating have been tailored for use in a wide variety of applications.
The turbidity channel of the RBRcoda Tu ensures high sensitivity in the low range (0-1000FTU), while the optical backscatter channel is designed for high-turbidity applications (up to 20000FTU). RBR calibrates the optical backscatter channel to ensure the highest accuracy around and above 1000FTU, thus achieving alignment between these two channels through their intended measurement conditions.
All optical components of the RBRcoda Tu are robust and durable, selected to minimise ageing due to UV/sunlight exposure, and thus show no change in properties over extended deployments. Its sapphire windows facilitate automated cleaning by a wiper to keep them free of biofouling during long-term moored deployments.
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When used as a standalone sensor, the RBRcoda Tu has the additional capability to sample in aggregate mode. See Ruskin User Guide: Sensors for details. |
Turbidity
| Parameter | Value |
|---|---|
Channel wavelength |
880nm |
Centroid angle |
90° |
Linearity, R2 |
0.99 |
Initial accuracy |
5% |
Calibrated range1 |
0-1000FTU |
Measurement range1 |
0-1500FTU |
Detection limit |
0.005FTU |
1 Response becomes non-linear above 1000FTU.
Turbidity (optical backscatter)
| Parameter | Value |
|---|---|
Channel wavelength |
880nm |
Centroid angle |
135° |
Linearity, R2 |
0.99 |
Initial accuracy |
5% |
Calibrated range1 |
1000-4000FTU |
Measurement range1 |
0-20000FTU |
Detection limit |
2.0FTU |
1 Response is linear between 500 and 15000FTU.