TURB200 Turbidity Sensor
The turbidity sensor is based on the nephelometric method (ISO 7027 - EN 27027). A light beam from a laser diode is sent to the sample through an optical lens. The light scattered at 90 degrees by the suspended particles is collected by a photodetector and converted into an electrical signal proportional to the turbidity of the sample. The sensor uses 650 nm red laser light or, on request, 860 nm infrared laser light so that the measurement is not affected by the colour of the sample. It is suitable for measuring turbidity in drinking water and aquaculture as well as at the outlet of municipal or industrial wastewater treatment plants. A built-in bubble trap avoids the effect of bubbles on the measurement. The sensor can be easily opened for calibration with formazin solution. A valve at the bottom allows the bottle to be emptied during calibration operations or for manual cleaning. The turbidity sensor must be connected to EL200 controller for display, calibration and transmission of measurements by RS232/RS485 under Modbus protocol.
| Dimension Drawing | TURB200 | Nephelometric turbidity sensor low range |
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| Measurement Method | Nephelometric | |
| Measurement Range | 0 - 100 NTU | |
| Detection Limit | 0.015 NTU | |
| Repeatability | ±0.01 NTU | |
| Accuracy | ±2% or ±0.015 NTU whichever is greater up to 20 NTU, ±5% above 20 NTU | |
| Detector | 90° scattered light detector | |
| Light Source | Visible laser diode (or infrared laser diode on request), lifetime > 5 years | |
| Bubble Trap | Integrated | |
| Capacity | 250 mL | |
| Inlet/Outlet Fittings | 9.6 mm external diameter plastic tubing | |
| Operating Temperature Range | -5 to 60 °C | |
| Working Pressure | Maximum 3 bar at 25°C | |
| Body Material | PVC | |
| Wet Material | PVC, PP, FKM, Quartz | |
| Connection | Screw terminal | |
| Cable Length | 3 meters | |
| Mounting | On wall by 4 screws | |
| Sensor Protection | IP65 |