Turbidity
IDT Integrated Digital Turbidity Sensor
Turbidity
Integrated digital turbidity sensor using infrared scattering — self-cleaning option and digital Modbus networking for unattended monitoring points.
- Infrared 90° / 135° scattering with automatic compensation
- Digital RS485 Modbus output — long cable runs without signal loss
- Optional brush self-cleaning for maintenance-free operation
- IP68 submersible 316L design
Overview
A turbidity sensor measures the cloudiness of water caused by suspended particles — a key indicator of filtration performance, treatment efficiency and discharge quality.
The IDT Integrated Digital Turbidity Sensor operates on the principle that infrared light emitted by the light source undergoes absorption, reflection and scattering when it passes through a sample. Within a certain range, the intensity of the scattered light is proportional to the turbidity or suspended solids concentration. The IDT utilizes two sets of photodetectors at 135° and 90° angles to capture scattered light and calculates the turbidity or suspended solids concentration by analyzing the intensity of these signals.
Typical Applications
Features
- Multi-beam measurement with mutual compensation; manual range switching supported
- Modulated light source and optical bandpass filtering effectively eliminate ambient light interference
- Innovative optical path design enables compact installation and higher measurement accuracy
- Automatic compensation for light source and temperature ensures stable, drift-free readings and longer calibration intervals
- Compatible with automatic cleaning brush system for low-maintenance operation
Specifications
| Parameter | Specification |
|---|---|
| Measurement Method | Light scattering method |
| Measuring Range | 0–4000 NTU |
| Accuracy | ±3%; error ≤ 1 NTU when turbidity < 20 NTU |
| Repeatability | ±2% |
| Response Time | ≤ 60 s |
| Zero Drift | ±3% |
| Temperature Range | 0–50 °C (non-freezing) |
| Protection Rating | IP68 |
| Operating Pressure | 0–6 bar |
| Communication Interface | RS485 interface, Modbus RTU protocol |
| Power Supply | 9–28 VDC |
| Power Consumption | 0.5 W |
| Dimensions | Φ40.5 × 240 mm |
| Material | 316L stainless steel |
Frequently Asked Questions
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