High-accuracy turbidity sensor DAW-TR20-S

Modbus RTURS-4854-20mA

Overview This online turbidity analyzer is engineered for continuous drinking-water quality monitoring using 90° laser scattering (660 nm).
Scattered light from suspended particles is measured and converted to turbidity values via calibration. The unit offers an ultra-low detection limit (0.005 NTU), high precision (±2% or ±0.02 NTU), a circulatory flow-through path, anti-fouling flow channel and integrated de-bubbling for stable, repeatable readings.
IP68 sensor protection, RS-485 Modbus-RTU digital communication and optional 4–20 mA analog output enable integration into SCADA/DCS systems. Operates on DC 9–28 V and within -5 to 45 °C. Recommended sample flow is 500 mL/min (range 100–1000 mL/min).

Industry Applications

• Water treatment plants and process control
• Secondary (building) water supply systems
• Distribution network endpoints (tap water monitoring)
• Direct drinking water facilities and point-of-use monitoring
• Membrane-filtered and RO systems
• Swimming pool and recreational water monitoring
• Surface water monitoring and intake protection
• Any application requiring low-level turbidity detection

Product Features

• Ultra-low detection limit: 0.005 NTU for early contamination detection
• High precision: laser light source and high-precision electronics for stable results
• Stable operation: circulatory flow-through design minimizes measurement drift
• Anti-fouling water path: flow-channel geometry reduces particle adherence
• Integrated de-bubbling: maintains accuracy in aerated or variable-flow conditions
• Industrial interfaces: RS-485 Modbus-RTU and optional 4–20 mA for system integration

Technical Specifications

• Model: DAW-TR20-S
• Measurement principle: 90° laser scattering, 660 nm laser
• Range: 0–1 / 20 / 100 NTU
• Resolution: 0.0001 NTU (<1 NTU) / 0.001 NTU (≥1 NTU)
• Limit of detection: 0.005 NTU
• Accuracy: ±2% or ±0.02 NTU (whichever is greater) using Formazin primary standard at 25 °C
• Sample flow: 100–1000 mL/min (recommended 500 mL/min); recommended flows: membrane-filtered 100–300 mL/min, tap water 300–600 mL/min
• Power supply: DC 9–28 V; Power consumption: 5 W (peak)
• IP rating (sensor): IP68; Mounting: wall-mounted
• Operating temperature: -5 to 45 °C; Storage: -20 to 60 °C; Humidity: 5%–95% RH non-condensing
• Connections: inlet φ6 mm hose; outlet/drain φ10 mm hose
• Digital output: RS-485 Modbus-RTU; optional 4–20 mA
• Dimensions (W×H×D): 174 × 269 × 99 mm; Weight: approx. 1.2 kg
• Note: Product improvements may change specifications; YuanGan reserves the right to modify parameters.