MDS-SS90B Turbidity Sensor
MDS-SS90B Turbidity Sensor – Online Laser Turbidimeter for Water Quality Monitoring
-Product Overview-
The MDS-SS90B Turbidity Sensor is a high-performance online turbidimeter designed for continuous monitoring of suspended solids in water. Compliant with ISO 7027 standards, it employs an 860 nm laser light source and measures turbidity by detecting scattered light intensity from particles in the sample. This compact, submersible sensor delivers accurate, real‑time data for a wide range of applications—from drinking water networks to industrial process control.
With a rugged 316L stainless steel housing and IP68 protection, the MDS‑SS90B withstands harsh environments, high water pressure (up to 0.6 MPa / 60 m depth), and outdoor installation. Its innovative slanted optical window reduces air bubble adhesion, minimizing measurement interference and simplifying maintenance. The sensor supports both RS485 (Modbus‑RTU) and optional 4‑20 mA analog output, ensuring easy integration into existing SCADA or PLC systems.
-Key Features & Benefits-
ISO 7027 Compliant Laser Technology – Uses an 860 nm laser source for stable, reproducible turbidity measurements in accordance with international standards.
Wide Measurement Range – 0 ~ 100 NTU with a resolution of 0.001 NTU and a low detection limit of 0.005 NTU, suitable for both low‑turbidity drinking water and higher‑turbidity wastewater.
High Accuracy & Stability – Accuracy of 2% or ±0.05 NTU (whichever is larger), repeatability ≤1%, and minimal zero drift (≤1.5%) ensure reliable long‑term performance.
Flexible Calibration Options – Factory pre‑calibrated; supports single‑point, two‑point (Formazin), or custom 2–6 point calibration to match site‑specific conditions. Factory curve can be restored anytime.
Signal Diagnostics & Traceability – Internal signal processing allows reading of device serial number and real‑time signal strength, facilitating troubleshooting and instrument traceability.
Rugged & Submersible Design – 316L stainless steel housing with IP68 rating, capable of operating under pressure up to 0.6 MPa or water depth up to 60 m. Suitable for immersion, pipeline, or open‑channel installation.
Anti‑Bubble Slanted Window – The angled light window design prevents air bubbles from adhering to the measuring surface, reducing maintenance needs and ensuring consistent measurements.
Easy Maintenance – The optical window and flow channel are easy to disassemble and clean, reducing daily maintenance effort.
Flexible Output – Standard RS485 (Modbus‑RTU) with optional 4‑20 mA analog output for seamless integration into most control systems.
-Technical parameters-
Parameter | Specification | ||||||
Measuring Range | 0 ~ 100 NTU | ||||||
Resolution | 0.001 NTU | ||||||
Lower Detection Limit | 0.005 NTU | ||||||
Zero Drift | ≤ 1.5% | ||||||
Indication Stability | ≤ 1.5% | ||||||
Accuracy | 2% or ±0.05 NTU (whichever is larger); (calibrated with Formazin primary standard solution at 25°C) | ||||||
Repeatability | ≤ 1% (calibrated with Formazin primary standard solution at 25°C) | ||||||
Response Time (T90) | ≤ 120 s | ||||||
Operating Temperature | -5 ~ 45 °C | ||||||
Calibration Method | Pre-calibrated at factory with default calibration curve; single-point calibration, Formazin two-point calibration, custom 2–6 point calibration | ||||||
Operating Pressure | ≤ 0.6 MPa or water depth ≤ 60 m | ||||||
Power Supply | DC 9–28 V | ||||||
Peak Power | 5 W | ||||||
Detection Method | ISO 7027 | ||||||
Light Source | 860 nm laser | ||||||
Ingress Protection Rating | IP68 | ||||||
Dimension | (192±5) mm × Φ(32±1) mm | ||||||
Housing Material | 316L stainless steel | ||||||
Interfaces | RS485 + 4–20 mA analog output | ||||||
-Applications-
The MDS‑SS90B turbidity sensor is ideal for:
Drinking water & tap water networks – Monitor finished water quality and detect any turbidity excursions.
Wastewater treatment plants – Inlet, outlet, and process control monitoring for suspended solids.
Surface water monitoring – Rivers, lakes, and reservoirs – environmental compliance.
Industrial circulating water systems – Cooling towers, boiler feedwater, and process water.
Food & beverage, pharmaceutical – Process water quality assurance.
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