Water Monitoring
ND-NTU Optical Turbidity & Temperature Sensor
What is the ND-NTU? The ND-NTU is a precision optical turbidity and temperature sensor for continuous water quality monitoring. The optical 90° nephelometric method delivers measurements from 0 to 4000 NTU (or 0–4500 mg/L suspended solids) with better than 5 % accuracy — ideal for outdoor remote monitoring, urban and industrial wastewater, surface water, sea water, fish farming and drinking water systems connected to the yDoc ML-525 datalogger.
The ND-NTU is a precision optical turbidity and temperature sensor for continuous water quality monitoring. The optical 90° nephelometric method delivers measurements from 0 to 4000 NTU (or 0–4500 mg/L suspended solids) with better than 5 % accuracy — ideal for outdoor remote monitoring, urban and industrial wastewater, surface water, sea water, fish farming and drinking water systems connected to the yDoc ML-525 datalogger.
Key parameters
What the ND-NTU measures
Turbidity
0–4000 NTU — wide measurement range
Suspended solids
0–4500 mg/L equivalent measurement
Temperature
0–50 °C, ±0.5 °C accuracy
Direct integration
7 m cable to the yDoc ML-525 over SDI-12
Specifications
Technical specifications
Applications
Where the ND-NTU is used
Outdoor remote monitoring
Long-term unattended turbidity monitoring in remote watercourses and reservoirs.
Urban wastewater treatment
Influent and effluent turbidity for treatment plant control and discharge monitoring.
Industrial effluent
Compliance monitoring of industrial process water and discharge to receiving waters.
Surface & sea water
Environmental monitoring of rivers, lakes, estuaries and coastal waters.
Aquaculture
Water clarity monitoring for fish farming, aquariums and shellfish operations.
Integration
Powered by the yDoc ML-525 datalogger
The ND-NTU connects directly to the yDoc ML-525 datalogger. The yDoc powers the sensor, schedules measurements, stores readings locally and transmits them to the Sensor-Online platform via 4G/LTE-M, NB-IoT, LoRaWAN, satellite or Ethernet — with up to 10 years of battery life.
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FAQ
Frequently asked questions about the ND-NTU
What does the ND-NTU measure?+
Will algae or biofouling affect readings?+
How does it connect to the yDoc ML-525?+
Ready to deploy the ND-NTU?
Get a quote, technical advice, or a complete bundle with the yDoc ML-525 datalogger and Sensor-Online platform subscription.