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ND-OPTOD Optical Dissolved Oxygen & Temperature Sensor
What is the ND-OPTOD? The ND-OPTOD is a precision optical dissolved oxygen and temperature sensor designed for long-term unattended water quality monitoring. The optical luminescence method requires no membrane, no electrolyte and no frequent calibration — making it ideal for wastewater treatment, industrial effluent, open water monitoring, fish farming and drinking water supply networks connected to the yDoc ML-525 datalogger.
The ND-OPTOD is a precision optical dissolved oxygen and temperature sensor designed for long-term unattended water quality monitoring. The optical luminescence method requires no membrane, no electrolyte and no frequent calibration — making it ideal for wastewater treatment, industrial effluent, open water monitoring, fish farming and drinking water supply networks connected to the yDoc ML-525 datalogger.
Key parameters
What the ND-OPTOD measures
Dissolved oxygen
0–200 % saturation, 0–20 mg/L, 0.01 mg/L resolution
Temperature
0–50 °C, 0.01 °C resolution, ±0.5 °C accuracy
Maintenance-free
No membrane, no electrolyte — minimal calibration drift
Direct integration
Connects to yDoc ML-525 over SDI-12
Specifications
Technical specifications
Applications
Where the ND-OPTOD is used
Wastewater treatment
Continuous DO monitoring in aeration tanks for nitrification, denitrification and energy optimisation.
Industrial effluent
Compliance monitoring of treated industrial discharge before release to receiving waters.
Open water monitoring
Long-term DO and temperature in lakes, rivers and reservoirs for environmental surveillance.
Fish farming & aquaculture
Critical DO data for fish welfare and feed/aeration management in commercial aquaculture.
Drinking water
Source water quality and reservoir monitoring for municipal drinking water systems.
Integration
Powered by the yDoc ML-525 datalogger
The ND-OPTOD 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-OPTOD
What does the ND-OPTOD measure?+
How often does it need calibration?+
Why optical DO instead of membrane?+
Ready to deploy the ND-OPTOD?
Get a quote, technical advice, or a complete bundle with the yDoc ML-525 datalogger and Sensor-Online platform subscription.