Sensor COD: How It Works and Why It Matters

A COD sensor is used to monitor Chemical Oxygen Demand in wastewater or process water. On Fortuna Argatech’s official product page, the offered COD sensor is the RIKA RK500-25 with UV method, 254/850 nm LEDs, turbidity and temperature compensation, IP68 protection, and SS316L housing.

COD matters because it reflects the amount of organic load that must be oxidized in water. Hach describes COD as the amount of dissolved oxygen needed to oxidize chemical organic materials in water. That makes COD useful for understanding the early impact of wastewater on receiving waters.

What is COD?

COD stands for Chemical Oxygen Demand. In water analysis, it indicates the oxygen needed to oxidize organic material present in the sample.

The higher the COD, the greater the organic load is likely to be. That is why COD is a key parameter in industrial wastewater and treatment monitoring.

Why monitor COD?

To assess organic load

COD helps teams see whether wastewater carries a high organic burden.

To support compliance

Monitoring COD helps with treatment control and discharge-limit compliance.

To detect changes early

If COD rises unexpectedly, teams can check the process before the issue grows.

To support continuous monitoring

COD is often tracked together with parameters such as turbidity, pH, and temperature.

How does the COD sensor work?

The RIKA RK500-25 uses an optical UV method. In simple terms, the sensor reads the response of specific light wavelengths to estimate COD in water.

On the product page, Argatech lists these features:

• 254 nm and 850 nm LEDs
• turbidity and temperature compensation
• 0–3000 mg/L measurement range
• ±5% accuracy on standard solution
• 0.01 mg/L resolution
• IP68 protection
• SS316L housing

When is this sensor used?

A COD sensor fits when:

• wastewater must be monitored in real time
• industrial processes need water-quality control
• teams need data that can be compared over time
• the monitoring system is connected to a dashboard or data logger

Key specifications

All specifications below refer to Fortuna Argatech’s official product page: https://argatech.com/sensor/sensor-cod-chemical-oxygen-demand/ (no date).

• Brand: RIKA
• Model: RK500-25
• Parameter: COD
• Measurement range: 0–3000 mg/L
• Accuracy: ±5% on standard solution
• Resolution: 0.01 mg/L
• Light source: 254 nm and 850 nm LEDs
• Compensation: turbidity and temperature compensation
• Protection: IP68
• Housing material: SS316L

What do these specs mean in the field?

• The 0–3000 mg/L range fits wastewater and industrial process monitoring.
• UV LED measurement supports optical sensing.
• Turbidity and temperature compensation improves stability.
• IP68 and SS316L help in wet and aggressive environments.

COD sensor in the monitoring ecosystem

A COD sensor is often part of a larger system such as ONLIMO, SPARING, or other industrial monitoring setups. In that structure, the sensor is not isolated; it is the source of data for dashboards and evaluation.

Main benefits

• helps teams read organic load faster
• supports real-time monitoring
• makes water-quality evaluation easier
• helps wastewater treatment control
• strengthens compliance and operational response

Conclusion

A COD sensor is an important tool for structured water-quality monitoring. With UV measurement, turbidity and temperature compensation, and real-time integration, it helps teams monitor wastewater conditions more consistently.

FAQ

Sources

• Fortuna Argatech. (no date). Sensor COD (Chemical Oxygen Demand). https://argatech.com/sensor/sensor-cod-chemical-oxygen-demand/
• Hach. (no date). Chemical Oxygen Demand (COD) Testing, Instruments and More. https://www.hach.com/parameters/chemical-oxygen-demand