BOD/COD Online Analysers

It's an online sensor that reports organic pollution load continuously, instead of a lab test that takes hours for COD or five days for BOD. The Chemitec S480 does this by measuring UV absorption at 254 nm and applying a correlation to your effluent, giving a live COD, BOD or TOC equivalent.

Accuracy depends on how well the correlation is calibrated to your specific effluent, since different organic loads absorb UV differently. The S480 has a repeatability of 0.2% and a 4-second response time, but periodic lab samples are still needed to check and adjust the correlation as the effluent changes.

No. It's a purely optical measurement: an LED shines UV light through the sample and a photodiode measures how much is absorbed. That means no reagent bottles to refill and no waste chemicals to dispose of, unlike a wet-chemistry COD test.

The nano-coated windows and compressed air flushing give long operating periods without manual cleaning, with required supervision under half an hour a month. Exact intervals depend on how much grease or fibre is in your effluent stream.

It replaces routine monitoring and gives early warning of organic load peaks, but it doesn't remove the need for lab testing. Periodic lab samples are still used to check and re-calibrate the correlation, and regulators may still require lab reports for compliance.

Pick a shorter path, such as 0.3 or 1 mm, for high-strength or dark effluent, and a longer path, such as 10 or 50 mm, for cleaner streams where you need to detect small changes. Tell us your expected COD range and we'll confirm the path length.

The S480 is the UV sensor that takes the measurement in the pipe or tank. The Series 50 is the display and logging unit: it can show up to 8 simultaneous measurements, log 250,000 records and send alarms, so it's used when you want BOD/COD alongside other parameters at one point.