Dissolved Oxygen Analyzers

An optical (luminescence) sensor has no membrane or electrolyte to replace and doesn't consume oxygen while measuring, so its reading stays stable for longer and needs less maintenance than a galvanic sensor, which drifts as its membrane fouls or its electrolyte depletes over time.

Aeration blowers are usually the biggest energy user in a biological treatment plant. A DO analyzer feeds the blower's speed control, so it runs only hard enough to hold the target oxygen level instead of running continuously at full output, cutting power use without under-aerating the tank.

Typically around 1.5 to 2 mg/l for conventional activated sludge, but the right target depends on your loading, biology and process design. Your process designer or consultant should confirm the set point for your specific plant.

Yes. The same optical sensing works in fish farming and aquaculture ponds, and in river or surface water monitoring, anywhere a stable, low-maintenance dissolved oxygen reading is needed without a membrane to service regularly.

It needs far less. Because optical luminescence doesn't consume oxygen or rely on a membrane and electrolyte that degrade, the S423 C OPT holds calibration longer than older galvanic sensors, which typically need frequent membrane changes and re-calibration to stay accurate.

The Chemitec Series 30 transmitter is a single-parameter controller with a graphic display, alarms and an analogue output, built to drive blower speed control directly. It's the standard pairing for the S423 C OPT in an aeration tank.