Optical Dissolved Oxygen Sensor with ± 0.05 mg/L + 1% Accuracy and 90% Response Time < 90 Seconds for Fast Response Water Quality Monitoring

The Yokogawa SMART optical dissolved oxygen sensors DO71 and DO72 offer exceptional durability and stability with minimal maintenance requirements. These sensors feature fast response times, no warm-up period, and outstanding long-term stability - qualities that enable significant process and cost optimization.

• Robust stainless-steel body with flat sensor surface for easy cleaning
• Wide measurement range from low ppb levels to saturated oxygen in water
• Ideal for wastewater treatment and industrial oxygen monitoring in challenging environments
• Digital SMART sensors with RS-485 communication for easy calibration
• Compatible with Modbus HOST systems including PLCs and Yokogawa FLXA402 analyzers

The DO71/DO72 utilize a fluorescence phase-shift method that is less susceptible to contamination than intensity-based methods, delivering more accurate measurements over time.

Maintenance is simplified with tool-free sensor cap replacement at the tip. The electrolyte-free design enables continuous long-term operation without maintenance.

The DO71 and DO72-W (0-22.5 mg/L) are ideal for wastewater treatment and process control, while the DO72-T (0-2 mg/L) is designed for low concentration applications like SWAS. Multiple cleaning options make these sensors suitable for demanding applications requiring strict water quality control.

The 4-wire FLXA402 liquid analyzer can connect multiple sensor types (pH, conductivity, DO) to create customized measurement systems tailored to specific process requirements.

With a 90% response time under 90 seconds, these sensors quickly track oxygen concentration changes in dynamic processes.