New Optical Dissolved Oxygen Sensor Designed for Process Applications

The new Rugged Dissolved Oxygen (RDO®) PRO sensor from In-Situ (USA) is designed for demanding process applications and features an abrasion-resistant foil that withstands fouling, high sediment loads, and rapid flow rates. The sensor cap is pre-loaded with calibration coefficients to speed set up and eliminate programming errors.

The RDO PRO sensor offers openarchitecture communication protocols, including Modbus over RS485, SDI-12 (version 1.3), or 4-20 mA signal outputs. The RDO PRO eliminates the need for costly external transmitters or controllers and operates on a 8 to 36 VDC input or 4-20 mA three-wire current loop. Corrosion-resistant construction and durable sensing foil design provide consistent, reproducible results (<0.05 mg/L reproducibility) in demanding environments. The RDO PRO offers reliable, low-maintenance performance to water quality specialists in municipal or industrial water and wastewater treatment plants, aquaculture settings, dam discharge

applications, and food/beverage process control environments.

The In-Situ RDO sensor measures DO using the principle of “dynamic luminescence quenching” according to ASTM Method D888-05, Test Method C. Compared to Clarkcell type sensors, the RDO PRO sensor can lower the total cost of acquiring consistent, high-quality data. The In-Situ RDO sensor significantly reduces instrument checks and recalibration. The RDO PRO sensor is factory-calibrated and requires a quick two-point

calibration upon deployment. The calibration can last for several months if sensor fouling is minimal and if the foil is not mechanically damaged or removed. If fouling is high, the sensor can typically be cleaned and redeployed without recalibration. Field-replaceable caps streamline maintenance, reduce costs, and eliminate programming errors.