RDO® TRIO Water Quality Sonde: Reliable Dissolved Oxygen Monitoring in Harsh Environments
Reliable dissolved oxygen data is essential for managing water quality in aquaculture, coastal waters, and long-term environmental monitoring applications. But in high-biofouling and variable-salinity conditions, maintaining accurate measurements over time is often the biggest challenge.
The RDO® TRIO Water Quality Sonde is purpose-built to address this reality. Designed for extended deployment in demanding environments, it combines optical dissolved oxygen measurement, built-in salinity compensation, and advanced antifouling protection to deliver dependable data with minimal maintenance.
Developed by In-Situ, the RDO TRIO is engineered for professionals who need confidence in long-term trends, not just spot measurements.
Designed for Long-Term Deployment in Challenging Conditions
The RDO TRIO integrates dissolved oxygen, temperature, and conductivity sensors into a single rugged instrument. This integrated design allows the sonde to automatically compensate dissolved oxygen readings for changes in salinity, helping maintain accuracy even in environments where conditions fluctuate daily.
By using optical dissolved oxygen technology rather than traditional electrochemical sensors, the RDO TRIO reduces sensor drift and lowers routine maintenance requirements, making it well suited for unattended monitoring programs.
Advanced Antifouling Protection for High-Biofouling Environments
Biofouling is one of the most common causes of data loss in long-term water quality monitoring. The RDO TRIO addresses this challenge with a copper-infused sensor guard and a flat-faced optical sensor design that actively discourages biological growth.
For deployments in especially aggressive environments, an optional integrated wiper provides an additional layer of protection by keeping sensor faces clean and reducing the need for frequent site visits.
Intelligent Wiper System That Protects Data Quality
When equipped with the optional wiper, the RDO TRIO can be configured to automatically clean the sensor when dissolved oxygen readings fall below a user-defined threshold. This helps prevent false low readings caused by fouling rather than actual water quality changes.
By maintaining cleaner sensors between service intervals, the intelligent wiping system supports more reliable data and can help reduce unnecessary aeration responses in aquaculture operations.
Built-In Salinity Compensation Without Recalibration
Changes in salinity can significantly affect dissolved oxygen measurements if not properly accounted for. The RDO TRIO uses simultaneous temperature and conductivity measurements to automatically compensate DO readings, maintaining accuracy without requiring recalibration when salinity varies.
This capability is particularly valuable in coastal, estuarine, and aquaculture environments, where salinity can change rapidly due to tides, rainfall, or operational conditions.
Seamless Integration with Telemetry, Software, and SCADA
The RDO TRIO integrates seamlessly with VuLink® telemetry, HydroVu®, and VuSitu®, providing straightforward configuration, cloud-based data access, and full visibility across monitoring networks.
An open Modbus interface also allows easy integration with SCADA systems, controllers, and third-party telemetry devices, making the RDO TRIO adaptable to both new installations and existing infrastructure.
A Practical Solution for Reliable Dissolved Oxygen Monitoring
Whether you are expanding an aquaculture facility, upgrading a coastal monitoring site, or building a long-term environmental monitoring network, the RDO TRIO offers a practical balance of data reliability, reduced maintenance, and operational confidence.
By combining optical DO measurement, salinity compensation, and antifouling protection in a single instrument, the RDO TRIO helps ensure your data reflects real conditions, not sensor limitations.