aDO Oxygen Sensors
Optical DO sensors for water quality management and aquaculture applications.
More Information about the aDo series
The latest solution for smart optical dissolved oxygen measurement is designed for harsh and demanding environments. Based on the optical principle of fluorescence quenching, the SentrOxy aDO dissolved oxygen sensors combine high measurement performance with low maintenance and cost of ownership. Designed for applications in aquaculture management, the SentrOxy aDO series is ready for use in water treatment plants, inland- and seawater pond production, open pen production, recirculation systems, and hatchery operations. Most electrochemical sensors require recalibration and maintenance every two months, if not more frequently. The SentrOxy aDO sensors were designed to avoid this operational hurdle. The sensors do not need membranes or filling solution and do not require frequent calibration. The sensors can be connected directly to a process control system by using the 4(0)-20mA analog outputs off the watchdog function.
This precise sensor optic allows for the generation of up two separate optical oxygen measurement channels, each which measure in independent areas of the same measuring cap. This innovative and patented principle allows for real-time referencing. This breakthrough makes measurements much more robust and also for quick detection of mechanical defects of the membrane or measurement effects caused by air bubbles. Due to the rugged and inert design, the probe can withstand harsh conditions and will not corrode in high salinity environments.
The Sentronic measuring cap's solid sensing element is free of fragile membranes, electrolyte and placed in a robust replaceable cap. The need to replace just a single part minimizes service time and cost. Each sensor has pre-loaded calibration coefficients. Two calibration procedures are possible. Operators can select either the one-point-adjustement to adjust the sensor cap or the well-known two-point calibration. The adjustment and calibration data are stored in a history table in the sensor memory. As the optical sensing principle does not consume any oxygen, the measurement is flow independent. Furthermore, the measurement is not biased by common solutes e.g. chloride, ammonium, hydrogen sulphide, carbon dioxide.
Sentronic offers a number of accessories for SentroOxy products to ensure the solution is ready to be installed on delivery. The SentrOxy aDO sensors have threads on each end for mounting the accessories. A fixture with mounting holes for strain relief cable and additional weights for fixtures are available. These accessories are combined with an air tube adapter to use as a cleaning head. Additionally, Sentronic offers an adapter to mount the sensor to a 2 inch male threaded pipe as well, and a protection cap to protect the membrane against fish bites.
Sentro.IO is a flexible, radio-controlled interface that enables the simple, wireless exchange of information between the sensor and a broad range of passive control units and accessories. By placing function-specific tags close to the sensor, users can control, calibrate and communicate with the device without attaching or detaching any cables.
- SentrOxy aDO sensors use optical technology instead of an electrochemical method to reports real-time values of oxygen and temperature conditions.
- SentrOxy aDO sensors are the world's first smart DO sensors having built-in control options tfor direct control, e.g. solenoid valves, pumps, alarm systems or feeders.
- These sensors feature a patented system with two separate measurement channels for real-time referencing for more measurement safety.
- Sentro.io is our unique radio-controlled interface for wireless, two-way tag-sensor communications to control, calibrate or monitor the operation and health status of the sensor. Time- consuming uninstallation for maintenance and adjustment purpose is a thing of the past.
- A standard function of our smart SentrOXY sensors is the constant monitoring of the overall health status of the sensor and its sensing element.
- The solid sensitive element is placed in a robust cap.
- Wireless identifications and pre-loaded calibration coefficients simplify replacement.
- No need to replace fragile oxygen membranes or refill an electrolyt solution fminimize maintenance effort and cost of ownership.
- Long term stability reduce calibration task and reduce the labor costs.
- No corrosion of sensor in high saline environments by using inert POM.
- These sensors are insensitive to common interference that degrade classical membrane-based sensors. No oxygen consumption, no cross sensitivity to chloride, ammonium, hydrogen sulphide, carbon dioxide, and other.
- Flexible and robust communication with the smart sensors via digital RS485 bus using Modbus RTU protocol. Optional interfaces, such as two configurable and adjustable 0-20mA/4-20mA interfaces, or digital input/output interfaces for direct control of actuators, such as solenoid valves, complete the interface variety.
- Additional transmitters are not required. This saves the budget.
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