The OxySense range of online DO meters utilizes the very latest and best optical DO sensor available in the world today. It is an optical luminescent device which is extremely resistant to abrasion, extremely stable, and has greatly reduced maintenance and whole life costs.
The OxySense Optical Dissolved Oxygen Meter with self-cleaning and self-verification offers enhanced reliability and unrivaled low maintenance. Optical DO meters have largely replaced electrochemical DO sensors (Clark Cells) due to their better reliability and lower maintenance requirements.
The OxySense DO sensor is available with different controllers giving you the same great performance with different communication, display, and control options. With the OxySense range of online DO meters, you get everything that you need – and nothing that you don’t.
Principle of Operation
The sensing element (lumiphore) is activated, or excited when illuminated with a blue light. When activated, the lumiphore then emits blue light in an intensity that is inversely proportional to the amount of oxygen present in the water. There is also a time delay between the peak emission of blue light and peak response of fluoresced red light. The amount of delay is inversely proportional to the amount of oxygen present. This time delay can be expressed as a phase shift between the wave patterns of incident blue light and the fluoresced red light. This is in turn reported by the electronics into a ppm or mg/l reading of Dissolved Oxygen. The advantages of this technology are that it is more stable than traditional electrochemical devices and far more resistant to abrasion. By using the state of the art sensor and electronics together the reliability, accuracy, and flexibility of the OxySense Meter is far superior to that of its competitors.
- Rugged optical design DO meter
- Better performance than its competitors’ dissolved oxygen sensors
- Self cleaning option – eliminates the need for maintenance
- Self verification option – automatic sensor check
- Range of process control PID options – reduces labor costs
- Proven reliability
- Up to 36 months between calibration and maintenance events
- Data-logging and remote internet access with text alarms
What is probably the worlds most reliable Dissolved Oxygen sensor from In-Situ® the RDO® sensor coupled with Pi’s award winning electronics provides up to 36 months between maintenance and calibration events and results in probably the best online DO meter available in the world today.
The self-verification option is revolutionizing calibration routines in that this dissolved Oxygen monitor is able to check it’s own functionality on a regular basis and call for calibration when necessary.
- No chemicals or moving parts
- Optional self-cleaning sensor and self-verification
- Stable and reliable – excellent process control
- Suitable for all Dissolved Oxygen applications
- Up to 36 months between maintenance
- No calibration
The OxySense optical sensor is available with different controllers giving you the same great performance with different communication, display, and control options. With the OxySense range of online DO meters, you get everything that you need – and nothing that you don’t.
The OxySense DO Meter is the first of its kind in the world to offer automatic insitu sensor verification as an option. The OxySense DO Meter is able to reduce maintenance by automatically checking it’s sensor operation at user defined time intervals. Calibration on the In-Situ® sensor is normally required only once per annum so with the automatic sensor verification option and the self clean option the sensor may not need to be inspected at all for a full year.
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It is probably the most reliable and cost effective DO sensor available as it;
- is extremely resistant making it last longer in the harsh environment of an aeration lane
- can self clean and self check its response every time it cleans.
How does the self clean work?
Pi has developed a special end cap that screws onto the end of the sensor. It is smooth and low profile to reduce the possibility of ragging. An air blast cuts across the flat sensor end helping it clean.
How does the self check work?
When the sensor is being cleaned the design of the end cap means that the water is excluded from the end cap by the force and volume of air. This cleans the end cap (lumiphore) and exposes the sensor to air. The sensor then reads the DO in air (which is much greater than in water) and that response is measured. If the response is not what is expected an error is flagged for the operator to intervene.
How does the control work on the autoclean?
How often and for how long the sensor is cleaned is set on the simple controls on the analyzer itself. It is also possible to set a ‘hold’ for the output from the analyzer to ensure that the control is not affected by the self clean. This ‘hold’ starts at the beginning of the cleaning cycle and continues for a user defined time after the cleaning cycle.
How often do I need to change the lumiphore?
That depends on the process but three years is typical.
Is it easy to change the lumiphore?
Yes very! You just pull the old one off and push the new on one. No need to enter anything on the analyzer.