YSI EXO Optical Dissolved Oxygen Sensor
Features
- 0 to 50 mg/L measurement range
- T63<5 sec response time
- ±0.1 mg/L or 1% of reading accuracy from 0 to 20 mg/L
- Free ground shipping
- Expedited repair and warranty service
- Lifetime technical support
- More
The EXO optical dissolved oxygen sensor is a digital smart sensor featuring welded titanium construction and wet-mateable connectors. For long-term, in situ continuous monitoring of dissolved oxygen, the EXO2 and EXO3 sondes have a wiper to clean the dissolved oxygen sensor to avoid sensor fouling and maintain accuracy.
The principle of operation of the EXO optical dissolved oxygen sensor is based on the well-documented concept that dissolved oxygen quenches both the intensity and the lifetime of the luminescence associated with a carefully chosen chemical dye. The EXO DO sensor operates by shining a blue light of the proper wavelength on this luminescent dye which is immobilized in a matrix and formed into a disk. The blue light causes the immobilized dye to luminesce and the lifetime of this dye luminescence is measured via a photodiode in the probe. To increase the accuracy and stability of the technique, the dye is also irradiated with red light during part of the measurement cycle to act as a reference in the determination of the luminescence lifetime.
When there is no oxygen present, the lifetime of the signal is maximal; as oxygen is introduced to the membrane surface of the sensor, the lifetime becomes shorter. Thus, the lifetime of the luminescence is inversely proportional to the amount of oxygen present and the relationship between the oxygen pressure outside the sensor and the lifetime can be quantified by the Stern-Volmer equation: ((Tzero/T) – 1) versus O2 pressure. For most lifetime-based optical DO sensors, this Stern-Volmer relationship is not strictly linear (particularly at higher oxygen pressures) and the data must be processed using analysis by polynomial non-linear regression. Fortunately, the non-linearity does not change significantly with time so that, as long as each sensor is characterized with regard to its response to changing oxygen pressure, the curvature in the relationship does not affect the ability of the sensor to accurately measure oxygen for an extended period of time.
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