Sensor Cap Life Sample Clauses

Sensor Cap Life. All optical dissolved oxygen sensors work on the same principle, and all must have the sensor cap containing the luminophore replaced periodically due to a phenomenon known as photo bleaching. When a sensor cap is new, the luminophore will return a large number of red photons when excited. As time goes on, a bleaching effect takes place and the number of red photons returned reduces to a point where they are no longer detectable. The amount of photo bleaching that the luminophore suffers is in direct proportion to the amount of time it is excited by the sensor’s blue light source. It therefore follows that the faster a reading can be taken, the less time the luminophore needs to be excited and the longer it will last. The high-speed circuitry within the Micro 800 Probe requires just eleven milliseconds to take a reading. This incredibly fast reading time increases the useful life of the luminophore considerably. Another technique used to prolong the life of the luminophore in the Micro 800 is variable excitation brightness. When the luminophore is new, the brightness of the excitation is reduced to a minimum in order to prevent unnecessary photo bleaching. As the output from the luminophore gradually reduces, the brightness of the excitation is increased in order to squeeze the maximum possible life from the sensor cap. The combination of low duty cycle and variable excitation brightness can stretch the useful life of a sensor cap as far as several years.
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