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Technical Support FAQ

Model UFO-2 Sensor

How often should a calibration be done?
What gas is recommended for calibration?
Is the sensor life span affected by the CO2 concentration level per average use?
Please define shelf life, warranty, and expected life for the ufo-2 sensors.


How often should a calibration be done?

There is no unidirectional drift mechanism in the sensor. However, the sensor is a device sensitive to changes in partial pressure of oxygen, which by Dalton's Law makes the output a function of the sample pressure itself. The best calibration interval will be a function of this and other aspects of the system including desired precision. Generally, for our medical O2 sensors we recommend calibrating before use, or once a day.

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What gas is recommended for calibration?

The typical recommendation is 90-100% of the range of interest for a calibration point. Many users calibrate on air (20.9% O2).

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Is the sensor life span affected by the CO2 concentration level per average use?

It can be if the CO2 concentration is high in the percent level. Continuous exposure to 100% is not recommended.

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Please define shelf life, warranty, and expected life for the ufo-2 sensors.

Shelf Life: This is a Teledyne internal guide. This specification gives us the end date before which we will ship the sensor from our stock.

Example: If a sensor is manufactured on March 27, 2009, and our internal shelf life specification is 12 months from the date of manufacture, we can ship that sensor as late as March 26, 2010. Beyond this date, we will scrap the sensor.

Warranty: This is the period when Teledyne will warrant our products to be free from defects in material or workmanship for the duration of the Warranty. The Warranty period will start from the date the goods are shipped from Teledyne.

Expected Life: This is the theoretical estimation on how long the sensor would last once the sensor becomes electrically active. Most of our sensors are shipped “shorted”, and are shipped in bags that significantly limit the atmospheric air from permeating through. The UFO 130-2B are shipped in tubes that are not airtight, but the UFO 130-2B sensor is shipped “unshorted”, meaning, it is not electrically active until you install the sensor in your device. Hence, the same theory that the Expected Life starts when the sensor is put in service is applicable to UFO 130-2B sensors as well. Actual life of a given sensor varies, sometimes widely, from another sensor of the same class. This is because the native outputs between sensors vary widely. Hence, the estimated life of the sensor is just that, an estimate, and should not be used in any material planning exercises. Teledyne cannot guarantee that any given sensor will always last until the end of its theoretically estimated life. Please remember that commercially, the Warranty period is the driving factor behind consideration of any sensor replacements.

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