Manual Version 19 / 01-2019 II Page 17 of 44
SF2 ECCR OPERATION MANUAL
3.4 Aging of oxygen sensors
Oxygen sensors begin to age from the point of production. The rapidity of aging, i.e.
the course of the chemical reaction and thus the consumption of the anode depends
on the surrounding environment Oxygen content and temperature. Usually, the
sensor output in air drops by around 5-10% per year. This means that the output of
an R-17 / R-22 sensor drops by approx. 1 mV per year in air (e.g. from 10 mV to 9
mV) or 5 mV in pure oxygen (from 50 mV to 45 mV). If oxygen sensors are stored in
pure oxygen, the service life is shortened by about a fifth. In the original packaging,
sensors age much more slowly, but they do not rest completely.
NOTE
The aging process of an oxygen sensor does not begin with
unpacking but with the date of manufacture!
WARNING
The SF2 sensors have an imprint:
DO NOT USE AFTER - followed by a date.
When the date is reached, the sensor must be replaced.
The use of an expired sensor can lead to dangerous situations.
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