**-And where´s the oxygen?
**-With the Figaro sensors, it´s possible to determine an oxygen concentration accurately and reliably.
Biochemistry, medical, air-conditioning, plant growing in glass-houses,
protection against fire or explosion,… these are only a few fields, where it´s
usually necessary or at least desirable to know exact concentration of oxygen in
Oxygen ... one of the most important elements for life. But how to measure it?
An old known method says about a burning candle and until it burns it´s OK… or
in other words, the O2 concentration is above approx. 15%. Naturally this is a
method usable only somewhere and only for a rough orientation. Fortunately,
there also exist some more accurate components - oxygen sensors.
In our portfolio can be found the top level sensors series KE, as well as a
novelty - SK25F, both from a pioneer in segment of sensors - Japan company
are a few principles how to create an oxygen sensor and the method of a galvanic
cell belongs to the most reliable ones. What is it about? The whole sensor is
constructed as a miniature battery with an acid electrolyte and electrodes from
gold and Lead. A solid oxygen permeable membrane enables access of a small
amount of gases into a battery. That causes a chemical reaction at which Pb
oxidizes to PbO while emitting electrons. This results into an essential fact,
that this sensor doesn´t require any power supply - it behaves as a battery
with an output voltage proportional to an oxygen concentration. An outstanding
feature of this type of sensors is a high selectivity (virtually no sensitivity
to other gases) and a high linearity. That´s why to calibrate a sensor, it´s
usually sufficient to measure in two points (zero concentration and approx. 21%
concentration at a common air). A disadvantage is, that a lifetime is limited by
exhausting a Lead electrode and it is roughly several years.
KE25 is a bigger type with a long lifetime, with only
one limitation - that it can´t be installed in an upside-down position. A
novelty - type
SK25F is very suitable for miniature devices usable in
any position. Both types feature a built-in temperature compensation, so their
usage is very straightforward. Details and useful tip for a successful usage can
be found in the
Figaro KE and
Figaro SK25F technical guides.
KE25 and also SK25F are in our standard stock offer. Upon order we´re able to
provide you also the KE50 type with even longer lifetime. In case of interest,
please contact us at
- oxygen sensors for a universal usage
- high sensitivity
- excellent linearity
- virtually no influence from other gases
- contains a temperature compensation
- extremely simple usage
- lifetime in several years