Notice

You are currently browsing the website for customers from Slovakia. We recommend switching to the United States version of the site, optimized for your region.
Slovakia
€ EUR
Prices without VAT

And where´s the oxygen?

With the Figaro sensors, it´s possible to determine an oxygen concentration accurately and reliably.
This is an archive article published 02/17/2014. Some information may no longer be up to date and in line with the current state. Please contact us in case of interest.

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 air.

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 Figaro. There 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.

 And where´s the oxygen?

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 info@soselectronic.com.
Advantages/ Features:
  • 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
Do not miss these articles

Do you like our articles? Do not miss any of them! You do not have to worry about anything, we will arrange delivery to you.

Additional products


KE-25 FIGARO  
KE-25

Oxygen (O2) Gas Sensor 0 to 100%

Gas Sensors

Ord. No.: 53099
Manufacturer: FIGARO
No longer available

SK-25F FIGARO  
SK-25F

Oxygene (O2) Gas Sensor 0 to 30%

Gas Sensors

Ord. No.: 76635
Manufacturer: FIGARO
No longer available

KE-50 FIGARO  
KE-50

Oxygen (O2) Gas Sensor 0...100%

Gas Sensors

Ord. No.: 83597
Manufacturer: FIGARO
No longer available
Do you agree with cookies being stored?
Welcome to the SOS electronic website. Before you enter our online world, we would like to ask you to allow us to store cookies on your browser. Your consent will help us view the site without error, measure its performance, and track additional statistics. Apart from that, we can bring you an offer of our products and services, literally tailor-made. We also provide cookies to third parties. However, you are definitely safe with us.
The proper operation of the website
More stable technical control
Better marketing offer
Necessary Only selected Accept all cookies
Change the settings
Country
Select the country you are located in to receive relevant information and services tailored to your region.
Choose a language
Select your preferred language for displaying website content and communicating with our support.
Currency
Select the currency in which you want to see product prices. This way, we ensure you see current prices tailored to your needs.
Show prices with VAT
Select whether you want to display prices with or without VAT to have a better overview of costs.
Prices without VAT Prices incl. VAT