O2 and other electrochemical sensors

[solar_plasma]

Can anyone make a qualified guess how much platinum there may be in the EC sensors of those (left upper corner you can choose english language):

http://www.google.de/imgres?biw=160...220&start=0&ndsp=40&ved=1t:429,r:11,s:0,i:113

 

[solar_plasma]

Or can anyonesay, if there is Pt in it at all? Do all O2 sensors contain Pt?

If you don't know, please guess and tell what you believe.

 

[niteliteone]

From a personal perspective, they all contain massive amounts of PM's that are usually dripping off the insides :shock: at least until I rip them apart and only find a plated connector or component that is flash plated with something I want. :lol:
I believe on auto's, the emissions system needs platinum sensors due to the extreme conditions the sensor is working in, but I don't know if they utilize the platinum as a reactant or a protector. Hope that makes sense.
With the sensor you posted, I would assume it contains something of value, I just don't know if it would be worth recovery until I try one.

 

[solar_plasma]

From a personal perspective, they all contain massive amounts of PM's that are usually dripping off the insides

:lol: :lol:

Thank you, Tom! Yes, the instument itself surely is better than a cell phone, but I meaned only the sensor cartridges, which are getting replaced maybe once a year.The technician who recently comes for calibrating those instruments always takes the old cartridges back to his facility. I just wondered,if they make a big business with that scrap.

 

[niteliteone]

The technician is probably keeping the old replaced sensors himself, for their value much like most of us here would do :shock:

 

[solar_plasma]

I found something nice:

sensor type CC (in german WT=Wärmetönungseffekt) contains Pt or Pd as a catalyst and a platinum heating wire, which is hidden in a ceramic perl

http://de.wikipedia.org/wiki/Gassensor
http://www.gasmessung.de/fileadmin/gfg/Produkte/PDF/Gastabelle_D_Internet08.pdf
http://www.gfgeurope.com/fileadmin/gfg/Produkte/PDF/Gastabelle_GB_2009.pdf

 

[niteliteone]

From what I was able to find in English language Wiki is that their are many different types of sensors used and many of them use a "silicon dioxide" based sensor.
Their is one type of sensor that IS made of PM's, the "Electrochemical gas sensor";
quote from Wiki,
http://en.wikipedia.org/wiki/Electrochemical_gas_sensor

"Construction
The sensors contain two or three electrodes, occasionally four, in contact with an electrolyte. The electrodes are typically fabricated by fixing a high surface area precious metal on to the porous hydrophobic membrane... "

I got this link from your original wiki link posted above, by following the English page link, so it should be available on your link as well.

 

[solar_plasma]

Okayyyy, in the german wiki they didn't say anything about PMs in EC... so

CC sensor: Pt or Pd positive
EC sensor: PM's positive

CC and EC are beside selectiv infrared sensors the most common ones.

...that I call synergetics! 8)

 

[niteliteone]

I guess wiki just re-enforces the old saying of "Lost in translation" :shock:

 

[solar_plasma]

In fact it is always worth to read the wiki articles in all languages you understand, since they aren't translations, but independent articles. About chemicals there is a lot more on the german site, but chemical terms and processes are much more sophisticated on the english sites. The skandivian wikis are only worth reading, if you research anything special to scandinavia. I wish I could read french and spanish.