Tyre pressure sensor?

[c-square]

I just changed my run-flat tyres and when they removed the old tyres from the rims, I took a peek and try to locate where the sensor which gauge the tyre pressure (the sensor that inform us when there is a pressure loss in any of the tyres) and I couldn't find any. Can anyone let me know where are those sensor located?

 

[jarance]

it is located at the valve where you pump the air. make sure that the tyre shop change this special valve.

 

[c-square]

Thanks for the pix, Jarance.... but I don't think my original wheels come with that device. When the tyre shop pried open those worn out original Bridgestone tyres, I original air valve looked like any other ordinary rubber ones. Don't have that square black-thingy wor. I asked the tyre shop (Speedline @ Kota Damansara) fella and he said the it uses "Infra-red" to gauge the tyre pressure. I am a bit sceptical on that infra-red explanation, so I thought of asking here to get a better understanding.

 

[sixpotters]

on the E60 it uses rotating speed of each wheel to detect deflation. There is no sensor on the rim. Not sure which model of BMW you own.

 

[c-square]

Thanks sixpotter for the possible alternative perspective. Mine is a F30. Could be the same as the E60