RaceEngineer:
Xensor also sent me the pinout of the sensor:
Black = - signal
Clear = + signal
Yellow = groundWhen I have to translate this to the Arduino, I have to make the following connections I think:
Black to digital input
Clear to +5V
Yellow to groundCould anyone confirm this? About the black one (- signal) I am not really sure I could connect this to a digital input.
Who from Xensor sent you that woeful pinout list?
Definitely not an engineer.
You need to know
Pin Gnd
Pin Signal
Pin Supply
[soapbox]
If you talk to a "sales engineer" ask to talk to a real engineer, who has had hands on usage.
In my experience a "sales injuneer" is a very good storeman, he knows his product and how to get it to you.
An Engineer knows how it works and talks in the proper language.
[/soapbox]
Tom.... 
(Sorry to all "sales injuneers' out there but thats my experience.)