Hi Francesco,
In istSOS the name of a procedure is just its name. Often, for shake of semplicity people use names that are meaningful for them.
What service URL are you referring to?
You should send a "describe sensor" request and see the associate observed properties that should indicate the properties the sensor is registering.
If you have access to the web interface you can find it in several places, for example in the viewer, when you add a sensor for plotting it shows the observedProperties...
Eventually also only selecting the station from the map...
Btw, which istSOS URL are you looking at?
Best,