Isx 2350 help please!?

[Dynogt17]

Someone explain egr orifice pressure to me? I took my sensor out to check it out of curiosity... After i pulled it. I noticed the tip was small. Went to clean it up and the hole was only about a .25 of what it is cleaned up. Used a ziptie to clean it up inside(until i can replace it). I got quite a bit of soot out of it! Cleaned the sensor tip up then using the ziptie i got alot out of the sensor including little chunks.