I am on my second Actifryer, the spinner thing broke on my original one and I was devasted, so make sure you keep the receipt as I did get my money back.
I just love mine, I worked it out if you use approx 1 tsp per portion, that is 2 sins, but this is a guess.
Hopefully there will be some other peeps on here that knows the exact amout.
It does loads of stuff not just chips, so good luck with yours.