Hi Zoomer-b,
Welcome to Chandoo.org!!
I am not sure about the inbuilt features on this, but one should be there like protection or restriction of query etc.
Well, here is one possible I would try is to password protect the sheet, and have one command button in has vba code to refresh PT on click. Also, you may have to add lines to unprotect and protect before and after the refresh command.
Let us know if you need help in this, we shall be glad to assist you.
Regards,
Prasad DN