It’s easy to use:
Once loaded in AutoCAD or AutoCAD LT, “PID Library” will appear in the menu bar.
Choose a category and size of symbols from the pull-down menu.
A dialog box appears showing all of the available symbols and their different views with a description to the left. Choose the symbol you would like to insert and click on “OK”
Insert the symbol in your drawing. It will already be rotated to the correct position.