Non production work is work that doesn't have a clear deliverable associated with it. Examples are office work, meetings, facilitation, coordination, etc.
Go to the non-production log page (you must be logged in), enter date, activity, and chose Tape sensor project. Add short description and a link (if necessary), and press SAVE. You can enter multiple activities before you press SAVE.
Production work has a deliverable - work done on a design, prototype of manufacturing.