The load cell is sized for the requirements of the system. Consequently, for the required torque range of the payoff spool, an off-the-shelf load cell is selected to accurately measure up to the maximum load, the system is designed for. The load cell measures the tension of the media by bending (or deflecting) under load.
Hard stops are present to prevent accidental overload of the load cell. The stops allow the load cell to deflect to full tension but limit this deflection to prevent damage.