Abstract: A take-up frame assembly is instrumented with a sensor for detecting tensile or compressive loading on the assembly during adjustment. A visual readout of the loading is provided as feedback to an operator in making system adjustments. The readout may be resident at the take-up frame, or part of a portable module coupled to the sensor during adjustment. In systems including a pair of take-up frames on either side of a machine, such as a pulley-driven belt conveyor, the sensor and feedback arrangement can be used to balance forces on both sides of the system to achieve the desired operational belt tension.

Abstract: An apparatus for providing an indication of the operational stability of a photoelectric control unit. The system separately measures photoelectric operating margin and background noise affecting the control unit. A stability figure is generated as a function of the operating margin and background noise in accordance with fuzzy logic techniques. An indication of the level of this stability figure is provided to the operator of the unit.