R.K.B. Opto-Electronics has introduced the Sentinel splice detection system. It is a self-calibrating system that is powered by 24VDC and provides an opto-isolated, digital electronic output with a pulse width selectable for 1, 10 or 100 milliseconds. The Sentinel can be connected directly to PLC control devices or interfaced into existing marking systems or directly controlled devices. The unit can be mounted anywhere along the web at any angle.