Abstract: A modular detection system for insertion in a strainer basket for detecting, monitoring and tracing sterile material in a sterilization circuit. The modular detection system includes a strainer basket insert which can be inserted directly in the strainer basket or arranged on a base plate. The system further includes the following individually and optionally electrically coupleable modules: a central electronic unit, a defined or freely selectable number of slots for attaching and/or connecting a predetermined number of retainer systems for retaining sterile material, each retainer system having at least one antenna system for reading a transponder in the sterile material. The system further includes a preferably defined number of conductor tracks to electrically connect the slots and/or retaining systems to one another and/or to the central electronic unit.