1. Perfect Sterilization for Hollow and Porous Load This B-Class sterilizer achieves the best sterilizing performance by minimizing the deviation of chamber temperature because cylindrical chamber is surrounded by jacket where the saturated vapor is generated by emerging heater and over the set sterilization temperature is maintained through a cycle, and also drying performance is excellent by a reason of flowing the dry saturate vapor generated from the jacket into the chamber. This small steam sterilizer delivers enhanced sterilization performance by combining an innovative cycle program and a powerful vacuum system for air removal. It can meet the Sterility Assurance Level (SAL=10-6 CFU: EN 556) for hollow loads with materials that are very hard to sterilize within the shortest time. Especially various user settable cycle programs are prepared for performing in any condition of sterilization, maximize the convenience for controlling and easy for operating the sterilizer by adopting the enlarged color touch screen monitor and exclusive control system which allow of operating the sterilizer one touching and checking the state of cycle processing in real time on the touch screen monitor. 2. Variable Cycle Programs and Self-Diagnosis Program This sterilizer has 6 kinds of basic cycle program for wrapped or unwrapped medical instruments, the product of synthetic resin, rubber, glass, textile and liquid in the glass container, 2 kinds of test cycle and the self diagnostic program which detects 12 cases of operating error during cycle processing, generates an audible warning and aborts the cycle automatically, displays the error code on the touch screen monitor.