Abstract: Systems and methods are described for logging parameter data in autoclave operating cycles. The system has capacity to compensate the response delay to thereby accurately track the ambient gas parameters, such as temperature, pressure, humidity, sterilization gas density, within the autoclave during operation. By properly correcting for the thermal delay, the data accuracy of the measured gas temperature is thus greatly enhanced. Methods for evaluating and verifying autoclave operation cycle are also described. Furthermore, the system may also be used for autoclave pre-maintenance and performance trend analysis.