Thermocouple Grounding in Retort Pouches

摘要

ABSTRACTFour different types of thermocouples and three different grounding methods were evaluated to determine the most consistent and accurate temperature response in heat penetration tests of pouches in pressurized water and steam‐air retorts. Criteria for evaluating the response were the residual sum of squares from nonlinear regression analysis and Fh and Fc values derived from the heat penetration data. Temperature measurement errors were found using both types of heating media for certain thermocouple types and grounding methods, while cooling data was found to be acceptable for most combinations. The best response was found with a thermocouple shielded with a stainless steel tube in which the measuring junction was electrically isolated from the sheat