A unique self-contained data acquisition unit consisting of multiple sensing elements and recording electronic components installed in a heat resistant capsule is currently being developed at SUWIC. This unit can be introduced into a process system with the raw feed material and experiences the same conditions as the material being processed, as it simultaneously measures the temperature, gas compositions and heat fluxes in the system. At the end of the process, the instrument can be recovered, and the data recorded and stored in its memory unit downloaded to a computer. This instrument is applicable to pyre-processes such as incineration, power generation and steel processing, as well as to the food industry.