in the process of heating the wood at least three data loggers must be present at all times that read temperatures with and accuracy of u2032 t 0 5 degrees f therefore in a typical protocol wireless sensors would be placed in wood pieces that are spread apart on the conveyor in such a way that when a wood piece containing wireless sensors exits the chamber a wood piece containing a wireless sensor enters the chamber at the entrance side a frequency drive capable of moving the conveyor at relatively low speeds while maintaining the speed of the conveyor relatively constant is preferably used to allow the interiors of the wood pieces to reach the threshold temperature and to hold them at that temperature for the threshold time period a combination of sufficient chamber length conveyor speed and chamber interior temperature must be provided the chamber length may range from 15 0 to 100 0 feet and conveyor speed may range from about 0 15 feet per minute to about 1 0 feet per minute this provides at least 100 minutes of residence time in the chamber to ramp up the temperature in the wood interior to the threshold level and maintain it for the threshold time period in an embodiment of the present invention the chamber length is about 20 0 feet thus a conveyor speed of 0 2 feet per minutes provides a total dwell time in the.