The CDP800 unit has been designed to perform the on-line density profile analysis on wood based panels while the production process is in progress. The system exploits the theory adopted in X-ray operated systems to conduct a non-destructive test on the board produced. Both the transmitter and X-ray receiver are mounted below the board to prevent them from being affected by any potential overheating and to ensure that transmitter and receiver are perfectly aligned, preventing issues related to thermal dilation.