Hi.
To encrypt the data from the logger, you need to enter an encryption PIN. Press [HOME][4][3][6] on the logger's keypad, then enter a four-digit PIN number.
Store the PIN in a safe place - you will not be able to read the encrypted data without it!
There is more information on encrypting data on page 28 in the SymphoniePLUS manual, available in the Tech Support section of our customer website:
http://www.nrgsystems.com/FileLibrary/ac370436ebac46b3b3aaeaf00db344c1/NRG_SymphoniePLUS_Data_Logger_Manual_-_Rev_1.01.pdf