Thermo Fisher Scientific Alpha CON 100 - Manual (Page 11)

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To calibrate the controller at any time, you may have to enter
the password that you set, in order to access the calibration
mode. Once you have entered the password correctly, the
display shows "CAL COn” indicating that you are in one of the
lower-level SETUP menus.
If you enter the wrong password, the display reverts back to the
Conductivity display. Alternatively, if you prefer no password
protection, set the password to “000”, "CAL COn" immediately
displays after you press ENTER key while you are in the "SEt"
menu.
NOTE : The user set password is a protection code. Thus, it is
very important to keep this password strictly confidential to
authorized personnel. You are advised to remember the
password that you have set, in order to protect the controller
settings and prevent any unauthorized tampering to the system!
IMPORTANT : In case the password set is forgotten, use
the master password “555”.
4.1.2 Changing the Password
Enter the Set id menu with already set password or “555”.
Change a new password as per steps mentioned for setting the
password.