Hach-Lange DR 3900 User Manual - Manual (Page 34)

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Standard programs
9. Press OK.
The operator ID is displayed with the selected security level.
10. Activate the selected operator ID by pressing Login.
11. Enter the operator password.
12. Confirm with OK and return to "Instrument Setup".
5.2.4.2 Deactivate password
1. Press Security in the "Instrument Setup" menu.
2. Enter the security password and confirm with OK.
3. Press Off to deactivate the settings of the Security List.
4. Press OK and return to the "Instrument Setup" menu.
Note: Use this function to delete the former password or to enter a new
one.