Hach-Lange DR2800 eco - Manual (Page 46)

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Advanced Operations
6.1.6 Factory service
The Factory Service menu is password protected. This menu is not
intended for customer use.
6.1.7 Service time
In order to ensure a regular inspection, an automatic memory
reference for the service times can be entered. After switching the
instrument on this memory reference will be activated and indicated
at the appropriate time.
1. Press Service Time in the System Checks menu.
2. Select On and then Last Service to enter the date of the last
inspection.
3. Press OK to confirm.
4. Select Next Service to determine a specific period of time up to
the next inspection.
5. Press OK to confirm.