Hach DR300 User Manual page 20

Set to the factory default calibration
To remove a user-entered calibration curve from the instrument and
use the factory calibration, do the steps that follow:
1. Push and hold
2. Push until "USEr" shows, then push
3. Push until "dFL" (default) shows, then push
Maintenance
Multiple hazards. Only qualified personnel must conduct the tasks
described in this section of the document.
Do not disassemble the instrument for maintenance. If the internal components
must be cleaned or repaired, contact the manufacturer.
Clean the instrument
Clean the exterior of the instrument with a moist cloth and a mild soap
solution and then wipe the instrument dry as necessary.
Clean the sample cells
Chemical exposure hazard. Obey laboratory safety procedures and
wear all of the personal protective equipment appropriate to the
chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
Chemical exposure hazard. Dispose of chemicals and wastes in
accordance with local, regional and national regulations.
Most laboratory detergents are used at recommended concentrations.
Neutral detergents, such as Liquinox, are safer to use when regular
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for 3 seconds to enter menu mode.
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