Hach-Lange DR1900 User Manual - Manual (Page 4)

Do a stray light check ..................................................................................18
Do an instrument verification .......................................................................18
Do an analytical quality assurance .....................................................................18
Update the firmware ..................................................................................................18
Maintenance
...............................................................................................................19
Clean the instrument .................................................................................................. 19
Clean the cell compartment .......................................................................................19
Clean the sample cells ............................................................................................... 19
Replace the batteries .................................................................................................19
Troubleshooting
.......................................................................................................20
Replacement parts and accessories
...............................................................20
Table of Contents
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