Hach DR 1900 User Manual page 4

Table of Contents
Do a stray light check ..................................................................................17
Do an instrument verification .......................................................................18
Update the firmware ..................................................................................................18
Maintenance
...............................................................................................................18
Clean the instrument .................................................................................................. 18
Clean the cell compartment .......................................................................................18
Clean the sample cells ............................................................................................... 18
Replace the batteries .................................................................................................19
Troubleshooting
Replacement parts and accessories
2
.......................................................................................................19
............................................................... 19