Hanna Instruments HI 901 - Manual (Page 115)

9-5
MAINTENANCE, PERIPHERALS
To attach the burette to the pump simply slide the burette into the pump support as shown
in the figure presented in 9.1.2 Burette Changing section.
9.1.5 Cleaning Burette
To clean the burette, follow these steps:
• If the burette is filled with liquid, remove the aspiration tube from the titrant bottle
and execute purge burette operation (see 8.1.4 Purge Burette section).
• Insert the aspiration tube into cleaning solution and/or into deionized water or
titrant solvent, depending on the chemical nature of titrant and the intended use of
the burette. If a titration will follow, use titrant solvent to clean the tube.
• Execute prime burette operation to fill the burette (use 2 rinses) (see 8.1.1 Prime
Burette section).
• During second refilling of the burette remove the aspiration tube out of the solvent
beaker and allow the air to replace the liquid in the burette. This will clean the
aspiration tube.
If this simple cleaning procedure is not adequate for the desired purpose, continue with
these steps:
• Slide the burette out from the pump assembly.
• Remove the tubes with the special mounting tool (tool for valve fitting and burette
cap removal).
• Clean them separately or insert new ones.
• Remove the protective cap from the bottom by using the special tool.
• Remove the protective plastic shield.
• Remove the syringe from the burette assembly by unscrewing it with your fingers.
• Extract the piston from the syringe.