Hach TU5 Series User Instructions page 15

Clean the instrument
Clean the exterior of the instrument with a moist cloth, and then wipe the instrument dry.
Replace the vial
Keep water out of the vial compartment or instrument damage will occur. Before the automatic cleaning module is
installed on the instrument, make sure that there are no water leaks. Make sure that all tubing is fully seated.
Make sure that the vial nut is tight.
Hold the automatic cleaning module vertically when it is installed on the instrument or the vial can break. If the vial
breaks, water will get in the vial compartment and instrument damage will occur.
Do not to touch or scratch the glass of the process vial. Contamination or scratches on the glass can cause
measurement errors.
Note: Make sure that no particles fall into the vial compartment.
1. Push menu.
2. Select SENSOR SETUP>DIAG/TEST>MAINTENANCE>VIAL REPLACEMENT.
3. Complete the steps that show on the controller display. The date the vial was replaced is
automatically saved after the last screen shows.
Refer to the illustrated steps that follow to replace the vial. To protect the new vial from
contamination, use the vial replacement tool to install the vial.
At illustrated step 3, put the automatic cleaning module on its side on a flat surface if a service
bracket is not installed near the instrument.
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