Hach NT3100sc User Manual page 19

Normal operation of this device may require the use of chemicals or samples that are biologically
unsafe.
• Observe all cautionary information printed on the original solution containers and safety data
sheets prior to their use.
• Dispose of all consumed solutions in accordance with the local and national regulations and laws.
• Select the type of protective equipment suitable to the concentration and quantity of the dangerous
material being used.
If the wiper interval is correctly set for the application and the wiper profile is replaced regularly, more
cleaning of the measuring path is not necessary.
1. Go to the main menu, then select Sensor setup.
2. Select the applicable sensor, if necessary.
3. Select Maintenance.
4. Set the outputs on Hold.
5. Remove the probe from the tank or flow through unit.
6. Go back to the sensor menu, then select Diagnostics/Test > Signals.
7. Rinse the probe with clean water.
As an alternative, use a window cleaner, grease remover or 5 % hydrochloric acid to clean the
measuring path based on the quantity and type of contamination. Soak the probe in the cleaning
solution for 5 to 10 minutes.
8. Carefully clean the measuring path with distilled water.
Clean the measuring path until the DExt1 and DExt2 values are less than 15.
9. Select Back to go back to Diagnostics/Test.
10. Select Back again.
11. Select Return sensor to process.
The probe goes back to measurement mode after the automatic wipe cleaning.
12. Install the probe in the tank or flow through unit.
6.3 Replace the wiper blade
Replace the wiper blade when one or more of the conditions that follow occurs:
• After 25,000 cleaning cycles (A-B-A or B-A-B)
• After 50,000 cleaning single movements (A-B or B-A)
• if the wiper blade has damage or does not operate correctly.
1. Remove the probe from the tank or flow through unit.
2. Go to the maintenance menu as follows:
• SC200 and SC1000 Controllers—Go to the main menu, then select Sensor setup >
Maintenance.
• SC4500 Controller and Claros interface—Push the tile of the device and select Device menu >
Maintenance.
3. Select Wiper replacement.
4. Complete the instructions on the display. When asked, replace the wiper blade. Refer to the
illustrated steps in Figure 8 and Figure 9.
English 19