Maintenance
49
5. Restore sample flow to the instrument.
6. Calibrate the instrument using one of the methods in section 5.3 on page 40.
If the above cleaning procedures have been performed and the turbidimeter
readings are still noisy, the bottom plate and gasket may need to be removed and
cleaned. Carefully perform the following procedure to ensure the turbidimeter
body integrity is maintained.
1. Turn off sample flow to the turbidimeter body.
2. Remove the head assembly, bubble trap cover, and bubble trap (by lifting it
vertically) from the body.
3. Drain the body by removing the plug from the bottom of the body.
4. Lift the body off of its mounting screws.
5. With the body turned upside-down, remove the two Phillips-head screws
holding the bottom plate.
6. Lift the bottom plate off the body; set the gasket aside for use in reassembly.
7. Use a soft brush and a dilute cleaning solution (as prepared above) to clean
the bottom plate and inside surfaces of the turbidimeter body. Rinse the entire
body and bottom plate with ultra-filtered deionized water.
8. Reassemble by inserting the gasket into the molded channel in the
bottom plate.
9. Fit the bottom plate onto the turbidimeter body.
10. Reinstall both screws and carefully tighten to 15 inch-lb maximum.
11. Reinstall the turbidimeter onto the wall mounting screws.
12. Replace the bubble trap, bubble trap cover, and head assembly on the top of
the body.
13. Restore sample flow to the instrument.
6.4.4 Replacing the Lamp Assembly
The Lamp Assembly is located on the head assembly. Under normal use, Hach
recommends replacing the lamp once a year to maintain peak performance.
Replacement bulbs have been “burned-in” at the factory and are ready for
installation and use.
To change the lamp, refer to Figure 28 on page 50 and perform the
following steps:
1. Disconnect power to the controller to remove all power to the turbidimeter.
2. Disconnect the lamp leads by unplugging the connector.
3. After the bulb has cooled, remove as follows:
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