Hach-Lange ULTRATURB sc basic_plus_seawater - Manual (Page 21)

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Section 5 Maintenance
It has been possible to reduce the scope of the maintenance to be performed by
the user to only a few actions. Clearly summarised in a table and described in
detail in the following sections, these actions can be quickly and straightforwardly
performed by qualified personnel.
5.1 Maintenance schedule
5.2 Cleaning measuring chamber
The cleanliness of the measuring chamber is crucial for correct measured results.
This cylindrical optical measuring chamber has a rotating wiper with three wiper
profiles (only on plus and seawater version); these prevent normal soiling of the
optical system as it starts to build up. With very stubborn deposits, manual
cleaning with a suitable cleaning agent (e.g. citric acid) is recommended.
CAUTION
Observe safety regulations and wear safety clothing!
• Safety glasses
• Gloves
• Overalls
1. Open the MAIN MENU.
2. Choose SENSOR SETUP and accept.
3. Choose the related sensor and accept.
4. Choose TEST/MAINT and accept.
5. Choose MAINT. PROC and accept.
6. Choose CLN. MEAS CHAMB and accept.
7. Shut-off the feed and accept TURN OFF SAMPLE INLET.
8. Drain the measuring chamber via the lower feed union and accept DRAIN
MEAS. CHAMBER.
Maintenance task Interval
Clean measuring chamber:
Dependent on the substances contained
in the water
Replace wiper profile
(only plus and seawater version)
After 1200 cycles
Replace desiccant Every 2 years
Monitor test equipment (CVM dry
standard) Every 2 years
(factory test with certification)
Check zero point
Dependent on the substances contained
in the water
Check gradient At least once a year