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SECTION 4 MAINTENANCE
4.1 Cleaning
Keep the turbidimeter and accessories as clean as possible and store
the instrument in the carrying case when not in use. Avoid prolonged
exposure to sunlight and ultraviolet light. Wipe spills up promptly.
Wash sample cells with non-abrasive laboratory detergent, rinse with
distilled or demineralized water, and air dry. Avoid scratching the cells
and wipe all moisture and fingerprints off the cells before inserting
them into the instrument. Failure to do so can give inaccurate readings.
See Section 2.3.1 on page 23 for more information about sample
cell care.
4.2 Battery Replacement
AA alkaline cells typically last for about 300 tests with the signal
averaging mode off, about 180 tests if signal averaging is used.
The “battery” icon flashes when battery replacement is needed. Refer
to Section 1.4.2 on page 15 for battery installation instructions. If the
batteries are changed within 30 seconds, the instrument retains the latest
range and signal average selections. If it takes more than 30 seconds,
the instrument uses the default settings.
If, after changing batteries, the instrument will not turn off or on and
the batteries are good, remove the batteries and reinstall them. If the
instrument still won't function, contact Hach Service or the nearest
authorized dealer.
4.3 Lamp Replacement
The procedure below explains lamp installation and electrical
connections. Use a small screwdriver to remove and install the lamp
leads in the terminal block. The instrument requires calibration after
lamp replacement.
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