Maintenance Schedule - Hach FT660 sc Manuel D'utilisation De Base

• Operator initials
• Date and time
A calibration history entry shows the:
• Gain value
• Operator initials
• Date and time
Notes:
• History data is saved as first in, first out. When a history log is full, the newest entry is saved and
the oldest entry in the log is deleted.
• When the instrument is received from the factory, default values or blank spaces are shown for the
history information. Those values are replaced with real data as the history log is filled.
Maintenance
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.

Maintenance schedule

The laser module and detector system are not user-servicable items. Contact Technical Support for replacement.
Clean the instrument at least once a month. The instrument may need to be cleaned more frequently
depending on water quality.
Clean the instrument
Do not remove the bottom plate of the instrument or drain plug when the head assembly is installed
and the instrument is in operation. Risk of exposure to Class 3B Radiation will result.
Personal injury hazard. Never remove covers from the instrument. This is a laser-based instrument and the user
risks injury if exposed to the laser.
Sediment of the size that passes through with filter effluent is difficult to see. Reading accuracy may
be affected if the instrument is not cleaned at regular intervals. Noise (fluctuation) in the reading may
indicate the need to clean the instrument.
Refer to the illustrated steps to clean the instrument.
Make sure to remove debris from internal corners and other internal areas that are difficult to access.
Do a calibration verification after this procedure is complete if a calibration will not be done
immediately.
Required tools and materials:
• Soft brush
• Test tube brush
• Cleaning solution (25 mL of household bleach in 3.78 L of water or 1 mL laboratory detergent (i.e.,
Liqui-nox) in 1L of water)
• Water that is less than 50 mNTU (0.05 NTU)
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