7. Maintenance
50
7. Maintenance
Since such precision scientific instrument like density meter is liable to be
affected by how, where and for what application the unit has been in use.
Therefore, daily and periodic maintenance is necessary as prescribed below.
7-1. Check list
Below is the list of daily and periodic maintenance for your information.
Daily check
Daily check is necessary to make sure of correct measurement in practice before an
actual sample is tested first in the morning for the day’s work.
Periodic check
Periodic check is required in order to maintain standard criteria of performance
and functions of the instrument once a year. When the unit is verified and
validated by a KEM authorized service person, a JCSS-accredited certificate of
calibration is issued.
Daily/Periodic check list
(before measurement)
Check item
Daily Periodic
Criteria
Auto scanning
Yes
Yes
When the power is turned on, the opening
message appears without error.
When an error should be found, refer to
8-1. Troubleshooting.
Check/Calibration
Yes
Yes
Oscillation by check/calibration does not
change for a time (the same direction).
It may change with corrosive liquid (strong
alkali or hydrofluoric acid) in contact.
See 4. Calibration for how to check.
Dustproof filter
Yes
Yes
No dust accumulation is observed on the
filter.
See 7-2. Maintenance.
Silica gel
Yes
Yes
Silica gel must be blue in colour.
See 7-2.
Maintenance
Sampling pump
Yes
Yes
Pure water is taken in without problems like
slow flow or leak from deterioration.
See 7-2. Maintenance for how to replace
pump tube.
Tube connection
Yes
Yes
Sampling tube, drain tube, vent tube, etc.
are connected securely.
Vent tube
Yes
Yes
Vent tube exhausts air in normal condition.
Tube lines
Yes
Yes
No bent, dent or any damage is observed.
Sampling speed
Yes
Yes
Sampling speed changes by the speed
controller.
Summary of Contents for DA-640
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