7. Maintenance
51
DA-650/-645/-640
Check item
Daily Periodic
Criteria
Temp stability
Yes
Yes
The difference between temperature
reading and set temperature must be within
the following ranges:
DA-650: ±0.02°C
(When set temp is 10~30°C.)
±0.05°C (whole range)
DA-645: ±0.03°C
(When set temp is 10~30°C.)
±0.05°C (whole range)
DA-640: ±0.05°C
Connecting cable
Yes
The connecting cables must be securely
connected in place.
Repeatability
Yes
The repeatability of measurement of air and
water is within specified range.
Linearity
Yes
When density standard liquids (pure
water, isooctane, 2,4-dichlorotoluene) are
measured, the difference of density
between measured and labeled must be
within specified range.
Viscosity correction
Yes
When density standard (e.g.: JS100, JS500)
is measured with viscosity correction, the
difference of results from label must be
within specified range.
Daily/Periodic check list
(after measurement)
Check item
Daily Periodic
Criteria
Cell cleaning
Yes
Yes
The cell must be clean after rinsed and
dried. See 3-2. Preparation.
Waste liquid
Yes
Yes
Waste liquid must not remain in bottle.
(Waste liquid must be discarded when it
occupies more than 60% of waste bottle.)
Taint on housing
Yes
Yes
Housing must not be dirty.
If dirty, wipe off with soft cloth wet with
neutral detergent. (Do not use solvent like
alcohol, acetone or thinner.)
Contact your local distributor when the results of daily or periodic check are found
to be deviated from specified range (accuracy).
Summary of Contents for DA-640
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