Shimadzu MOC-120H, Instruction Manual

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11. Precaution on Conducting Measurements
Precaution on conducting multiple measurements in succession
Placing a sample on the sample pan which is already warm may cause moisture from the sample to
evaporate before measuring is begun and causes errors in measurement result. Always be sure to
use a cool sample pan when performing a subsequent measurement.
Allow an even amount of time to elapse between measurements, as errors may occur if the
temperature of the balance mechanism varies.
* Two sample pans and two sample pan handlers are provided for use when conducting multiple
measurements in succession.
Use of sample pan and aluminum foil sheets
It is impossible to obtain accurate measurements if any of the last measured sample remains on the
sample pan. To avoid errors, either wipe the sample pan clear of any remaining sample (see “15.
Maintenance” on p. 58 for further instructions) or use disposable aluminum foil sheets.
* Twenty disposable aluminum foil sheets are included with the unit.
Quantity and placement of powdered, particulate and viscous sample materials
Samples cannot be heated properly if they are not placed flatly. Placing samples in mounds or in
layers of varying thickness may result in the highest points being burned. accurate measurements.
The precision of measurement improves when the samples are flatly and evenly placed and the
amount of sample are larger. However, too large sample amount results in uneven heating. Make
certain samples are placed correctly.
Measuring liquid samples
Since most liquid samples harden and become sticky after drying, it is recommended to use the
aluminum foil sheets when measuring such samples. Note that the aluminum foil sheet is water-
wettable, thus making it possible to obtain wide and even sample placement and effective in
shortening measuring times and obtaining accurate measurements.
Depending on the sample, the use of sand to speed up drying (Silica sand or ocean sand with a
mesh of 20 or so).
Proper placement Incorrect placement
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