Twilight Palette Series, Instruction Manual

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18
12. Methods of measurement for special samples
(1) High/low temperature samples
This instrument is equipped with a
temperature sensor under the prism
and it detects the temperature of the
prism for automatic temperature
compensation.
In case of the Table 12-1, it takes
about 30 seconds until the sample
temperature becomes approximate to
the prism temperature as shown at
right. If this sample is
Table 12-1: Changes in prism and sample
temperature
Example: Applying a 10℃ sample to a 30℃ prism
measured within 30 seconds after it is dripped on the prism surface, the measurement may
result in an error due to temperature difference. Although this instrument automatically
compensates sample temperature by the function of the built-in temperature sensor and it
indicates a compensated value in Brix(%), this instrument fails in temperature
compensation if there is a considerable difference between the sample temperature and
prism temperature.
Method of Measurement
1
Apply a sample on the prism surface.
2 Depending on the difference in temperature, allow the sample to sit
for 20 to 60 seconds (to acclimate to the instrument's temperature).
N Gently stirring 3 to 4 times with a plastic spoon will allow the sample to
acclimate more quickly.
3 Press the START/OFF Button.
(2) High viscosity sample
Examples: Thick sauce, ketchup, jam, honey and syrup (high
fructose corn syrup).
Be sure to stir of high viscosity sample well to make it
homogeneous before applying it to the prism surface, or
measurement values of such sample will be poor in reproducibility
and it may be become difficult to identify a correct value.
Method of Measurement
1
While stirring, transfer about 10mL of sample to a separate
container (cup or beaker).
2 Apply the sample to the prism after mixing further.
N Place an adequate amount of sample.
N Air may be trapped between the sample and the surface of the prism. Stir 4 to 5 times using a
plastic spoon.
3 Press the START/OFF Button.
(3) Semisolid sample
Examples: Agar cake and jelly
Semisolid samples such as agar cakes and jelly have poor surface
contact with the prism. Placing such samples on the prism as-is may
result in unrepeatable measurement values.
Method of Measurement
1
Place a semisolid sample on the prism surface.
2 Gently press the sample with a plastic spoon to the prism for better adherence.
3 Press the START/OFF Button.
Sample temperature
Prism temperature