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15. Setting the Temperature Correction Values
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About temperature correction
The Refractive Index of every substance varies with the temperature. When
measuring the Refractive Index of a liquid with a refractometer, the measurement
value will also vary according to the sample temperature.
The instrument detects the temperature of the prism, and the Brix(%) indication
values are automatically corrected based upon the preset temperature correction
values. When the sample temperature is within the range of 5 to 100˚C, the Brix(%)
values are automatically compensated for temperature.
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Setting the temperature correction values for the instrument
When the instrument is shipped from the factory, the temperature correction values
for sucrose have been set as the default.
(
C
Table 15-1 page 31)
Table 15-1 lists the temperature correction values for temperatures between 15 to
40˚C.
However, temperature correction values for 5 to 100˚C have been set on the
instrument.
If sugar is the main constituent of soluble solids in the sample, these values can be
used as they are.
If the temperature correction factor is changed inadvertently, refer to page 32
"Inputting the temperature correction factor". By utilizing these instructions, it is
possible to set the temperature correction factor back to "1.00".
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Setting procedure
If the main constituent of the sample is not sucrose, a different temperature
correction value must be set. To set a new temperature correction value, you must
determine the relationship between the temperature correction factor for sucrose and
your desired sample. The temperature correction factor for sucrose is 1.00. When a
new temperature correction factor is input, this factor is multiplied by the temperature
correction factor for sucrose.
The temperature correction factor can be set in the range of 0.80 to 5.00.
EXAMPLE :
If the Refractive Index variation of a sample due to temperature is 3 times larger than
that of sucrose, the temperature correction factor should be set to 3.00.
