![ATAGO 3564 Instruction Manual Download Page 34](http://html.mh-extra.com/html/atago/3564/3564_instruction-manual_2995847034.webp)
33
●
Obtaining the temperature correction factor for a sample whose main
constituent is other than sugar
①
Measure tap water and ensure that the Brix(%) value is 0.0%. If tap water does not
read 0.0%, see page 29, section "14.Adjusting to the Reference".
②
Let the sample to be measured continuously run across the prism surface.
Be sure to keep the sample temperature CONSTANT at less than 15˚C, or greater
than 25˚C.
③
While letting the sample run, follow the directions on page 32 to display the
temperature correction factor. Make sure this reads 1.00.
④
After the temperature correction factor is verified, return to the Brix(%) display.
Note the Brix(%) value (A value).
⑤
Return to the temperature correction factor screen and adjust the temperature
correction factor to 4.00.
Return to the Brix(%) display and note the Brix(%) Value (B value).
⑥
The temperature correction factor for the sample can be obtained using the following
formula:
C value = true value
-
A value
D value = true value
-
B value
D value
-
(C value×4)
Factor =
D value
-
C value
⑦
Set the obtained temperature correction factor according to the procedure described
on page 29 (Any value in the range of 0.80 to 5.00 can be set as the factor).
N
To obtain the true value [Brix(%)] of the sample, measure the sample with a
benchtop refractometer that can control the temperature (through a waterbath or
Internal Peltier Thermo-module).
The temperature should be 20˚C.
Example of procedure
①
Let tap water run and adjust the Brix(%) value to 0.0%.
②
Keep the sample less than 15˚C or greater than 25˚C.
③
Adjust the temperature correction factor to 1.00.
④
When returning to the Brix(%) value, 43.0% is displayed. This is the A value.
⑤
Adjust the temperature correction factor to 4.00.
⑥
Now, the Brix(%) value is 45.4%. This is the B value.
⑦
When measuring the sample with a benchtop refractometer at a constant temperature
of 20
℃
, the true value is 45.0%.
⑧
To obtain the temperature correction factor from the above example:
C value = true value - A value = 2.0
D value = true value - B value = -0.4
-0.4 - (2.0×4)
Temperature correction factor =
-0.4 - 2.0
= 3.5
⑨
For this sample, the temperature correction factor should be set to 3.50.