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AX-4030
AUTION MAX AX-4030 OPERATING MANUAL
F
S.G. Calibration2.5
Perform S.G. calibration of the instrument once a month using low and high S.G. standard solutions
and a urinometer. Please ensure the urinometer conforms to the Brix – S.G. conversion formula
described in “1.1.4 Measurement Principle” on page 1-7.
2.5.1 Preparing S.G. Standard Solutions
Prepare: Saccharose, purified water, urinometer, two sample tubes,
sample rack (item rack, STAT and control rack, start rack, or normal rack)
IMPORTANT: Use S.G. standard solutions that meet the following requirements unless
preparing the solutions in steps 1 and 2 .
• Specific gravity readings are between 1.000 to 1.050.
• Difference between the S.G. readings of the high and low solutions is 0.03 or higher.
IMPORTANT: Prepare the S.G. standard solutions just before carrying out calibration. Use
of solutions stored for a long period of time may produce incorrect calibration results.
1 Prepare a low solution.
Use purified water as a low solution.
1 Transfer at least 2 mL of purified water into a
sample tube. Ensure the water level is at least 40
mm above the bottom of the tube.
IMPORTANT: An insufficient amount of low
solution may cause incorrect calibration
results.
2 Prepare a high solution.
1 Add purified water to 9.3 g of saccharose to make 100 mL of high solution.
3 Take specific gravity readings.
1 Use the urinometer* to accurately measure the S.G. values of the low and high solutions, and
record the values.
* The urinometer should conform to the Brix – S.G. conversion formula described in “1.1.4 Measurement Principle”
on page 1-7. When the high solution prepared in step 2 is measured using the urinometer, the S. G. value should be
1.040.
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