Twilight Palette Series, Инструкция по эксплуатации

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14. Inspecting this instrument
Inspect the instrument to see if it displays the measured value correctly. Perform the
inspection periodically, e.g. once a month, also when the main unit of the instrument was
subjected to a strong impact or vibration or a measured value is different from the usual
measurement. For the inspection, use the standard sucrose solution besides purified water and
the standard liquid. Standard sucrose solutions are available from ATAGO.
Part No. Name
RE-110010 Sucrose Solution 10%（±0.03％）
RE-110020 Sucrose Solution 20%（±0.03％）
RE-110030 Sucrose Solution 30%（±0.03％）
RE-110040 Sucrose Solution 40%（±0.04％）
RE-110050 Sucrose Solution 50%（±0.05％）
Inspection of the instrument with standard sucrose solution
① Prepare the instrument and perform the operation before starting measurement
(according to the instruction manual).
② Using purified water left at room temperature, perform zero adjustment correctly.
※
For the PR-301α, use the standard liquid included with the instrument and calibrate
the instrument in an environment between 18 to 25℃.
③ Measure the Brix of the standard sucrose solution (about 5 times repeatedly).
④ If the deviation of the value of the standard sucrose solution indicated by the instrument
is ±0.1%, the operation of the instrument is normal. If the deviation is ±0.2% or larger,
check the purity of the sucrose, method of preparation of the sucrose solution,
measuring method, etc., then repeat the inspection.
⑤ If the deviation is still ±0.2% or larger, contact your ATAGO distributor.
※How to make standard sucrose solution (20.0%)
Use the following steps to make a standard sucrose solution.
m Make standard sucrose solution at a temperature of 20℃±5℃.
m 10.0%, 30.0%, 40.0%, and 50.0% sucrose solutions can also be made by using the same procedure and
changing the ratios. To inspect the PR-301α, prepare a 50.0% sucrose solution (when making a
sucrose solution of 50.0%, stir the solution well so that the sucrose will be completely dissolved).
① Items to be prepared
 20g of sucrose of special grade
 80g of purified water
 Direct-reading balance (Weighing capacity: Min. 200g, Accuracy:
±
0.005g)
 100mL beaker (Made of glass or polyethylene)
 Spoon (Made of plastic)
② Procedure

Place the beaker on the balance and set the indication of the balance to 0.00g.
 Put 20.00g of sucrose in the beaker.
 Add 80.00g of
purified
water to the sucrose so that the total weight will be 100.00g.
 Take down the beaker from the balance and stir the mixture well until all the sucrose
is dissolved.
③ Precautions for making the standard sucrose solution

The unit of Brix of the refractometer is weight/weight%.
 The sucrose solution should be made so that its total weight will be 100% (If the total
weight is less than 100g, the relative error is increased).
 Keep the prepared sucrose solution in a sealed container.
 Purchase sucrose from a reagent shop, drug store or pharmacy.