P-SOP0803-1410-E01
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Standard Operating
Procedure
（
SOP
）
Multi-Wavelength Abbe Refractometer
DR-M2
4. Calibration
1)
Carry out calibration once a year.
2)
Perform calibration in accordance with the performance test method of Operational
Qualification (OQ).
3)
Enter the data, and other information in a performance test report, and have the
operator performing the test and an manager confirm by signing the test results. You
may also request the manufacturer to perform the calibration.
5. Maintenance
1)
When measurement is completed, be sure that any sample on the prism surface and
surrounding areas are completely wiped off with tissue paper moistened with water,
then wipe dry with a soft,lint-free tissue.
2)
When the body of the instrument is dirty, wipe it off with dry tissue, cloth, etc.
3)
Place the refractometer at a designated location. If it is not to be used for a long
period of time, store the instrument in a place of relative humidity less than 75%.
4)
A Desiccant case is installed within the body of the DR-M2. If the indicator inside the
desiccant case changes from blue to pink, replace the desiccant, the indicator, and the
cushion with new ones.
6. In the event of a malfunction (failure)
When operational malfunction (abnormalities) of the DR-M2 occurs, check the operation of
the DR-M2 by the following procedure.
After turning on the DR-M2, check the technical malfunction by applying step 2. (Daily
check) and adjustment with distilled water and measurement of a solution (example: Brix
10%=nD 1.3478) of a known concentration.
6-1. Check Procedure
1)
Turn off the power supply switch of the DR-M2, and turn on again.
2)
Perform reference point adjustment with distilled water.
3)
Measure the solution (example: Brix 10%=nD 1.3478) of a known concentration.
In the above procedure, operational malfunction (abnormalities) can be checked or found.
Properly identify the situations of operational malfunction (abnormalities) of the DR-M2.
When calibrating the Multi-Wavelength Abbe Refractometer
DR-M2 at your facilities (end-user),
it is required to meet the strict conditions (maintenance, environmental conditions, examination
conditions, the accuracy of standard liquid, and the traceability of the jigs used) for calibration.
In order to calibrate the DR-M2 properly, enormous expense and time may be spent.
When the matter of expense is taken into consideration, an alternative is to request the
manufacturer to carry out calibration.
*In this case, contact the company where the refractometer was purchased.
