General Tools and Instruments DREF-UP320 - Manual (Page 3)

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Ⅶ Zero Checking:
(This function is not available for DR101/201/301.)
1. Completely clear prism window.
2. Drop standard solution, which temperature is same as the tested solution, to fill
the prism window.
3. Press “Blank” button for Zero Checking. “zero check” will be displayed on middle right side of LCD.
Please be NOTICED:
If the test result exceeds the rang of accuracy, glint will be showed on LCD. Press
any key to exit status of zero-checking.
Ⅷ Measurement Procedure:
1 Completely clear prism window.
2 Drop one or two drops of solution which we want to measure to fill the prism
window.
3 Press “Mes” button.
Ⅸ Precaution:
1) Don’t expose the instrument to low, high temperature and sunlight for long time, to avoid LCD losing
effectiveness.
2) Because the instrument is very precise, it prohibited from violent shock.
3) To avoid damage, don’t disassemble and assemble the instrument or change the inner circuit and
parts.
4) Zero-setting should be implemented strictly according to instrument.
5) Be sure to clean the prism surface and window of stage before and after every measurement.
6) To avoid that accuracy is affected by evaporation, be sure to implement measurement immediately
after dripping solution on window of stage.
7) It can cause worry result if keep measuring under low voltage.
8) Don’t use it under the strong light (as sunlight, lamp etc.) and don’t use the instrument in the humid and
corrosive environment.
9) Prevent from liquid into battery house.