Instruction Manual

4. OPERATING INSTRUCTIONS

A. General Measurement

 To avoid damage, it is important to clean the

PRISM WINDOW before and after each use.

 Press the ON/OFF button to turn the

Refractometer ON. The unit will automatically

shut off after about 3 minutes of inactivity.

 Perform the Calibration Procedure (4B)

 With the unit on, fill the PRISM WINDOW with

the sample to be measured and then close the

COVER.

 Press the READ button immediately to ensure

accurate readings. Delays may cause the sample

to evaporate.

B. Calibration Procedure

 Clean the PRISM WINDOW before and after

each use.

 Fill the PRISM WINDOW with a standard solution

such as distilled or deionized water. The ideal

temperature of the solution and the unit should

be 65°~72°F (18°~22°C).

 Close the COVER.

 Press the ON/OFF button to turn the unit ON.

 Press the ZERO button for 3 seconds.

 When the procedure is complete, CAL will be

displayed.

 To check the nD value, press the ZERO button

once.

 This data can be viewed at any time to show the

last calibration value.

 A flashing crosshair symbol is displayed when

the calibration solution falls outside the accepted

range.

C. Zero Checking

 Fill the prism window with distilled water solution

that is at the same temperature as the solution to

be tested.

 Close the COVER