4
OPERATING INSTRUCTIONS
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.
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.
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
•
With the unit on, press the
ZERO
button. A refractive
index reading between 1.3329 ~ 1.3331 indicates that
the unit accurately reads to the calibrated zero point.
•
If the unit is out of range, a flashing crosshair symbol will
be displayed, indicating that recalibration is required.
