4
3. OPERATING INSTRUCTIONS
3-A. General Measurement
•
To avoid damage, it is important to clean the
PRISM
WINDOW
before and after use.
•
Press the
ON/OFF
button to turn the Digital Refractometer
on. The unit will automatically shut off after about 3
minutes of inactivity.
•
Perform the
Calibration Procedures
(below).
•
With the unit on, fill the
PRISM WINDOW
with the sample
to be measured, then close the
COVER
.
•
Press the
READ
button immediately to ensure accurate
readings. Delays may cause the sample to evaporate.
3-B. Changing the Temperature Scale:
With the unit on,
press the
FUNC
button as needed until
l.P C
(or
F
) is
displayed. Press the
SCALE
button to view the temperature
in Fahrenheit (or Celsius). Press the
READ
button to exit.
3-C. Automatic Temperature Compensation (ATC):
This
feature makes manual temperature correction unnecessary.
However, to obtain precise readings the sample and the unit
should be at similar ambient temperatures. ATC appears on
the LCD when this function is activated. To set the ATC
function, press the
FUNC
button as needed until
ALC.Y
(or
n
)
appears. Press the
SCALE
button to toggle between on or
off. Press the
READ
button twice to exit.
3-D. Calibration Procedures
•
Clean the
PRISM WINDOW
before and after every 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.
