Sper Scientific 300055 Digital Refractometer Automotive - Manual (Page 6)

- 6 -
• Allow the refractometer and the distilled
water to acclimate to the ambient
environment.
• Clean the PRISM (3) before and after
every use. There should be no spots or
film on the prism.
• Drop at least 1.0 ml of distilled water (0.0)
onto the PRISM (3).
• Close the COVER (2).
• Press the READ (9) button to turn on the
refractometer.
• Press the ZERO (10) button for 3 seconds
to enter calibration mode.
• "CAL" flashes on the display. There will
be a red flash in the PRISM (3).
• The calibration is complete after "End" is
displayed.
5. MEASUREMENT
• Clean the SAMPLE PLATE (1) and
PRISM
(3) before and after every use.
There should be no film or spots on the
prism. If residue remains from a previous
test, it will affect the accuracy of the unit.
• When the temperature difference between
the ambient temperature and the
refractometer is greater than 10°F (5°C),
- 7 -
place the refractometer in the lab and
allow it to adjust to the ambient
temperature. Allow apx. 30 minutes for
every 5°F (10°C)
difference in temperature.
• Press the READ (9) button to turn the unit
on and display the temperature. This unit
features Automatic Temperature Compen-
sation (ATC) within the range of 41~104°F
(5~40°C), eliminating the need for manual
temperature correction.
• Perform a calibration (pg 6) before the
day's first use or after extended daily use.
• Fill the PRISM (3) with about 1.0ml of the
sample solution.
• Close the COVER (2).
• Press the READ (9) button immediately to
obtain a reading. Delays may cause the
sample to evaporate.
• Within 1 second, the value is displayed.
• When the reading is under-range, the low
indicator (LLL) is displayed. The high
indicator (HHH) is displayed when the
reading is over-range.
Models with Multiple Scales
• Follow the measurement instructions