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CALIBRATION: ZERO SET
The refractometer must be set to zero before initial use and periodically
thereafter. It is recommended that calibration be performed at least
once a day as well as prior to performing tests requiring the highest
precision, or when moving between environments with extreme
changes in ambient temperature. A clean container of water is all that
is needed to automatically calibrate the instrument. Although tap water
may be used, distilled or deionized water is recommended. The water
temperature for calibration should ideally near 68°F (20°C).
1. Inspect the measuring surface to make sure
it is clean and dry.
2. Place a few drops of calibration liquids on the
prism window, making sure to eliminate any
bubbles.
3. Press to start calibration.
4. The unit shows the process of zero setting
(Fig 2.1).
5. If calibration is successful, it will show “Pass”
(Fig 2.2).
6. If calibration is not successful, it will show “Fail”.
7. After calibration process is finished, the LCD will
return to temperature mode. The calibration result
will be saved and will be the new zero point after
the device is powered off and on again.
Note: After calibration, please remember to clean the liquid from
the prism surface and keep the prism surface dry and clean to
avoid erosion.
MEASUREMENT
1. Make sure the prism surface is clean and dry.
2. Place a few drops of the sample on the prism.
3. Press key, “---” will be shown on the screen.
– Test result(s) will be shown on the screen
(Fig 3.1).
– The result(s) will be stored in the device
for up to 60 seconds.
– Press the “Power” button to recheck the previous measurements.
4. After testing, please remember to clean and dry the surface when
you are done.
Scale Selection
1. Hold
for 2 seconds, the scale will change to
the next measurement type (Fig 4.1).
2. Repeat Step 1 until desired scale is shown
on the screen.
3. The device saves the last selected scale.
Temperature Selection
1. Hold
for 2 seconds, the temperature unit will change between
°F and °C.
2. The device saves the last selected temperature unit.
Resetting
1. Press
+ , the option of returning to factory
setting of zero will be shown on the screen
(Fig 5.1).
2. Press
button to confirm resetting, or
press to cancel.
Fig 2.1
Fig 2.2
Fig 3.1
STATUS
1. Press to turn on the device.
2. Press
to turn off the device; the LCD will
show the process (Fig 6.1).
3. To conserve energy, the device enters Sleep
Mode after standing by for more than 60 seconds.
Press to wake up the device.
4. The refractometer will turn off after 90 seconds of nonuse.
TROUBLESHOOTING
Zero setting error (Fig 7.1)
– Out of calibration (zero set) range.
Action needed: Make sure there is a sufficient
amount of clean calibration water to cover the
prism surface.
Measurement Errors
– High – exceeds the specified measurement range
(Fig 7.2).
– Low – falls below the specified measurement range
(Fig 7.3).
– Error – no liquid on the prism or not sufficient
amount of liquid (Fig 7.4).
Temperature errors
– High – temperature exceeds range (Fig 7.5).
Action needed: Check temperatures of the sample
liquid, the device, and the ambient surroundings.
– Low – temperature falls under range (Fig 7.6).
Action needed: Check temperatures of the sample
liquid, the device, and the ambient surroundings.
Battery Error
– Low – battery indication (Fig 7.7).
Action needed: Replace with two new AAA batteries
when the battery icon is red.
Fig 4.1
Fig 5.1
Fig 6.1
Fig 7.1
Fig 7.2
Fig 7.3
Fig 7.4
Fig 7.5
Fig 7.6
Fig 7.7
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