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OPERATION MANUAL
HAND HELD REFRACTOMETER
11-270
Parts Diagram:
Calibration
Scerw
Daylight
Plate
Focus
Adjustment
Main Prism
Assembiy
Rubber
Grip
Eyepiece
Operation Steps:
Step1.
Open daylight olate, ang place 2-3 drops of distilled water on the main
prism. Close the daylight plate so the water spreads across the entire
surface of the prism without air bubbles or dry spots. Allow the sample to
temperature adjust on the prism for approximately 30seconds before going
to step#2.(This allows the sample to adiust to the ambient temperature of
the refractometer)
Poor
Poor Good
Step 2.
Hold daylight plate in the direction of a light source and look into the
eyepiece. You will see a circular fi eld with graduations down the center.
(you may have to focus the eyepiece to clearly see the graduations). The
upper portion of the fi eld should be blue, while the lower portion should be
white. (The pictures shown here and shown in step 3.& Step 4. are only as
reference, the right specifi c scale is listed the product.)
As seen when looking into the instrument
EN
Step 3.
Look into the eyepiece and turn the Calibration Screw until the boundary
between the upper blue fi eld and lower white fi eld meet exactly on the zero
scale, such as shown in the image. That is the end of the calinbration process.
Make sure the ambient room temperature is correct for the solution you are
using(20°C/68°F). When working temperature of the room or environment
(not the sample) changes by more than 5°F we recommend recalibrating
to maintain accuracy. If the instrument is equipped with Automatic
Temperature Compensation system, the ambient working temperature of
the room must be 20°C68°F whenever the instrument is recalibrated. Once
calibrated, shifts in ambient temerature within the acceptable range
(10°C-30°C) should not eff ect accuracy.
Calibrate to “0”
Step 4.
Now place a few drops of the sample to be tested onto the main prism, close
the day light plate and check reading. Take the reading where the boundary
line of blue and white cross the graduated scale. The scale . The scale will
provide a dirdct reading of the concentration.
Reading of Sample
Warning-Maintenance
1. Accurate measurement depends on careful calibration. The prism and
sample must be at the same temperature for accurate results.
2. Do not expose the instrument to damp working conditions. And do
not immered the instrument in water. If the instrument becomes foggy,
water has entered the body. Call a qualifi ed service technician or contac
t your dealer.
3. Do not measure abrasive or corrosive chemicals with this instrument.
They can damage the prism s coating.
4. Clean the instrument between each measurement using a soft, damp
cloth. Failure to clean the prism on a regular basis will lead to inaccurate
results and damage to the prism s coating.
5. This is an optical instrument, It requires careful handling and storage.
Failure to do so can result in damage to the optical components and its
basic structure. With care, this instrument will provide years of reliable
service.
Summary of Contents for 11-270
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