3
Step3.
Look into the eyepiece and turn the calibration screw till the boundary between the upper blue field
and the lower white field meet exactly on the zero scale, such as
shown in the image. That is the end of the calibration process. Make
sure the ambient room temperature is correct for the solution you are
using (20
℃
/68
℉
). When working temperature of the room or
environment (not the sample) changes by more than 5
℉
, 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
℃
/68
℉
whenever the instrument is recalibrated. Once calibrated,
shifts in ambient temperature within the acceptable range (10
℃
-30
℃
)
should not affect accuracy
.
Calibrate to “0” scale
Step4.
Now place a few drops of the sample to be tested onto the main
prism, close the daylight plate and check reading. Take the reading
where the boundary line of blue and white separating the graduated
scale. The scale will provide a direct reading of the concentration.
Each model of scale different, but the operation method is
totally the same.
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. Don’t expose the instrument to damp working conditions, and don’t immerse the instrument in
water. If the instrument becomes foggy, water has entered the body. Call a qualified service
technician or contact your dealer.
3. Don’t measure abrasive or corrosive chemicals with these instruments. They can damage the
prism’s coating.
4. Clean the instrument after 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 needs careful handling and storage. Failure to do so can result in
damage to the optical components and its basis structure. With care, this instrument will last
years of reliable service.
