In order to protect the cleanliness of the dial, the refractometer generally installs the dial in the cover. When reading, first open the small window above the cover to allow light to enter, and then read the corresponding indication on the scale from the reading telescope.
Since the eyes are easily fatigued when judging whether the critical line is at the intersection of the quasi-wire points, in order to reduce accidental errors, the handle should be rotated and the measurement should be repeated three times.
The influence of the composition of the sample on the refractive index is extremely sensitive. Due to contamination or the evaporation of volatile components in the sample, slight changes in the composition of the sample will lead to inaccurate readings. Therefore, a sample must be measured. Repeat the sampling three times, measure the data of these three samples, and take the average value.
This instrument is a precision optical instrument. During the use and maintenance, the following matters should be paid attention to:
1. In use, you must be careful and use it in strict accordance with the instructions. Do not loosen the connecting parts of the instrument arbitrarily, and do not drop, collide, or violently vibrate.
2. After use, it is strictly forbidden to directly put it into water for cleaning. It should be wiped clean with a clean soft flannel cloth dipped in water. The surface of the optical parts should not be bumped or scratched.
3. The instrument should be stored in a dry, dust-free, oil-free and acid-free place to avoid corrosion or mildew on optical parts.
4. The warranty period of this instrument is one year from the date of sale. If there is a failure during normal use and the user does not repair it by himself, our factory is responsible for free repairs. If the warranty period exceeds the warranty period or the failure is caused by improper use, our factory is responsible for repairs. , and charge the repair fee appropriately.