Principle: When light enters another transparent medium from a transparent medium, it produces a refraction phenomenon caused by the different speeds of light in various media. Refractive index is the ratio of the speed at which light travels through air to the speed at which it travels in other materials. Refractive index The ratio of the speed of light in air to the speed of light in the object or the sine of the angle of incidence of the angle of incidence of light from the air passing through the object under the conditions of the sodium line D and 20 °C. .
Regarding the function, a color liquid crystal display and a touch panel are used, and USB and LAN are standard interfaces to cope with various expansion devices. Kyoto Electron Industry Co., Ltd. (KEM) is the only manufacturer of refractive index standard liquids approved by Japan. The digital refractometer can be inspected using a refractive index standard to provide users with high-accuracy, high-confidence analysis results.
component
1, the light board
2, refractive prism
3, zero correction screw
4, eyepiece
5, rubber sleeve two, how to use
l When using the hand-held refractometer, hold the rubber sleeve with the four fingers of the left hand and adjust the eyepiece with the right hand to prevent the body temperature from being transmitted to the instrument, which will affect the measurement accuracy.
2. Open the light plate and wipe the refractive prism with a soft flannel.
3. Drip a few drops of distilled water onto the refractive prism, gently close the light plate, distribute the solution evenly on the surface of the prism, and align the instrument into the light source or bright place. The eye observes the field of view through the eyepiece. If the field boundary is unclear, rotate the eyepiece to make the field of view clear, and then rotate the zero-fixing screw to make the light-dark boundary line at zero. Then wipe the distilled water and replace it with the test solution. At this time, depending on the boundary line, the corresponding division scale value is the concentration value and density value of the tested solution. 4. Precautions This instrument is a precision optical instrument. In the use and maintenance, the following matters should be noted: 1. In use, it must be carefully and carefully used strictly according to the instructions. Do not loosen the connection parts of the instrument at all, and must not fall or collide. Severe vibrations are strictly forbidden. 2. After use, it is strictly forbidden to put it into the water for cleaning. Apply clean and soft flannel to wipe it clean. For the surface of optical parts, it should not be scratched or scratched. 3. The instrument should be stored in a place that is dry, dust-free, oil-free and free of acid and other corrosive gases, so as to avoid corrosion or mildew of optical parts. 4. The warranty period of the instrument is one year from the date of sale. If the fault occurs during normal use, the user has not repaired it by himself. Our factory is responsible for free maintenance. If the warranty period is exceeded or the malfunction is caused by improper use, the factory is responsible for maintenance. , properly charge the repair fee.
Test component
Salinometer - Refractometer is designed according to the principle that different concentrations of liquid have different refractive index. It is an instrument that uses light test liquid. Salinometer is used to quickly determine the weight of salt (sodium chloride) solution. Percent concentration or refractive index. Widely used in salt, food, beverage and other industrial sectors as well as agricultural production and scientific research. The seawater salinity meter is measured in units of one thousandth. With a simple operation, the user can quickly read the salt concentration or the specific gravity of the seawater. It can be applied to seawater, fishery, seawater used by farms, seawater or artificial seawater used in aquarium, concentration management sugar meter for salt water used for storing fish. This instrument is used to quickly measure the concentration of sugar-containing solution and other non-sugar solutions. Or refractive index. Widely used in sugar, food, beverage and other industrial sectors as well as agricultural production and scientific research. It is suitable for the measurement of the concentration of various sauces (flavorings) such as soy sauce and ketchup. It is suitable for measuring the sugar content of sugar-containing products such as jam, syrup, liquid sugar, etc., and is suitable for the production line of juice, refreshing beverage and carbonated beverage. , quality management, pre-shipment inspection, etc., suitable for the process of fruit from planting to sale, it can be applied to determine the accurate harvesting period, to classify the sweetness classification... In addition, the concentration of the pulp in the textile industry is determined. It is also widely used to measure the concentration of human and animal physiological fluids accurately and quickly. The three sets of scales measure urine specific gravity, serum protein and refractive index. The product has simple structure, convenient operation and clear vision, and is an indispensable testing equipment for hospitals, scientific research institutions and the veterinary industry. . .
Abbe refractometer usage
NAR-3T high precision Abbe refractometer
NAR-3T high precision Abbe refractometer
I. Installation of the instrument. Place the refractometer in front of the window or incandescent lamp. However, do not place the instrument in direct sunlight to avoid rapid evaporation of the liquid sample. Use a rubber hose to connect the water inlet of the measuring prism and the auxiliary prism on the auxiliary prism in series with the super constant temperature bath. The constant temperature is based on the thermometer reading on the refractometer.
2. Add the sample release button, open the auxiliary prism, so that the matte slope is in the horizontal position, use a burette to add a small amount of acetone to clean the mirror surface, and promote the non-volatile pollutants to escape. When using the burette, be careful not to make the tube tip hit the mirror surface. If necessary, use a lens tissue to gently dry the mirror, but do not use filter paper. After the mirror surface is dried, a few drops of the sample are dropped on the mirror surface of the auxiliary prism, the auxiliary prism is closed, and the lock button is tightened. If the sample is volatile, it can be added from the dosing slot when the two prisms are close to close, then close the two prisms and lock the lock button.
3. Rotate the handle to the light so that the indication on the scale of the dial is minimized, so adjust the mirror so that the incident light enters the prism group and observes from the measuring telescope to make the field of view brightest. Adjust the eyepiece to make the field of view the clearest.
4. Rotate the handle coarsely so that the indication on the scale of the dial gradually increases until a colored band or black and white critical line appears in the field of view.
5. Achromatic dispersion rotating achromatic handle, so that a clear light and dark critical line appears in the field of view.
6. Finely adjust the rotating handle so that the critical line is positively at the intersection of the X-shaped guide wires. If it is slightly dispersive at this time, the achromatic dispersive handle must be re-adjusted to make the critical line clear and clear. (The color change of the image seen by the eyepiece on the right side of the adjustment process is shown below)
7. The reading is to clean the protection dial. The refractometer generally installs the dial in the cover. When reading, first open the small window above the cover to make the light enter, and then read the corresponding indication on the scale from the reading telescope. value. Since the eye is easy to fatigue when judging whether the critical line is at the intersection of the quasi-filament points, in order to reduce the accidental error, the handle should be rotated and the measurement is repeated three times. The difference between the three readings cannot be greater than 0.0002, and then the average value is taken. The influence of the composition of the sample on the refractive index is extremely sensitive. Due to contamination or evaporation of volatile components in the sample, slight changes in the composition of the sample may result in inaccurate readings. Three samples were taken repeatedly, and the data of the three samples were measured, and the average value was taken.
Refraction theory
If you put a pencil in a glass of water, the top will appear curved. Then if you put syrup in a cup and try the same experiment, the top of the pencil should look even more curved. An example of this refractive index phenomenon.
The refractometer is put into practical use due to the use of a new optical system. The solubility of the test solution was measured by conversion of the correspondence between the refractive index of the solution and its solubility. As the density of a substance increases, its refractive index rises commensurately.
1. A refractometer uses a prism to hold a refractive index theory that is higher than a refractive index of a test solution; the solubility or refractive index of the test solution is measured by conversion.
2. In the case where the test solution is relatively thin, the refractive index of the test solution is higher than that of the prism, so the angle of refraction is relatively large.
3. In the case where the test solution is relatively thick, the refractive index of the test solution is lower than that of the prism, so the angle of refraction is relatively small.
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