The maintenance and maintenance of the instrument can be described as a very important part of the experiment and the use of the instrument in the production. Once the instrument absorbs dust and dirt, it not only affects the performance of the instrument, shortens the service life, directly affects the experimental effect, but also affects the aesthetics and the physical and mental health of the experimenter. Therefore, dust removal and cleaning are the highlights of instrument maintenance. Zhang Gonglai, an engineer at Nanning Aidop Instrument Equipment Maintenance Co., Ltd., summarized the following methods for maintaining and cleaning the common instruments in the laboratory.
First, the electronic balance

The details of the experiment and the cleaning and maintenance were not in place. After the experiment, some substances remained on the weighing pan, and stains were left on the weighing pan. The sensitivity and accuracy of the balance are reduced and the service life is also shortened. The electronic balance must be preheated for 10 minutes before use , but some students weigh directly after starting up.
The temperature of the weighing object must be the same as the temperature of the balance. Do not place objects that are too hot or too cold on the balance pan. Some volatile corrosive reagents should be weighed in a closed container. When weighing the object, remember to close the side door of the balance. After weighing, clean the weighing plate up and down and all corners. When the air is wet and the material has formed into a scale, mechanical rust removal method should be adopted, that is, the rust layer on the parts should be removed by shovel, picking, scraping, etc., then sanded, polished, and finally coated with sandpaper. Upper protective layer. After the experiment is completed, close the side door, cover the balance cloth, and store it in a dry place away from light.

Second, electric constant temperature drying oven

The working temperature of the drying oven is 220V , and the temperature is 100 to 110 degrees. It should not be too high. The flammable and volatile chemicals should not be placed in the box. The contents of the box should be placed at the center of the partition, and the air circulation should not be affected to ensure uniform temperature inside the box.
During the use of the drying oven, students cannot touch the cabinet and switch with wet hands. If the oven is in normal operation, such as abnormality, odor, smoke, etc. during the use, please turn off the power immediately, and ask the professional to check the repair. The wall of the tank wall and the surface of the equipment should be wiped frequently to keep it clean and increase the transparency of the glass. If the long-term need drybox, should unplug the device to prevent damage to people, and by the conditions of use should be regularly run 2 to 3 days to drive off the moisture collector section, to avoid damage on the device.

Third, constant temperature water bath

In use, students should be aware of its use and precautions so that the experiment can proceed smoothly. Do not connect the power before adding water. It is best to add distilled water to avoid scale formation. Do not add too much water to avoid overflowing the pot when boiling. The water in the pot should not be lower than one-half, and the heating tube should not be exposed to the water surface; Do not water or the water level is lower than the partition heating, otherwise the heating tube will be damaged. Do not allow water to flow into the control box during water injection to prevent electric shock. If the constant temperature control fails, the silver joint on the controller can be polished with a fine abrasive cloth. After use, remove the thermostat, turn off the power, remove the water from the cabinet, and record the instrument usage.

Fourth, the maintenance and cleaning of common optical instruments

Optical instruments commonly used in laboratories such as spectrophotometers, prisms for refractometers, slides, etc. are some of the precision optical instruments. In use and maintenance, care must be taken carefully and strictly in accordance with the instructions. Do not loosen the connection parts of the instrument. Do not drop or collide with the instrument to prevent damage to the optical components and affect accuracy.
There should be no hard impurities in the test sample. When testing the solid sample, the surface of the refractive prism should be prevented from being pulled or indented. After use, it is strictly forbidden to wash directly into the water to avoid water in the optical system. Open the prism and wipe it dry with the lens paper. Under no circumstances should anything other than the lens paper be touched to the prism to avoid damaging its optical plane. The instrument should be stored in a place that is dry, dust-free, oil-free, and free of harmful, flammable, explosive, etc., to avoid corrosion or mildew of optical parts. Optical instruments are prone to oil stains, water-wet dirt, fingerprints, etc. during use, affecting imaging and light transmittance. Clean the prism of the refractometer, the mirror of the plane, and the lens of the microscope, first wash it with distilled water. If the mirror surface is stained, it can be washed with a mixture of ethanol and ether. When cleaning, use a special lens paper or cotton ball with a small amount of cleaning agent, wipe it in one direction, and make a circular motion from the center of the lens. Do not soak the lens in the cleaning agent. Do not wipe the lens cleanly, otherwise it will scratch the AR coating and damage the lens. After cleaning, wipe it with lens paper and keep it away from light.
The above is a simple summary of the laboratory common instrument maintenance methods, if you need to know more friends, please call Zhang Gong, 13367714913