Operation procedure of main inspection instruments in feed laboratory

722 rules for operation and use of visible spectrophotometer 1. Turn on the power and preheat for 20 minutes. two。 Set it to the desired wavelength. (adjust wavelength knob) 3. Zero (0% T) place the shader into the sample holder and pull the sample holder lever to enter the optical path. Then press the "0% T" button of the instrument to complete the zero adjustment. 4. Put the blank sample into the sample rack (the first hole of the colorimetric frame is put into the background, and the sample cover must be covered), and pull the sample holder lever to enter the optical path. Then press 100% T on the instrument and the screen displays "BL" to complete the hundred. (0.000 in absorbance mode and 100.0 in transmittance mode) 5. The measurement press the "function" key, switch to the measurement mode, and the sample room cover, the instrument display 0.000, you can pull the sample rack to make the test sample into the test road position, the current display data is the value of the sample being tested. Developer: rules for the operation of TG328A optical analytical balance on December 30, 2008. Calibrate the horizontal position of the balance and return all the mechanical codes to zero. two。 Turn on the power and preheat for 30 minutes. 3. Gently open the side door, weigh the sample, the sample can not be placed directly on the balance plate, accurate to 1/10000 grams, weighing range 0mm 199.990g. 4. When measuring an object, the weight must be selected in the order of "from big to small", that is, starting from the weight about equal to the mass of the object to be measured, gradually increasing the weight from large to small, and increasing or decreasing the weight in the direction of pointer offset, until the alignment appears in the projection screen and stops reading within 10 milligrams. 5. After weighing, take out the tested object, and the mechanical index plate should all be returned to zero. Close the balance door, cut off the power, and install the dust shield. Developer: rules for the operation and use of SK-95-10 box resistance furnace 1. Connect the resistance furnace and the controller and connect the power supply. two。 The new resistance furnace is preheated for about 20 hours as required. 3. When in use, adjust the temperature of the controller according to the style requirements. 4. Put the pattern in the furnace, tube the furnace door, and begin to heat up. 5. The timing starts when the specified temperature arrives, and the power supply is turned off when it takes time. 6. Open a crack in the furnace door and wait 30 minutes before opening the door to take samples. Developer: rules for the operation and use of 101-0 electric constant temperature drying oven 1. The blast switch is set to the off state, the temperature is set to the low temperature state, and the power supply is connected. two。 Press the setting button, set the desired temperature, and then press the setting button to be in the measuring state. 3. Insert a thermometer above the vent and take the temperature here as the actual temperature. 4. Put in the style for drying, adjust according to the required time, do not open the door in the middle. 5. After drying, take out the sample and turn off the power supply. Developer: year, month and day-the language is concise, thank you for your guidance! The optical analysis balance is too troublesome to use.-- operating rules for the sample grinder (1) the crusher is placed on a flat table. (2) check whether the power supply and the crusher are normal before use, and whether there is a residual sample in the grinder. (3) check whether the sieve of the crusher is the required specification. (4) the samples in the hopper shall be put into the grinder after the crusher is started. (5) after the sample is crushed, the sample shall be cleaned up after the grinder stops. (6) it is strictly forbidden to open the crusher without closing the grinder door. Electronic analysis balance operation rules (1) check before use: 1, check whether the balance is horizontal, whether the balance plate is clean, if there is dust, apply soft hair brush clean. 2. Check whether the silica gel desiccant in the balance room changes color. If the desiccant changes color, the desiccant should be replaced. (2) Calibration of the balance: the balance must be energized for 60 minutes to obtain a stable working temperature. After stabilization, press the "T" key to display "0.0000g", press and hold the "C" key to display "CAL" and put the calibration weight in the center of the scale. At the same time, close the glass door of the windshield and wait for the internal automatic calibration of the balance. When the display shows the nominal value of the calibration weight and the buzzer rings, the balance calibration ends. (3) Operation step 1, boot: leave the balance empty and click the "on" key, the balance shows self-test (all fields flash, etc.). After the balance is stable and corrected, it can be weighed. 2. Shutdown: hold down the "off" key until the word "OFF" appears. Release the key. 3. Simple weighing: when the balance shows "0.0000", put the sample on the weighing plate and close the glass door of the balance windshield. Wait for the balance to stabilize and display the unit "g" and read the weighing result. (4) precautions: 1. The analytical balance should be placed on a uniform and firm table at room temperature to avoid vibration, moisture, direct sunlight and the attack of corrosive gases. 2. Check whether the balance is intact before and after weighing and keep the balance clean. When weighing, you should pay attention to closing the balance door. 3. The load of the balance should not exceed the maximum load, and the items should be placed in the center of the plate. 4. The weighing of chemical reagents and samples must be placed in appropriate containers, such as weighing bottles, surface dishes or cellophane, and shall not be weighed directly on the balance plate. 5. The balance should be calibrated before first use, regular weighing service and changing position. The calibration weight should be preserved. Operation rules of spectrophotometer (1) installation and debugging of instrument 1. Spectrophotometer is a precision instrument made by photoelectric principle and used to measure the optical density or absorbance of solution for qualitative or quantitative analysis. The prescribed principles must be observed when in use. 2. The instrument must be installed in a clean and dry room at a temperature of 5-35 ℃. 3. Avoid vibration and put it on a stable worktable when in use. 4. Avoid direct sunlight. 5. Stay away from high-intensity magnetic field, electric field and electrical equipment that produce high-frequency waves, and away from places with corrosive gases such as hydrogen sulfide, sulfite, fluorine and so on. 6. The power supply is (220 ±22) V, (50 ±1) Hz, and must be equipped with grounding wire. (2) the use and maintenance of the instrument. 1. Turn on the power and preheat for 30 minutes. 2. Put the blank into the first slot for reference, and the other as the sample slot. 3. Adjust the'0' and full deviation, pull the sample slot pull rod in turn, and read out the absorbance A value directly after the pointer is stable. Every time you read a'A 'value, you should adjust' 0' and full deviation once, and the reading should be quick, in case the reading time is too long, resulting in inaccurate reading. 4. the transparent side of the colorimetric dish should not be touched by hands. It should be kept clean and bright, free of dirt and water droplets. 5. The liquid in the colorimetric dish should have no bubbles and should not be splashed into the dark chamber of the photometer to prevent corrosion damage and the solution will fill the light path of the gas sample chamber after evaporation and gasification, resulting in measurement errors. 6. after the measurement, the colorimetric dish should be fully cleaned and dried, and the silica gel desiccant should be put into the dark room of the photometer to prevent the lamp room from getting damp and the mirror from getting moldy or stained. 7. The moistureproof silica gel in the drying tube should be kept blue. If it turns red, it should be removed and replaced to prevent the instrument from getting damp. 8. After each use, cover the instrument in time and put several bags of silica gel desiccant. 9. The perimeter of the instrument should be kept clean and tidy, free of sundries. Fat extraction device (1) the Soxhlet extractor is connected by an extraction tube, an extraction bottle and a condensation tube, and there are siphons and vent pipes on both sides of the extraction tube. The filter paper package containing the sample is placed in the extraction tube, and the solvent is added to the extraction bottle. When heated, the solvent vapor passes through the vent pipe to the condensation tube, and the condensed solvent is dropped into the extraction tube to extract the sample. (2) when the height of the solvent in the extraction tube exceeds the height of the siphon, the solvent dissolved in fat in the extraction tube flows into the extraction bottle from the siphon. After repeated extraction, all the fat in the sample was gradually concentrated in the extraction bottle. After extraction, the fat content of the sample was calculated by using the weight of the sample filter paper before and after degreasing. Because the organic solvent extracted from the sample is not only fat, but also contains other fat-soluble components, so the result of this experiment should be the content of crude fat. (3) precautions when the filter paper package is placed in the oven drying solvent, in order to prevent the ether gas from burning and catching fire, the oven should first use the operating rules of the semi-open vacuum pump and matters needing attention 1. Unscrew the refueling plug first, refuel from the refueling hole to the oil standard 2par 3, and then add a little pump oil from the intake pipe hole to lubricate the pump cavity to avoid biting and heating after starting. The No. 1 vacuum pump oil is selected for the pump oil, or the light high-grade engine oil imported from the car can be used instead. 2. Connect the power cord according to the regulations (three-phase motor should pay attention to the direction of rotation of the motor should be consistent with the direction of the arrow on the pump bracket), remove the rubber plug cap from the exhaust pipe, turn by air, and then start working normally. 3. The connecting pipe with the intake pipe of the pump should not be too long. Please pay attention to check the connecting pipe outside the vacuum pump. The joint and container must not leak air and should be sealed. Otherwise, it will affect the limit vacuum and vacuum pump life. 4. The working environment of the pump: the temperature is in the range of 5 ℃-40 ℃, the relative humidity is not more than 85%, and the air inlet pressure is less than 1.3 to 1000. For vacuum pumps with pumping speed above 0.5 liter / s, all are equipped with ballast valves. If the relative humidity is high, the ballast valves can be opened to purify the pump oil and prolong the service time of the pump oil, and close in time after purification. 5. The suction port of this pump shall be continuously open to the atmosphere for no more than 3 minutes. 6. This pump is a high-precision product, and it is not a corrosion-resistant vacuum pump. It is recommended to use a filter. One of the following situations does not work: (1) do not pump gas or colloidal, aqueous, liquid and corrosive substances containing particles and dust. (2) gases containing explosive or excessive oxygen cannot be sucked. (3) the system cannot leak and the container matched with the vacuum pump is too large to work under long-term pumping. (4) it can not be used as gas pump, compression pump and so on. Operating rules of constant temperature water bath pot (1) instructions for use (1) before electrification, first add an appropriate amount of water to the water tank, it is best to choose distilled water, do not have no water or the water level is lower than the electric heating pipe, in order to prevent the explosion of the electric heating pipe. 2. The temperature control system of the instrument adopts TDA- 8002 pointer temperature control instrument. When in use, the power is turned on, the green light is on, the instrument starts to work, and the heater begins to heat. Then according to your desired temperature, the switch temperature setting knob, when the green light is on, it means heating up; when the red light is on, stop heating up, and the heater stops heating. When the traffic light jumps alternately, it indicates that it has entered a constant temperature. If you want to change the temperature, turn the temperature setting knob at any time, and the temperature indication displayed by the temperature control instrument is the actual required temperature. (2) Note 1. When the water bath pot is in use, it must be reliably grounded, and the water must not overflow into the control box to avoid danger. 2. The power supply-220V must be used in accordance with the regulations, and must not be connected to the 380V power supply, otherwise the equipment will be damaged. Operation rules of constant temperature drying oven (1) Operation method 1. Turn on the power supply. 2. Adjust the temperature controller to the desired temperature. 3. Place the object to be tested when the temperature indication arrives. 4. Avoid opening the oven door when starting the determination. (2) Correction method 1. Compare the 150℃ thermometer with the temperature controller for correction. 2. When the temperature of the oven reaches the set temperature, put the 150℃ thermometer into it. 3. Time 60 minutes to read the temperature value when the temperature reaches a stable state. 4. Repeat steps 2 and 3 at least three times. (3) maintenance. 1. Keep the oven clean at all times. 2. Regular ventilation and dehumidification. (4) precautions 1. Avoid putting strong acids, alkalis or erosive substances. 2. If the liquefied grease should be packed on a plate, the oil attached to the bottle will not drip into the box. Operation rules of high-temperature furnace (1) instructions for use 1. High-temperature electric furnace is a kind of high-temperature heating equipment with temperature controller, which is lined with refractories inside and outside, and silicon-carbon rods or Ni-Cr resistance wires as heat sources in the middle. In the high temperature room, there is a thermocouple connected with the temperature controller to control the temperature in the furnace. 2. The high-temperature furnace should be placed on a solid and stable countertop, flammable and explosive materials should not be placed around the furnace, and clean refractory bricks should be lined in the furnace when in use, so as to prevent the heated object from adhering to the furnace. 3. When the electric stove is used for the first time or shut down for a long time, it must be baked again. The baking time is 20 ℃ 4 hours at room temperature and 200-600 ℃ 4 hours. When in use, the furnace temperature should not exceed the maximum temperature, so as not to burn out the electric heating elements. It is also forbidden to pour all kinds of liquids and molten metals into the furnace. 4. After burning, first cut off the power supply, then half open the furnace door, let it be slightly cold, and then fully open the furnace door, which can prevent the furnace from being suddenly cold and broken. If the stove is not in use, the furnace door should be closed to prevent moisture from eroding the furnace. (2) Note 1. Electric furnaces and controllers must work in places where the relative humidity does not exceed 85% and there are no conductive dust explosive gases and corrosive gases that can damage metal insulation and electronic components. 2. Regularly check whether the connecting parts of the electric furnace and the conductive system of the controller are in good condition. 3. The furnace temperature shall not exceed the maximum temperature. Operation rules of nitrogen determination instrument (1) the whole set of equipment is composed of electric heating digester and still. in order to improve the detection speed of protein content determination, the key is to accelerate the time of sample digestion and digestion. (2) if the gas overflows during digestion, increase the flow rate of suction pump water. (3) NaOH solution is not used for a long time, the tube is easy to produce adhesion phenomenon, every day after the work of the NaOH external skin tube, moved into the distilled water bottle, wash several times, to be used next time, in the distillation to discharge 100mlNaOH, in order to prevent dilution of NaOH. (4) at the end of each sample distillation, the digestive tube must be removed quickly to prevent the inverted suction of the digestive tube liquid from corroding the electrode plate in the evaporation furnace. -- how patient! Thank you for your hard work!-not bad, collect it! Thank you!-this is a better way. Everyone can post their own good things and enrich the professional knowledge of the forum, which will be convenient for those in need. Support! -do you have a laboratory centrifuge? How many revolutions do you usually use? What is the specification of the centrifuge used for rapid detection of melamine? Thank you for hugging and sharing! Thank you! 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