The principle and operation steps of the crude fiber analyzer The measurement of the crude fiber content is used in any field. In the animal husbandry, the reasonable fiber content of the feed is measured by the measurement of the crude fiber content of the feed, which not only improves the quality of the meat but also the maternal animal. The next generation of breastfeeding has a great relationship, and relative to humans, there are certain requirements for the intake of fiber content every day. When it exceeds a certain range, not only does it have no benefit, but it will affect our health. The crude fiber content can be determined by a simple analytical method in a general laboratory, but the most reasonable and rapid method is to use a crude fiber analyzer for measurement and operation. By using a coarse fiber analyzer, it is possible to reduce a lot of trouble and save. Measurement time, small error in measurement results, etc. The Qiao Yue crude fiber analyzer is an instrument for digesting samples according to the commonly used acid-base digestion method and performing weight measurement to obtain the crude fiber content of the sample. The crude fiber analyzer uses acid and alkali with accurate concentration, digests the sample under certain conditions, and then removes the soluble matter with ethanol. After burning at a high temperature, the amount of the mineral is deducted, and the content is called crude fiber. The crude fiber tester is not an exact chemical entity, but is a rough component measured under recognized mandatory conditions, with cellulose being predominantly present with a small amount of hemicellulose and lignin. When using a fiber analyzer to measure the fiber content in feeds and other articles, pay attention to the fiber content in the articles to be tested. If the fiber content is too high, it will directly affect the measurement error, and the crude fiber content in the contemporary test sample. Below 10%, the absolute value error is ≤ 0.4, which is suitable for measurement using a coarse fiber analyzer; however, if the crude fiber content is above 10% and the relative error is ≤ 4%, pay attention to the fiber in the sample when measuring the fiber content. The level of content. The steps of the Qiaoyue brand crude fiber analyzer The Qiao Yuewei tester adopts the principle of acid-base digestion method (digesting the sample under certain conditions, then removing the soluble matter with ethanol, and deducting the mineral after burning at a high temperature). The operation steps (operation must be carried with thick rubber gloves) are as follows: 1. First take down the three flasks at the top of the instrument, then close the three valves connected to the rubber tube (the switch and the valve are kept in a vertical state), then add the prepared acid, alkali and distilled water respectively (should be no less than 2000ml). ), cover the cap and place it on the heating plate at the top of the instrument. 2. Put the crucible on the sealing ring first, then put 1-2g (accurate to 0.0002g) sample in the crucible. Pull up the lifting handle again, at this time, the instrument will automatically drop the suction cup holder, and then put the sputum into the 6 suction filter holders. Press the lifting handle again, then the suction cup, the crucible and the cooking tube will be clamped to each other (note that when the lifting handle is pressed, make sure that the bottom cup is sucked, the crucible and the digesting tube are aligned with each other to avoid smashing the glass). Then, the three pieces of glass are screwed to each other by hand to ensure that the liquid does not seep out during operation. 3. Connect the tap water to the water inlet on the left side of the instrument, then turn on the tap water switch, paying attention to the moderate amount of water. Turn on the power switch first, then turn on the acid, alkali, and distilled water preheat switch, adjust the preheating voltage knob, and adjust it to clockwise maximum. At this time, the voltmeter shows that the voltage is about 220V. 4. When the acid, alkali and distilled water boil, the preheating voltage is adjusted to be slightly boiling to the acid, alkali and distilled water. 5. After the above liquid is slightly boiled, adjust all the 8 red ball switches below to the horizontal closed state, then insert the valve outlet on the acid bottle rubber tube into the cooking tube, slowly open the valve, and add the acid separately. In the digestion tube (from left to right, the number of cooking tubes 1, 2, 3, 4, 5, 6) is 200ml (about the horizontal position under the middle partition of the cooking tube), close the valve, and then in each Add 2 drops of lucky yeast to each tube. Turn off the acid preheat switch. Close the heat shield to the front of the heating box, and adjust the digestion tube pressure knob to the maximum. At this time, the corresponding voltmeter shows about 220V. After the acid in the tube is slightly boiled, adjust the voltage to 150-170V. Left and right, keep the acid boiling slightly, open the timer switch up, the setting time is 30 minutes (usually adjusted at the factory). When the 30-minute digestion time is up, the buzzer will sound. 6. Turn off the heating switch, remove the heat shield, turn the cooking pressure selector knob counterclockwise, first open the corresponding valve of 1-6 glass tube (one individually open suction filter), then open the suction filter valve. Finally, open the suction pump control switch to pump off the acid. After pumping, close the suction pump control switch, then close the corresponding valve of the glass tube, and finally close the suction filter valve. (If you find that the cockroach is clogged during the suction filtration process, you can turn off the suction pump switch, then open the recoil valve switch first, then open the recoil pump switch with the airflow backflush, until the bubble appears, close the recoil pump switch, close the reverse Punch the valve switch, then open the suction pump switch to continue pumping. Close all valve switches and pump switches after washing. 7. After all the acid in the digestion tube is filtered, insert the valve outlet on the rubber tube of the distilled water bottle into the corresponding digestion tube, open the valve on the rubber tube, add 200ml of distilled water to the digestion tube, and then drain. 2-3 times in a row, until the liquid filtered out by the test paper is neutral, and then the distilled water switch is turned off. The six cooking tubes are separately filtered with distilled water and tested with a test paper. 8. Then insert the valve outlet on the rubber tube of the alkali bottle into the corresponding digestion tube, open the valve on the rubber tube, add 200ml of the slightly boiling alkali solution to the digestion tube, close the valve, and add in each cooking tube. After 2 drops of the lyophilized solution, the alkali digestion, suction filtration and distilled water washing are carried out in accordance with the operation of the second half of the fifth and the sixth and seventh steps. 9. After the above work is completed, add about 25 ml of 95% ethyl yeast to the top of the digestion tube with a straw, and soak for ten minutes and then drain. 10. Carefully pull up the lifting handle. At this time, the suction cup and the sputum will fall together (sometimes the cooking tube and the sputum will be sucked), then the hand presses the suction filter base to make the sputum and the suction filter base loosely rise and make å©åŸštake out. (When the cooking tube and the sucking tube are sucked, turn the cooking tube in the opposite direction to the crucible so that the crucible is taken down and taken out). < 11. Finally, remove the sealing ring on the crucible (see the structure drawing), move the crucible into the incubator, dry it at 130 °C ± 2 °C for 2 hours, remove it and then cool it to room temperature in a desiccator. M1. The weighed crucible is placed in a high temperature furnace at 500±25° C. for 1 hour, taken out, placed in a desiccator and cooled to room temperature to obtain m2, and the measurement result is calculated by the following formula: M1— m2 Crude fiber%=————————————% m Where: m1 -----130 °C after drying and sample residue weight; M2-----500 °C after burning and the residue of the sample; m------Sample (not degreased) mass. 12, after removing the å©åŸš, turn off the power
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