In the field of moisture detection, the contradiction between measurement accuracy and measurement speed has not been solved; for this situation, an instrument for rapidly measuring moisture with a drying structure is provided. The CSY-H1 corn water meter adopts the German HBM weighing system to ensure accurate weighing; the ring infrared heating source can quickly dry the sample; during the drying process, the CSY-H1 corn water meter continuously measures and instantly displays the moisture content lost by the sample. %, after the drying process is completed, the final measured moisture content value is displayed. Compared with the international oven heating method, infrared heating can dry the sample evenly and quickly at high temperature, and the surface of the sample is not easily damaged. The detection result is in good agreement with the national standard oven method, and it is replaceable, and the detection efficiency is far high. In the oven method. Intelligent operation, general sample measurement in just a few minutes, is a new type of rapid detection instrument.
CSY-H1 corn water meter product use:
CSY-H1 corn water meter can be widely used in all industries that need to quickly measure moisture, such as wheat, rice, corn, sunflower, sorghum, grain, grain, winemaking materials, seed cotton, coffee beans, broad beans, moisture content
1 Subject content and scope of application This standard specifies the instruments, operating procedures and results calculations used to determine the moisture content of crushed corn and whole corn. This standard applies to the determination of moisture content of crushed corn and whole corn.
2 Definition The quality of the crushed corn after drying at 130-133 ° C for 4 h and the whole corn drying for 38 h is the moisture of the corn.
3 Principle Under normal pressure, determine the quality of corn drying loss.
4 instruments
4.1 Balance: Sensitivity 0.01g and 0.001g;
4.2 Crusher: honey seal, easy to clean, no heat when crushing;
4.3 Metal dish or glass dish: without cover, can make 100g corn granules distributed at the bottom of the dish;
4.4 aluminum box or glass dish: with a sealed cover, diameter 5.5 ~ 6.0cm, height 3.5 ~ 4.0cm;
4.5 constant temperature oven: there is a blast device, the temperature is maintained at 60 ~ 80 ° C;
4.6 constant temperature oven: the temperature is maintained at 130 ~ 133 ° C;
4.7 Dryer: Contains an effective desiccant.
5 steps
5.1 Specimens that do not need to be pulverized 1.7mm> samples with particle size >1mm do not exceed 10%, and samples with particle size <0.5mm exceed 50%.
5.2 Samples to be crushed
5.2.1 Direct comminution of corn moisture content of 9% to 15% is directly pulverized. First, clean the pulverizer with a small amount of sample, discard the pulverized material, and then quickly pulverize about 30g of the sample, mix it evenly, and put it into a closed container for use. The following operation is performed by the second drying in the drying method twice.
5.2.2 Drying twice The moisture content of corn is greater than 15% or less than 9%. The first drying: Weigh about 100g of the sample with more than 15% water, and put it into a constant weight vessel to level it. The corn moisture was adjusted to 9% to 15% in an oven at 60-80 ° C. The adjusted sample was taken out of the oven and placed in the laboratory atmosphere for at least 2 h to reduce the sample to laboratory temperature. Weigh the adjusted sample, then quickly pulverize about 39g, mix well, and put it in a closed container for later use. If the moisture is below 9%, weigh about 100 g of the sample and place it in the laboratory atmosphere until 9% to 15% of moisture is obtained. The second drying: Weigh about 8g of the sample with an aluminum box baked to constant weight, and put it into the bottom of the box to flatten. The aluminum cover is placed on the bottom of the box, placed in the baking net around the thermometer in the oven, and baked at 130-133 ° C for 4 h, then the aluminum box is taken out, capped, and placed in a desiccator to cool to room temperature and weighed.
5.3 The whole sample is baked into a constant weight aluminum box, and 25~40g of the whole sample is quickly weighed from the 2kg original sample, immediately weighed, and then the aluminum box containing the sample is opened, and placed with the cover. In an oven of 130-133 ° C, after drying for 38±2 h, the aluminum box was taken out, placed in a desiccator, and cooled for 30 to 45 minutes.
6 Calculation of results
6.1 The direct pulverization sample and the water content of the whole granule sample are calculated according to formula (1):
M0-m1
Moisture (%) = ─────-×100 --------------- (1)
M0-m
Where: m -- aluminum box quality, g;
M0 -- mass of sample and aluminum box before baking, g;
M1 -- quality of sample and aluminum box after baking, g;
6.2 The water content of the two drying samples is calculated according to formula (2):
M1×m3
Moisture (%) = (1 - ─ ─ -) × 100 -------------- (2)
M0×m2
Where: m0 -- the mass of the sample before the second bake, g;
M1 -- the mass of the sample after the second baking, g;
M2 -- the mass of the sample before the first bake, g;
M3 -- the mass of the sample after the first bake, g.
6.3 Number of measurements and allowable difference The allowable difference between the two test results is not more than 0.15%, and the average is obtained. The measurement result takes the second place after the decimal point.
Appendix A Absolute Method (Reference)
A1 Scope of application This method is only used to check and improve the method of moisture determination in corn, and is not used for arbitration analysis.
A2 is defined in the same chapter.
The principle of A3 is the same as Chapter 3.
A4 instrument
A4.1 Balance: Sensitivity 0.01g and 0.001g;
A4.2 Vacuum pump: depressurize to 1.3 ~ 2.6kPa (equivalent to 1.3 ~ 2.6 mbar = 10 ~ 20mm Hg);
A4.3 Depressurization Dryer: The volume allows storage of vessels containing 100g of corn kernels;
A4.4 glass: for storing phosphorus pentoxide;
A4.5 Glass drying tube: divided into two parts, one part is placed on the sample tray, and the other part is placed in a cup containing phosphorus pentoxide to be connected with the vacuum pump;
A4.6 metal or glassware sample tray;
A4.7 constant temperature oven: with air blowing device, the temperature is maintained at 45 ~ 50 ° C, and the temperature is maintained at 130 ~ 133 ° C;
A4.8 Air Drying Curtain: A gas cylinder containing sulfuric acid (P20 ≥ 1.83 g/ml) is connected to a tube containing phosphorus pentoxide coated on glass fibers.
A5 Reagents The reagents used in this standard are of analytical grade. Dioxane (GB 2305-80). Sulfuric acid (GB 625-77).
A6 Operation steps A6.1 Specimens that do not need to be pulverized 1.7mm>The sample with particle size >1mm does not exceed 10%, and the sample with particle size <0.5mm exceeds 50%.
A6.2 Samples to be pulverized A6.2.1 Direct pulverization The moisture content of corn is directly crushed at 9% to 15%. First, the pulverizer is cleaned with a small amount of sample, the pulverized material is discarded, and then about 30 g of the sample is quickly pulverized, uniformly mixed, and placed in a closed container for use. The following step is performed by the second drying operation in the twice drying method.
A6.2.2 Drying twice The moisture content of corn is greater than 15% or less than 9%. The first drying: weigh about 100g of the sample with more than 15% water, put it into the constant weight of the vessel and flatten it, then put the vessel into the dryer, put a few 1cm thick in the dryer. When the cup of phosphorus pentoxide is depressurized to 1.3 to 2.6 kPa (corresponding to 10 to 20 mmHg) by a vacuum pump, the vacuum pump is turned off, the vacuum is maintained, and the sample is stored in a desiccator for about 2 to 4 days to adjust the moisture to 9%. ～15%, the air slowly enters the dryer through the drying curtain to restore atmospheric pressure, the sample is kept in the laboratory atmosphere for at least 24h, the temperature is reduced to the laboratory temperature, and then weighed, then quickly pulverized by about 30g, and evenly mixed. Put it in a closed container for use. If the moisture is below 9%, weigh about 100 g of the sample and place it in the laboratory atmosphere until 9% to 15% of moisture is obtained. The second drying: Weigh about 3g of the sample with a vessel that is baked to constant weight, and spread it to the bottom of the dish. Open the vessel containing the sample (the lid is left in the dryer) and place it on the closed end of the drying tube. Place the cup containing about 1 cm thick of phosphorus pentoxide near the sample vessel, fix the two parts of the drying tube, and open the vacuum pump. When pressing to 1.3~2.6kPa, close the vacuum pump, put the matching drying tube with sample into the oven with temperature control at 45~50°C, take out the tube from the oven after about 10h, cool to room temperature, connect the tube In the vacuum pump, the air is passed through the drying curtain into the drying tube, allowing it to return to atmospheric pressure, and the sample vessel is quickly taken out and covered with a weighing. The above operation is repeated until the sample mass is constant (for example, until the interval of 24 h, the difference between two consecutive weighings is less than 0.0006 g).
A7 Calculation of results A7.1 The direct pulverization sample and the water content of the whole granules are calculated according to formula (A1):
M0-m1
Moisture (%) = ─────-×100 --------------- (A1)
M0-m
Where: m -- aluminum box quality, g;
M0 -- mass of sample and aluminum box before baking, g;
M1 -- quality of sample and aluminum box after baking, g;
A7.2 The moisture content of the two drying samples is calculated according to formula (A2):
M1×m3
Moisture (%) = (1 - ─ ─ -) × 100 -------------- (A2)
M0×m2
Where: m0--the mass of the sample before the second bake, g;
M1--the mass of the sample after the second baking, g;
M2--the mass of the sample before the first bake, g;
M3--the mass of the sample after the first bake, g.
A7.3 Number of measurements and allowable difference
The difference between the two test results is not more than 0.1%, and the average is the measurement result, and the measurement result is the second place after the decimal point.
Note: 1 The results measured by direct pulverization method and twice drying method should not exceed 0.15% compared with the results obtained by the absolute method of Appendix A. 2 The results measured by the whole particle method should not exceed 0.5% compared with the results obtained by the absolute method of Appendix A.
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