AACC-64-70A.pdf
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1、Sampling AACC Method 64-70A Page 1 of 6 Manual Sampling of Wheat and Other Whole Grains Final approval April 13, 1961; Reapproval November 3, 1999 Objective A representative sample is essential for sound inspection and quality analysis This method provides the manual (nonmechanical) means of obtaini
2、ng a repre- sentative sample from a large mass of grain and similar material. The method is applicable to small grains, corn, and pulses. Apparatus 1. Double-tube compartment probe, constructed of brass or aluminum and consisting of two tubes, one inside the other. Inner tube is divided into compart
3、- ments. Outer tube has slots that match compartment openings of inner tube. When tubes are aligned, bulk grain may enter or be extracted from compart- ments. Designed to draw samples of bulk grain from stationary containers. See Fig. 1. 2. Pelican. Leather pouch, approximately 18 cm deep and 46 cm
4、long, with band of iron inserted along edge to hold pouch open. Pouch is attached to long pole. Designed to catch bulk grain from falling stream. See Fig. 2. 3. Ellis cup. Manual device constructed of lightweight aluminum designed to draw samples from bulk grain moving on conveyor belt. See Fig. 3.
5、4. Sample divider. Device used to reduce size of sample while representing original sample. Each time sample passes through device, it is divided into two approximately equal portions. Fig. 1. Double-tube compartment probe. Sampling AACC Method 64-70A Page 2 of 6 Manual Sampling of Wheat and Other W
6、hole Grains (continued) Procedure Use of probe 1. Bulk grain in stationary containers (cars, trucks, wagons, or barges) can be sampled with double-tube compartment probe of sufficient length to reach bot- tom of container. In addition to probe, sampling canvas constructed of heavy cloth or similar m
7、aterial 15 cm longer than probe is used. 2. Probe patterns have been established for various containers. They are based on evenly distributing probings in different parts of car, truck, wagon, barge, or Fig. 2. Pelican. Fig. 3. Ellis cup. Sampling AACC Method 64-70A Page 3 of 6 Manual Sampling of Wh
8、eat and Other Whole Grains (continued) other container. Each lot shall be probed in as many additional locations as are necessary to assure that the sample is the required size and representative of the lot. Additional probes shall be drawn in a balanced manner. 3 Insert probe at 10-degree angle fro
9、m vertical with slots facing upward and completely closed. Once inserted, open slots and move probe up and down quickly in two short motions. Close slots completely and withdraw at each depth for uniformity of kind, quality, and condition. 4 When railroad boxcar of bulk grain is probed, probe approx
10、imately (A) in center of car; (B) 11.5 m back from doorpost and approximately 0.71.3 m out from side of car; (C) 11.5 m from same end and approximately 0.5 m from opposite side of B; (D) same as (B) except opposite side; and (E) same as (C) except opposite end. See Fig. 4. The slots in the probe fac
11、e toward the end of the car. 5. When sampling 3-compartment, trough- or door-type hopper cars, insert probe in direction of the arrow at an approximately 10-degree angle. See Fig. 5. The probe may be inserted either in the center of each hopper or slightly off center in order to miss the cross beam.
12、 6. When probing 3-compartment, 10-hatch-type hopper cars, insert probe in the direction of the arrow at approximately 10-degree angle. See Fig. 6. Fig. 4. Probe patterncar. Fig. 5. Three-compartment, trough- or door-type hopper car. Sampling AACC Method 64-70A Page 4 of 6 Manual Sampling of Wheat a
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