LS/T 6117-2016Inspection of grain and oils. Determination of test weight. Waterlogged suspend method (English PDF)

3.1 Waterlogged suspend method

The method of submerging the grain sample to be tested in water and hanging it to measure the test weight.

6.1 Instrument preparation

6.1.1 Prepare the instrument according to the instruction manual.

6.1.2 Place the test-weight device on a stable operating platform, and fill the operating water tank with tap water to the marked line. Soak the measuring vessel in the operating water tank. Adjust the test-weight device to the level and turn on the power. Use standard weights to calibrate the weighing device according to the instructions.

6.1.3 If the test-weight device is not used for a long time or used continuously for more than 100 times, it shall be calibrated according to the requirements of the instrument instruction manual.

6.2 Constant mass measuring vessel

6.2.1 The absolute value of the difference between the water temperature and the

ambient temperature is <=5 °C, and the ambient temperature shall generally be 5 °C ~

40 °C.

6.2.2 Cover the measuring vessel and fasten it tightly; hang it on the lower scale hook of the weighing device; suspend it in the operating water tank for weighing; record the weighing value as m 1 after the weighing value is stable.

6.3 Sample preparation

6.3.1 Sampling and dividing

Perform sampling and dividing according to GB 5491.

6.3.2 Sample preparation

6.3.2.1 Separate two parts of approximately 1 000 g each from the average sample.

According to the specified sieve layer (corn upper sieve phi12.0 mm, lower sieve phi3.0 mm; wheat upper sieve phi4.5 mm, lower sieve phi1.5 mm), sieve in 4 times, and the mass of each screening is about 250 g. Sort out the large impurities on the upper sieve and discard the undersize of the lower sieve; combine the grain grains on the upper and lower sieves; mix them as the samples to be tested.