LS/T 6117-2016 English PDF (LST6117-2016)

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LS/T 6117-2016: Inspection of grain and oils. Determination of test weight. Waterlogged suspend method
LS/T 6117-2016
LS
FOOD INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.050
B 20
Inspection of grain and oils - Determination of test weight -
Waterlogged suspend method
ISSUED ON: JUNE 30, 2016
IMPLEMENTED ON: NOVEMBER 01, 2016
Issued by: State Grain Administration
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Principle ... 4
5 Instruments and equipment ... 5
6 Operation methods ... 5
7 Result calculation ... 6
Appendix A (Informative) Schematic diagram of instrument structure and sample
drawing of main components ... 8
Inspection of grain and oils - Determination of test weight -
Waterlogged suspend method
1 Scope
This Standard specifies the principle, instruments and equipment, operation methods
and result calculation for the determination of test weight of corn, wheat and other
grains by the waterlogged suspend method.
This Standard applies to the rapid determination of test weight of grains such as corn
and wheat.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB 5491, Inspection of grain and oilseeds - Methods for sampling and sample
reduction
GB/T 5498, Inspection of grain and oils - Determination of test weight
LS/T 6401, Test instrument of grain and oils - Waterlogged suspend method to
measure grain bulk density - Technical requirements and test method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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.
4 Principle
Using the principle of buoyancy, weigh a whole grain sample of a certain mass and put
it into a measuring vessel; completely immerse it in water; remove air bubbles; weigh
the mass of the grain in this state; calculate the density of the sample; convert it to the
test weight of standard water (for example: corn 14.0%).
5 Instruments and equipment
Waterlogged suspend method test-weight device: see Appendix A for the schematic
diagram of the instrument structure. The instrument shall meet the requirements of LS/T
6401.
6 Operation methods
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 m1 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 ϕ12.0 mm, lower sieve ϕ3.0
mm; wheat upper sieve ϕ4.5 mm, lower sieve ϕ1.5 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.