Terms and definitions of coal mechanization sampling methodsCoal sample: A representative portion of coal taken from coal to determine certain characteristics.
Test coal sample: A coal sample prepared to meet a specific test requirement.
Common coal sample: A coal sample taken for multiple experiments.
Moisture coal sample: A coal sample specially taken to determine total moisture.
General analysis and testing of coal samples: coal samples broken to a particle size of less than 0.2mm and reaching an air-dried state, which are used for the determination of most physical and chemical properties.
Particle size analysis coal sample: Coal sample specially taken for particle size analysis.
Sampling: The process of taking a representative portion of coal from a large amount of coal.
Sub-sample: A sample taken when the sampling device is operated once or a full cross-section of the coal flow is taken.
Primary Subsample: Subsample taken before the first stage of sampling, before any fragmentation and reduction.
Divided sample: A portion that is retained after being reduced to reduce the mass of the sample.
Total sample: Coal sample obtained by merging all sub-samples taken from a sampling unit.
Sampling: A coal sample composed of several primary sub-samples evenly distributed throughout the sampling unit.
Sampling unit: Take a total sample of coal from a batch of coal. A batch of coal can be one or more sampling units.
Note: Equivalent to the sub-lot in ISO13909 (part of the coal in a batch of coal, which gives the required test result).
Lot: An independent amount of coal for which overall property determination is required.
Continuous sampling: Take a total sample from each sampling unit. When sampling, the sub-sample points are distributed at even intervals.