FAQ
We have listed some common questions about the sampling system and automatic analytics system. If you are confused about our machines or not clear about how to use, you can find answers in here. Of course, you can contact us directly. we are pleased to see you！
What's the meaning of "As received basis", "Air dried basis", "Dry basis and Dry ash-free basis"?
1. As received basis: Coal in the condition as received by the consumer or the laboratory analyzing the coal. (This kind of coal includes all contents: Organic constituent, inorganic constituent (Inherent moisture, free moisture). Use the coal as received basis to represent coal content)
2. Air dried basis: The coal has naturally dried in the open air until it cannot dry or dissipate any more moisture. Use the coal on the air-dried basis to represent coal content.
3. Dry basis: An analysis expressed on the basis of a coal sample from which the total moisture has in theory been removed. Coal in dry basis includes all contents but moisture. Use the coal on the dry basis to represent coal content.
4. Dry ash-free basis: An analysis expressed on the basis of a coal sample from which the total moisture and the ash have in theory been removed. Use the coal on the air-dried basis to represent coal content.1. As received basis: Coal in the condition as received by the consumer or the laboratory analyzing the coal. (This kind of coal includes all contents: Organic constituent, inorganic constituent (Inherent moisture, free moisture). Use the coal as received basis to represent coal content)
2. Air dried basis: The coal has naturally dried in the open air until it cannot dry or dissipate any more moisture. Use the coal on the air-dried basis to represent coal content.
3. Dry basis: An analysis expressed on the basis of a coal sample from which the total moisture has in theory been removed. Coal in dry basis includes all contents but moisture. Use the coal on the dry basis to represent coal content.
4. Dry ash-free basis: An analysis expressed on the basis of a coal sample from which the total moisture and the ash have in theory been removed. Use the coal on the air-dried basis to represent coal content.
What is the calorific value?
Calorific value is the heat produced by combustion of a unit quantity of a substance under specified conditions.