Ash Analyzer (AA-N) is a safe and reliable online analytical instrument with distinguished performance. It can be applied to the real-time online measurement on ash content in coal. Thus, the instrument contains no radioactive substance itself, it doesn’t emit radioactive ray and is radiationless, safe and reliable. It can be used in the measurement of coal putting into the furnace of thermal power plant, raw coal of coal dressing plant, coming coal of coal washing plant, etc.