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Online Coal Ash Analyzer

Ash content of coal is basically defined as the percentage residue of coal after being burnt at a certain temperature. The Ash Content can also be considered as an indirect measurement of the Calorific Value of Coal and is an important technical indicator and one of the main basis for evaluation of coal quality and sales price. Thus monitoring and controlling the Ash Content in Coal is an important factor in determination of Coal Quality. Ash Content is of great significance for social and economic benefits of enterprises. The Online Ash Analyzer uses a dual Gamma - ray penetration method to eliminate the influence of coal porosity, particle size and other factors and to rapidly measure the coal ash and calorific value. This method is the most commonly used technique for fast online Coal Quality Analyzer. This analysis method uses a radioisotope that has a low energy level, and can be used for a long time without requiring replacement, has low radiation and is safe and reliable. This analyser finds extensive use in Coal Mining, Coal Washeries, Coal Blending Plants, Thermal Power Plants, Coking Plants, etc.
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Key Features

Online Continuous Measuring, Real-Time display of the Ash Content The instrument is based on the principle of the reactions that take place inside the nucleus of the elements being analysed. Due to the excitation of the nucleus, different elements will emit Gamma rays with their own characteristics, This system is programmed to identify the different nucleus types by analysing the y-ray peak value emitted and quantify the elements through the analysis of y-ray peak area.
The detection device is placed above the conveyor belt while the radioactive source is positioned below the belt. When coal flow through the analysis section which is irradiated by the Radioactive source, some radio nuclide will produce inelastic scattered reaction with high-energy neutrons to emit characteristic y-rays. The arrangement of the detector and the neutron generator has a slow integration and some high-energy neutrons will become low-energy ones because of this slow integration The low-energy neutrons generate and emit characteristic y-rays. The detection system analyses element types contained in the material based on y-ray energy and determine weight percentage content based on the corresponding peak area.
Uses Dual y(Gamma Ray) source: Am-241 and Cs-137

  • The Measuring Arm can be rotated to align with the Conveyor Belt. It alos allows eay access to the system whenever required.
  • A Standard Test Block is supplied as standard accessory using which the system can automatically adjust cumulative drift of the instrument.
  • An optional Thermostat system can be integrated into the instrument for harsh climates
  • The system is very easy to Install and Maintain.
  • The Ash Analyzer supports long-distance communication. The detector and the host computer can be kept more than 1,000 meters apart

Technical Specifications*


Online Coal Ash Analyzer


Low Ash Coal (ash content <15%), basic error: < 0.5%.


Medium Ash Coal (ash content of 15% to 25%, basic error: < 1%.

High Ash Coal (ash content> 45%), basic error: <+-2%.


Repeated measurements of the same coal of 5 minutes' frequency displayed an average coefficient of variation less than 1%.

Static stability

The instrument system can operate at temperatures upto 50 deg C

Can measure different types of incoming coal on the belt. The probe has to be calibrated as per coal type or previous calibration values selected.
Permits signal transmission within 1000 meters without interference. Additional signal amplifiers can be integrated for larger distances

Power supply voltage

AC 220V 10V, 50Hz,

Power consumption

500W approximately

Note: Due to process of continuous improvements, specifications are subject to change without prior notice


  • Ash sensor : NaI crystal Photomultiplier, pre-amplifier, high-voltage power supply unit, constant temperature facility
  • Onside controller : AC power supplying system, DC-power supply data-switching facility
  • Engineering PC : Engineering PC with accessories Software

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