The Parker's Ash Eye coal quality monitoring system has no moving parts and produces trend data in real-time rather than by the traditional method of laboratory analysis. This measurement is vital for decision making. The system combines the signals from the two gamma sensors with those from a belt weigher to provide a fully on-line second by second calculated ash content. Unlike other ash monitors, the Parker Ash Eye does not contain any radioactive sources and is insensitive to iron or calcium variations. It can also be installed on steel corded belts (unlike dual energy gamma transmission systems).

The accuracy of the Ash Eye depends upon the site and the belt weigher. Accuracies of better than 0.5% ash on final product and 1-3% on run-of-mine have regularly been achieved. A precision of 0.5% ash can be achieved with final product systems (measured to ISO15239).

The Standard Ash Eye - This is an Ash Sensor that is fully conveyor mounted; it has two 4-20mA outputs which can be configured for Instantaneous Ash, Instantaneous Tonnage Rate or Shift Accumulated Ash. It also has a Serial Output of all the measured and calculated parameters. These outputs can be fed to an existing computer control system for display, archive and analysis.

The Full Ash Eye - The Full Ash Eye incorporates the EyeGraffix PC based Display/Archive/Retrieval system for use where the user has no SCADA computer monitoring system. Like all Parker Bretby Gammatech products, Ash Eye uses Natural Gamma Technology, rather than radioactive sources, which means they are much safer and require no specialist de-commissioning equipment or procedures

Industries:
• Quarrying
• Mining

Features / Benefits:
• Simple, secure menu-driven operation, with automatic restart upon restoration of power
• Real-time numerical displays of current ash content, the shift ash content, the current tonnes per hour flow rate and the total shift tonnes.
• Up to four calibrations to handle different coal types.
• Up to eight different coal types can be accommodated.
• User-definable shift pattern with comprehensive end-of-shift reporting.
• Archival and retrieval of shift reports.
• Two 4 to 20mA Analogue outputs which can be set to the current ash content, the shift ash content or the current tonnes per hour flow rate.
 • Two Relay outputs (c/o contacts) which can be set to operate on a critical system fault, a non-critical system fault, the current ash content below a target band, within a target band or above a target band.
 • User-definable quality parameters (target ash content and desired ash band).
• Downloading of information to Multi-Media-Card (MMC) or RS232 Serial port to allow more comprehensive user analysis (usually in conjunction with other user-supplied data).
• Optional serial output (RS232/RS485) of percentage ash, tonnage and various other house keeping data for onward transmission to the customer’s computer control system or the optional Bretby Gammatech EyeGraffix software system.
• Can be synchronised with the customer’s auto-sampler for dynamic calibration and/or for performance monitoring purposes.

Applications:
• Run-of-Mine (ROM) Monitoring or Raw Coal Monitoring
• Control of diverting systems for high ash material
• Washed Coal - for input to washing plant control system
• Blending control systems
• Final product monitoring
• Monitoring Coal Deliveries at Power Plants, Steel Works & Cement Works
• Boiler feed monitoring