Ash Gauging



EyeGraffix is a remote monitoring software application for the Bretby Gammatech Ash Eye and Heat Eye ash monitoring systems. It allows users to see the current status of the system and quality of coal being monitored as well as being able to display historical activity, generating reports and exporting data in formats that can be used by other applications. The system also alerts users to system problems or changes on coal quality, using audible alerts, graphical icons or emails.

Features: Connect to up to 25 Ash-Eye/Heat-Eye systems simultaneously. Alerts user to levels outside of normal limits (ash content, calorific value, etc.). Shows a graphical representation of current and historical parameters. Connects to systems over RS232/RS485 serial communications, FibreOptic or Ethernet. Mutliple EyeGraffix terminals can be used in a system using a LAN/WAN network to link together (only one physical connection to each Ash-Eye/Heat-Eye system is required). Generation of reports in Microsoft™ Excel or generic spreadsheet format. Multiple reports can be configured to be generated automatically at regular intervals and emailed to recipients. System alerts can be notified to users by email, with the ability to define how long an alert must be active for before being emailed out. Remote viewing and setting of Ash-Eye/Heat-Eye system parameters and sensor status. Settings of user defined limits for monitored parameters.

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EyeGraffix Fact Sheet



Ash Eye - On-Line Ash Monitor

Overview: The Ash Eye is a much improved instrument based upon the previous Bretby Gammatech Natural Gamma Coal Quality Monitor (NGCQM). It is a non-contacting, fully on-line ash monitor providing second-by-second information on the ash content of conveyed coal. The Ash Eye contains no radio active sources as it uses Natural Gamma Technology and incorporates a new and improved algorithm leading to greater consistency in ash measurement.

Principle of operation: The dirt associated with coal contains a much higher concentration of radioactive material than the coal itself. The signal from a natural gamma detector mounted under the conveyor belt contains ash information. When this signal is combined with the mass of the material from a beltweigher a measurement of the ash content can be obtained.

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Hand Held Ash Probe

The Ash Probe is a hand portable instrument for measuring the ash content of stock piles, wagons or trucks of coal. It provides the user with ash readings within seconds. It contains no radioactive sources. The latest version has the Display Unit housed in a new carry case incorporating a shoulder strap and removable lid. These new features make the Ash Probe even easier to use in the field. The internal configuration of probe has also been updated which has improved its robustness. The software has recently been updated to enable "Stock Pile Mode" or "Truck Mode" operation. With these new modes the user is lead through the appropriate operation without needing to remember what buttons to press. There is also a "Calibration Mode". Stock Pile Mode is suitable for stock piles that may need many probings. For growing stock piles data can be added to at any time. Truck Mode is suitable for Truck (Wagon or Lorry) deliveries where a relatively small number of probings is required (<12) and once completed the data cannot be added to.

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Handeld Ash Probe


Gamma Eye Bucket Monitor

The Bucket Monitor provides a quick assessment of the bulk gamma contamination of excavated material within the bucket of a mechanical digger. This instrument contains a large scintillation crystal which is mounted within a substantial frame. The sensor is pre-calibrated for the contamination isotope of interest and can be set to alarm for discrete activity bands. The driver of the mechanical digger rests the bucket containing the excavated material on the frame and after a few seconds it provides him with a visual indication of the level of gamma contamination in the bucket. This indication is provided by a traffic light system - red, amber and green denoting the band within which the gamma contamination occurs. On the basis of this information the driver deposits the load in the appropriate place for subsequent disposal or processing. During operation no personnel are required to take meter readings which is a key safety feature. Once calibrated the 'Bucket Monitor' is very simple and rapid to use. No specialist nucleonic knowledge is required by the operator. The driver simply observes and acts upon the traffic light indications. He does not even need to activate the counting process as the instrument automatically senses when the bucket is correctly positioned. This instrument has already found applications at five different sites.

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eye on belt monitor174-ash-monitor-4
Gamma Eye On-belt Monitor
The Gamma Eye is a fully on-line system providing a continuous assessment of the gamma activity of a conveyed load. In this instrument a large scintillation crystal is mounted over the conveyor transporting material such as soil, rubble or other bulk debris, suspected of being gamma contaminated. As with the Bucket Monitor it works on a gross gamma signal and can be pre-calibrated for the contamination isotopes of interest. It provides a visual and audible warning if a user-selectable predetermined gamma count level has been exceeded. The instrument can, for example, provide signals to activate a diverter to deflect material above a specified activity level off the conveyor. Alternatively, the Control Unit can provide a 'lock out' signal to the conveyor. The conveyor can only be restarted when the offending material, such as a radium dial, has been removed and the gamma count level has reduced to below the set threshold. The throughput is only limited by the feed rate to and the capacity of the conveyor. As with the bucket monitor there are no moving parts and it is simple to set up and use. The Belt Monitor is powered by a standard 120-240VAC 50Hz supply.

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Gamma Eye Brochure

heat on ash eye monitor

Heat Eye Ash Monitor

The Heat Eye is a new instrument providing second-by-second information on the Ash, Moisture and Nett Calorific Value (Nett CV) of conveyed coal. This gives the principal benefit of providing higher quality product with a consistent Nett CV - with obvious savings in time and money. It comprises a Bretby Gammatech Ash Eye (updated NGCQM) fully integrated with a Moisture Monitor (eg the Callidan MA-500). The Heat Eye contains no radioactive sources - it uses Natural Gamma and Microwave Technology.

Principle of operation: The Heat Eye combines the instantaneous ash and moisture measurements to obtain an instantaneous “total innerts” value. This total innerts value is converted into Nett CV by using a calibration based upon the correlation of total innerts with Nett CV previously measured by conventional means.

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Heat Eye

ash lab monitor

Lab Ash Monitor

The LabAsh is a laboratory instrument providing a quick measurement of the ash content of a crushed sample of coal. It is easy to use and provides accurate results within a few minutes. The LabAsh comprises two parts: a Sample Measuring Chamber and a Display Unit. The Sample Chamber is a substantial lead walled cylinder containing a scintillation crystal and associated electronics. The crystal is positioned vertically in the centre of the chamber so that when a special beaker containing the coal sample is lowered into position the crystal is evenly surrounded by the sample. The mains powered Display Unit provides the user interface and is housed in a case suitable for desk or bench top operation.

Main Features: Simple to use, Accurate results within a few minutes (<5 minutes), Stores up to 300 sample measurements, Facility to include: data, batch and sample name into each record, Easy to calibrate on site using normal production samples, Can store up to 9 different calibrations for multi-source applications & Can download data to a computer.

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Lab Ash

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