Ash Fusion Determination
AF700 Ash Fusibility Determinator
Accurate Automatic Ash Fusion Determination
The LECO AF700 is an ash fusion determinator designed to automatically determine ash fusibility temperatures (initial deformation, softening, hemispherical, and fluid temperatures) in coal and coke ash. Using a high-temperature horizontal furnace combined with image recognition software, the instrument monitors cone deformation during heating under controlled oxidizing or reducing atmospheres. AF700 complies with ASTM standards for ash fusion testing.
Why Choose the LECO AF700
Automated Monitoring with Image Recognition
The AF700’s Image Recognition Function (IRF) eliminates subjective visual interpretation while improving consistency and reliability across operators and labs. Automated sample monitoring provides objective, repeatable detection of ash deformation stages:
- Initial Deformation (IT)
- Softening (ST)
- Hemisphere (HT)
- Fluid/Flow (FT)
Multi-Sample Capacity with Dual Configuration
Dual configuration allows multiple simultaneous analyses, increasing throughput and reducing downtime. This unique advantage makes the AF700 ideal for high-volume labs.
High-Endurance Furnace
Delivers precise temperature control and uniform heating essential for accurate ash fusion analysis by supporting both oxidizing and reducing atmospheres.
Full Image Archiving and Traceability
Store complete image histories for each sample, enabling post-analysis review and quality assurance.
Instrument Applications
Core Analyses
How the AF700 Works
The LECO AF700 is an ash fusibility determinator that automatically monitors ash cone deformation temperatures in coal ash and coke ash. Prepared ash cones are mounted on a ceramic tray and placed into a high-temperature ramping furnace. The user selects an analytical method with a predefined furnace atmosphere (oxidizing or reducing) and a ramp rate (°C/min) for the furnace.
Next, a digital camera collects images after the furnace temperature reaches the method-defined starting point.
Ash deformation stages may be automatically determined using Image Recognition Functions (IRF) within the software. In addition, IRF allows the option of analysis to be automatically terminated after all deformation points have been reached for all samples, increasing throughput and furnace lifetime. A complete image history for all analyzed samples is digitally archived for easy retrieval and review. Archived images may be used to make subjective determinations of deformation temperatures.
Instrument Details
Features
Models
Options
Applicable Methods
The LECO AF700 adheres to these approved methods.
ASTM D1857 Standard Test Method for Fusibility of Coal and Coke Ash
Instrument Support
Ensure reliable instrument performance with extensive support, training, and maintenance services. Need tailored support for your thermal analysis instruments? Our experts are standing by.
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