The Audibert-Arnu Dilatometer is one of the essential coal testing instruments, specifically designed for measuring the swelling index of bituminous coal.

The computer-controlled system adheres to the national standard GB/T5450-1997 for temperature regulation and graphical plotting, displaying real-time coal sample expansion curves.

Features:

• Real-time display of control temperature, heating rate, working time, and current opening.
• Online operation and control of coal testing processes.
• Automatic calculation and printing of:
  • Softening temperature (T1)
  • Initial expansion temperature (T2)
  • Solidification temperature (T3)
  • Maximum contraction (a)
  • Maximum expansion (b)
  • Expansion curves and analysis reports.
• Automatic storage of test data for easy retrieval of coal analysis results.

Technical Parameters:

• Temperature Range: 0–999°C
• Accuracy: Class 0.5, Resolution: 1°C
• Time Measurement Range: 0–999 min
• Time Measurement Precision: ±30 s/24h, Resolution: 0.1 min
• Power: < 5 kW
• Power Supply: 220V±10%, 50 Hz