The HTJC-8 Microcomputer-based Caking Index Tester is designed to measure the caking index of bituminous coal, characterize the properties of coke, and evaluate the quality of coking coal, production coal, and commercial coal. It serves as essential equipment for laboratories in coal washing plants and coking plants. This instrument is suitable for determining the caking index of bituminous coal, including three key indicators: maximum thickness of the plastic layer (Y), final contraction (X), and the volume curve. It complies with the requirements of GB/T 479 “Determination of Caking Index of Bituminous Coal.”

Featuring user-friendly design and advanced computer software control technology, the tester enables automatic measurement and graphing, significantly reducing operational complexity. With high measurement accuracy, simple operation, and stable performance, it is widely used in coal quality testing departments across industries such as coal, metallurgy, and coking.

Features of the Microcomputer-based Caking Index Tester:

1. Complies with GB/T 479-2000 “Determination of Caking Index of Bituminous Coal.”
2. Enables bidirectional communication between the computer and controller for real-time monitoring.
3. Supports simultaneous dual-furnace (front and rear) control or independent front-furnace operation.
4. Automatically plots volume curves for single or dual furnaces and temperature-time curves.
5. Uses a displacement sensor instead of a drum clock, displaying real-time X volume curve trends and calculations on the computer screen.
6. Manual input of plastic layer data via computer, which then analyzes and processes the data to calculate the Y-value (plastic layer thickness) and automatically plots upper/lower plastic layer curves.
7. Automatically records furnace temperatures every 10 minutes and provides an alarm reminder every 10 minutes after reaching 250°C.
8. Automatically calculates test results and prints test records and reports.
9. Auto-recovery function: Restores operation to pre-power interruption status upon power restoration.
10. High measurement accuracy: Automatic cold-junction compensation for thermocouples, nonlinear correction, and error compensation ensure temperature display accuracy within ±3°C.
11. Stores historical test data for query and printing.

Technical Parameters:

1. Temperature display range: 0–999°C, resolution 0.1°C (K-type thermocouple).
2. Time display range: 0–999 min, resolution 0.1 min.
3. Operating environment: 5–40°C, relative humidity ≤80%.
4. Heating control: Reaches 250°C in 30 minutes; maintains a heating rate of 3°C/min between 250°C and 730°C.
5. Time display error: ≤10 seconds within 24 hours.
6. Continuous operation time: 24 hours.
7. Cold-junction compensation: 0–60°C.
8. Pressure sensor range: (0–20) kg.
9. Displacement sensor range: (0–200) mm.
10. Power supply: 220 V (±10%), 50 Hz.
11. Power consumption: ≤5 kW.
12. Automatic alarm: Sounds every 10 minutes after 250°C to prompt plastic layer data recording.
13. Dimensions:
14. Main unit: 800 × 400 × 580 mm
15. Controller: 330 × 290 × 120 mm
16. Weight: 150 kg.