Swelling rate (increase in volume when heated) is an important indicator of the quality of coal for coking. It is determined by a standard dilatometric test.
From the expansion curves the following numerical parameters of the tested coal samples are obtained.
| Working range of sample heating | 200 to 600°C |
| Setting of temperature alarm | 500 to 600°C |
| Accuracy of temperature control | ±1°C / 10 min |
| Power supply | 230 V, 50 Hz |
| Measurement of pistons' shifts | Contactless |
| Manipulation with measuring tubes | Fully automated |
| Temperature gradient: | Up to 10°C /min |
| Duration of one measuring cycle | 120 minutes |
| Dimensions | 700 x 250 x 900 mm (with tubes up 1450 mm) |
