Dilatometer DL4000

DL 4000 Coal Dilatometer is a fully automatic system for determining the swelling properties of hard coal when heated under standard conditions: dilatation and contraction are obtained by inserting a sample of powdered coal, formed under pressure, in a narrow tube topped by a piston and reading the displacement of the piston as a function of the temperature



ISO Standard 349, DIN 51 739, ISO 8264, ASTM D 5515 and ISO 23873 specify slightly different methods for such determination.

DL 4000 performs dilatometer tests according to ALL the above mentioned standards: dilatation and contraction of 2 samples, loaded in 2 tubes, are measured at the same time, by means of precision transducers.

The Standard Test Method can be easily selected from the front panel before starting a test. The double furnace version productivity is considerably increased due to the reduction of the heating and cooling waiting times.

All the analysis procedure, even the insertion and removal of the tubes into the furnace, is automatic: the operator needs only to load the sample, to place the tubes above the furnace and to start the system.

Once started, DL 4000 will preheat the furnace, insert the tubes into the furnace, restore the start temperature, raise the temperature at uniform rate, and carry out the tests results.

Furnace temperature together with the dilatation and contraction readings are displayed and printed during the test.


Working temperature range 250 ÷ 600 °C
Temp. rise rate set 0.5 ÷ 9.9 °C/min
Displacement transducers LVDTs
Tubes movement fully automatic (not in “K” Version)
Temperature display °C
Dilatation display – 50 % ÷ + 300 % (normal samples) – 100% ÷ + 600 % (short samples)
Dilatation resolution 1 %
Data print interval 60 seconds
Alphanumeric printer non impact type
System diagnostics automatic at start up
Host computer interface RS 232 C
Power supply (single furnace) 230 / 120 V – 1.8 kVA max
Power supply (double furnace) 230 / 120 V – 3.6 kVA max


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