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.