L75 / 120LT (DIL Dilatometer)
The LINSEIS dilatometer L75/120LT was developed to measure the expansion of polymer samples. Hereby up to 8 different samples can be measured simultaneously in a temperature range of –40°C up to +160°C. To cover the temperature range a commonly available climate chamber is used that incorporates a cooling generator and a heat source. The measuring sensors are mounted on top of the heat chamber and connect through a hole into the chamber. The complete arrangement is airtight, in order to avoid the intrusion of humidity into the measuring chamber.
Optionally a humidity chamber can be selected to control both temperature and humidity in the sample chamber. It is possible to connect a gas box to the measuring chamber. The temperature measurement is done by means of 4 thermocouples which are hanging always between 2 samples.
This arrangement enables to get a good temperature profile over the measuring chamber. The change of the length of the samples over the temperature change is measured with a LVDT sensor (linear variable differential transformer). This sensor has a very high resolution of 14nm (Nanometer) 10E-9. All 8 LVDT`s are connected to the data acquisition. The normally used polymer samples can have a length of 80 up to 100mm. The cross-section of the samples can be 4 x 10mm up to 15 x 15mm.
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|Linear measurement range||+/-1300um(+/-0,5%FS)|
|Measuring principle||LVDT (differential transformer)|
|Automatic zero adjustment||Yes|
|Sample load||(adjustable) 50 up to 500 mN|
|Sample holder material||Fused Silica|
|Sample dimension||4 x 10 x 80 up to 100mm|
|Temperature range||-40°C up to +160°C|