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L75 / 120LT (DIL Dilatometer)

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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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Specifications : 

Linear measurement range: +/-1300um(+/-0,5%FS)
  +/-1600um(+/-2,0%FS)
  +/-1400(+/-1,0%FS)
  +/-1800(+/-10%FS)
Resolution:    1.25 µm
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
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