DIL L75 HP High Pressure Dilatometer

Expansion measurements under temperature and pressure


On point

The Linseis high-pressure dilatometer DIL L75 HP introduces groundbreaking possibilities in thermal analysis. This innovative system is capable of measuring material expansions (length changes) within a wide temperature range, spanning from room temperature (RT) up to 1100/1400/1800°C, while also accommodating a remarkable pressure range of up to 100/150 bar.

This high-pressure dilatometer stands as the sole instrument worldwide dedicated to the study of thermal expansion under high-pressure conditions. It offers the flexibility of optional components such as a steam generator and a comprehensive gas control system.

For a more comprehensive understanding of your measurements, an analysis of effluent gases can be seamlessly integrated into your experiments using a QMS (Quadrupole Mass Spectrometry) or FTIR (Fourier Transform Infrared Spectroscopy) system at any point. What sets this system apart is that the coupling is not merely an assembly of individual components; it leverages LINSEIS’ expertise in system integration, combining both hardware and software elements. To aid in result interpretation, various libraries are at your disposal, enhancing the value of your research.


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Model DIL L75 HP/1**
Temperature range:  RT up to 1100°C
Price range: $$$
Max. pressure: max. 150 bar
Vacuum: 10E-4 mbar
Sample holder: fused silicia < 1100°C, Al2O3 < 1750°C
Max. sample length: 50 mm
Sample diameter: 7/12/20 mm
Adjustable sample pressure: up to 1000 mN
Measuring range: 500 / 5000 µm
Resolution: 0,125 nm
Options: Pressure controllable Gas Mixing System (MFC´s)
Atmosphere: inert, oxid.*, red., vac.
Model DIL L75 HP/2**
Temperature range:  RT bis 1400/1800°C
Price range: $$$
Max. pressure: max. 100 bar
Vacuum: 10E-4 mbar
Sample holder: fused silicia < 1100°C, Al2O3 < 1750°C
Max. sample length: 50 mm
Sample diameter: 7/12/20 mm
Adjustable sample pressure: up to 1000 mN
Measuring range: 500 / 5000 µm
Resolution: 0,125 nm
Options: Pressure controllable Gas Mixing System (MFC´s)
Atmosphere: inert, oxid.*, red., vac.

Accessories for pressure dilatometer

The system offers a range of options and accessories to enhance its versatility and functionality:

  1. Diverse sample holders with different designs and materials to accommodate various types of samples.
  2. Instrumentation for sample preparation, facilitating the process of getting samples ready for testing.
  3. The capability to input sample length data online using Vernier calipers, streamlining the measurement process.
  4. The availability of software options for rate-controlled sintering (RCS), enabling precise control over sintering processes.
  5. A selection of both rotary and turbo-molecular pumps to cater to different vacuum requirements.
  6. A choice of manual, semi-automatic, and automatic (MFC) Gas Boxes that can support up to four different gases, offering flexibility in creating specific test atmospheres.
  7. LN2 cooling for efficient temperature control and cooling during experiments.
  8. The possibility to operate the system under H2, allowing for specialized testing in hydrogen-rich environments.

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All LINSEIS thermo-analytical instruments are seamlessly integrated with PC control, exclusively operating under Microsoft® Windows® operating systems. The comprehensive software package consists of three distinct modules: temperature control, data acquisition, and data evaluation. This 32-bit software encompasses all the crucial functionalities necessary for the seamless preparation, execution, and assessment of Dilatometer measurements. Our team of specialists and application experts has worked diligently to craft a user-friendly and all-encompassing software application.

Key Features of DIL Software:

  1. Evaluation of glass transition and softening points, enabling a thorough analysis of material behavior.
  2. Automated softening point detection with software-controlled system shutdown, ensuring precise and safe operation.
  3. Display of both relative and absolute shrinkage or expansion curves, offering clear visualization of material dimensional changes.
  4. Presentation and calculation of technical and physical expansion coefficients, facilitating the assessment of material properties.
  5. Integration of Rate Controlled Sintering (RCS) software for precise control and evaluation of sintering processes.
  6. In-depth analysis of the sintering process, allowing for comprehensive evaluation and optimization.
  7. Semiautomatic evaluation functions that streamline the data analysis process, enhancing efficiency.
  8. Incorporation of several system correction features, ensuring the accuracy and reliability of measurement results.
  9. Automatic zero-point adjustment and software-controlled sample pressure adjustment for precise and convenient measurements.

General Features:

  1. Program with text editing capabilities, enabling flexible and customized experiment setups.
  2. Robust data security mechanisms to safeguard against data loss in the event of a power failure or unexpected interruption.
  3. Thermocouple break protection, ensuring the reliability of temperature measurements during experiments.
  4. Effortless repetition of measurements with minimal parameter input, streamlining experimental procedures.
  5. Real-time evaluation of ongoing measurements, allowing for immediate analysis and decision-making.
  6. Convenient curve comparison with the ability to overlay and analyze up to 32 curves simultaneously.
  7. Versatile storage and export options for evaluations, enhancing data management and accessibility.
  8. Support for data export and import in ASCII format, enabling seamless data exchange with other systems.
  9. Data export functionality to Microsoft Excel for comprehensive data analysis and reporting.
  10. Multi-methods analysis capability, accommodating a range of thermal analysis techniques such as DSC (Differential Scanning Calorimetry), TG (Thermogravimetry), TMA (Thermomechanical Analysis), and DIL (Dilatometry).
  11. Zoom function for in-depth examination and analysis of specific data segments.
  12. First and second derivation features for advanced data interpretation.
  13. Programmable gas control, allowing precise management of gas atmospheres during experiments.
  14. Statistical evaluation package for in-depth statistical analysis of measurement results.
  15. Free scaling, providing flexibility in scaling and adjusting data for tailored analysis and presentation.


Application example: Rock – Crystal (Calculated DTA)

The L75 Dilatometer is a valuable tool for precisely assessing the thermal expansion characteristics of rock crystal. With the added DTA (Differential Thermal Analysis) feature, a deeper understanding of the material’s thermal behavior can be achieved. DTA measurements involve a mathematical routine that relies on monitoring the sample’s temperature.

During dynamic heating or cooling cycles, exothermic and endothermic effects impact the sample’s temperature. Notably, around 575°C, a phase transition occurs within the material. The difference between the measured temperature and the literature value (574°C) serves as a useful reference for temperature calibration, enhancing the precision of the analysis.

Application example

Under an argon atmosphere, the analysis focuses on determining the linear thermal expansion (delta L) and the Coefficient of Thermal Expansion (CTE) of the sample. The experiment involves a controlled heating rate of 5 K/min. At the point where the temperature reached 736.3°C, which corresponds to the peak temperature for CTE, a noticeable shrinkage in the sample occurred. This phenomenon is linked to a significant change in the atomic structure, commonly referred to as the Curie point.

Any variation between the measured result and the expected literature value is likely attributed to sample contamination, highlighting the impact of impurities on the experimental outcome.

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