DIL L74 Heating Microscope

Largest temperature range (-150°C to 2000°C) and vacuum tight sample chamber


On point

The Linseis DIL L74 HM Heating Microscope stands out as an extraordinary instrument that offers unique capabilities not found in other heating microscopes or dilatometers. It enables captivating real-time video investigations, allowing you to observe details at the micron scale across a generous field of view (10mm x 14mm) at impressive data sampling rates of up to 10 points per second. This exceptional feature simplifies the measurement of sintering shrinkage, creep, melting behavior, volumetric changes, and contact angles in real time.

Moreover, this innovative technology extends the application possibilities across a wide temperature range, spanning from -150°C to a remarkable 2000°C, all within a vacuum-tight design with the added capability for gas handling.

Key Advantages of the Heating Microscope:

  1. Non-contact measurement of samples.
  2. Determination of coefficients of thermal expansion (CTE) for solids and volumetric changes in melts.
  3. Versatile, capable of operating in multiple atmospheric conditions.
  4. Exceptional temperature range from -150°C to 2000°C.
  5. Automated evaluation of critical temperature points.
  6. Real-time video and image recording.
  7. Optional optical optimization packages available for CTE and optical microscopy, either separately or combined.

The Linseis DIL L74 HM Heating Microscope redefines the possibilities for materials analysis, offering an unparalleled level of insight and data acquisition for a broad range of applications.


Model DIL L74 HM
Optical measuring system: Heating microscope equipped with a high-resolution camera and fully automated focus
Temperature range: -150°C up to 500°C
RT up to 500/1000/1500/2000°C
Price range: $$
Measuring system: optical non contact
Accuracy: up to 1 µm
Field of view: 10 x 14 mm
Atmosphere: inert, reducing, oxid., vacuum (option)
Vacuum: up to 10E-5 mbar
Heating rate: 0.01 to 100 K/min. (depends on furnace)
Int. Standards: ASTM D1857, CEN/TR 15404,BS 1016:Part 15, CEN/TS 15370-1, DIN 51730, IS 12891, ISO 540, NF M03-048
Morphometrics: Height, Width, Contact angle, Height/Width Ratio, Area, Roundness, More and freely user-selectable also possible
Interface: USB

Fields of Application

Our instrumentation is well-suited for a diverse range of applications, including those conforming to DIN 51730 (1984, 1998) and ISO 540-1995 standards. Here’s a summary of the key features and applications:

  1. Characteristic Temperatures and Sintering Point: Precisely measure and determine the characteristic temperatures, including the start of sintering and the sintering point.
  2. Ash Fusion Microscopy: Conduct comprehensive ash fusion microscopy, offering valuable insights into the behavior of ash at high temperatures.
  3. Observation and Analysis of Sintering Processes: Explore and analyze sintering processes in real time, allowing for a detailed understanding of material transformations.
  4. Contact Angle Determination: Utilize the instrument for accurate contact angle determination, providing essential information on wetting behavior.
  5. Microscopy at High Temperatures and Under Different Atmospheres: Observe and analyze samples at elevated temperatures and within various atmospheric conditions, enabling a wide range of experiments.
  6. Dilatometric Curves: Generate dilatometric curves, including the shape and area, which offer insights into the material’s response to changing temperatures.
  7. Softening and Melting Behavior: Investigate softening, melting, and moistening behavior, facilitating the understanding of material transformation at high temperatures.
  8. Viscosity Curve: Measure and analyze the viscosity curve, helping to characterize the flow behavior of materials as they change with temperature.

This versatile equipment is applicable to an extensive array of materials and substances, including but not limited to coal ashes, bio ashes, slags, ceramics (such as enamel, clay ceramics, dental ceramics), grinding discs, special ceramics, fireproof ceramics, glass, steel, soldering pastes, stainless steel, and fluxing agents. It offers an invaluable resource for research, quality control, and materials analysis across a wide spectrum of industries and materials.

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All LINSEIS thermo-analytical instruments are seamlessly integrated with PC control, running exclusively on Microsoft® Windows® operating systems. The comprehensive software package comprises three essential modules for temperature control, data acquisition, and data evaluation. This user-friendly software has been developed with the input of our specialists and application experts, ensuring ease of use and thorough functionality.

DIL Features:

  • Glass Transition and Softening Point Evaluation: The software includes tools for precise evaluation of glass transition and softening points.
  • Softening Point Detection: Automatic software-controlled system shutdown for softening point detection.
  • Shrinkage or Expansion Curves: Display and analysis of relative and absolute shrinkage or expansion curves.
  • Expansion Coefficient Calculation: Presentation and calculation of technical and physical expansion coefficients.
  • Rate Controlled Sintering (RCS) Software: Specialized software for the evaluation of sintering processes.
  • Semiautomatic Evaluation Functions: Streamlined evaluation functions for efficiency and accuracy.
  • System Correction Features: Incorporates several system correction features to ensure data accuracy.

General Features:

  • Text Editing: Program capabilities for text editing, facilitating customization.
  • Data Security: Ensures data security in case of power failures, preserving measurement integrity.
  • Thermocouple Break Protection: Built-in protection against thermocouple breaks, maintaining measurement reliability.
  • Repetition Measurements: Easily conduct repetition measurements with minimal parameter input.
  • Current Measurement Evaluation: Ability to evaluate the current measurement, aiding in real-time analysis.
  • Curve Comparison: Compare up to 32 curves for in-depth analysis.
  • Storage and Export: Store and export evaluations for convenient data management.
  • Data Export to MS Excel: Seamless data export to Microsoft Excel for further analysis and reporting.
  • Multi-Methods Analysis: Support for multi-method analysis, including DSC, TG, TMA, DIL, and more.
  • Zoom Function: A zoom function to focus on specific aspects of the data.
  • Derivatives: Calculate first and second derivatives for advanced analysis.
  • Programmable Gas Control: Programmable gas control for precise environmental control during measurements.
  • Statistical Evaluation Package: A statistical evaluation package for robust data analysis.
  • Free Scaling: Flexible scaling options for tailored data representation.

This comprehensive software package empowers users to efficiently control, acquire, and evaluate data from LINSEIS thermo-analytical instruments, ensuring accuracy, flexibility, and ease of use in a Windows-based environment.

KRÜSS Advance Software

KRÜSS works with us in the field of drop contour analysis and provides a wide range of measurement methods for a variety of tasks and applications.

Further informations about the software can be found on KRÜSS Advance | Drop Shape


Ash melting microscope

Certainly, here’s a rewritten version of the content to clarify the temperature-related stages:

  1. Softening Temperature: This is the point at which the edges of the sample begin to round off.
  2. Spheric Temperature: At this stage, the sample assumes a round shape where its height matches the size of its baseline.
  3. Half-Sphere Temperature: When the temperature reaches this point, the sample transforms into a half-sphere shape with a height that is half the size of its baseline.
  4. Flow Temperature: The sample is now nearly in a liquid state, with a size equivalent to only one-third of the half-sphere’s point.

Contact angle

Contact angle measurements are conducted as part of drop contour analysis, involving the optical evaluation of the shadow image of the droplet. Furthermore, the precise determination of the temperature-dependent contact angle is achievable using Linseis’ heating microscope.

Damage analysis of a coated quartz disc

Ceramic glaze

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