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 is a highly advanced instrument that offers unique capabilities for real-time video investigations, setting it apart from other heating microscopes and dilatometers. This cutting-edge device allows for the observation of intricate details at the micron scale across a large field of view, measuring approximately 10mm x 14mm, at impressive data sampling rates of up to 10 data points per second. This remarkable capability enables researchers to study phenomena like sintering shrinkage, creep, melting behavior, volumetric changes, and contact angles in real time.

With this instrument, new application areas can be explored across a wide temperature range, spanning from -150 to 2000°C. Its vacuum-tight design, along with gas handling capabilities, ensures versatile and precise experimentation.

The robust software accompanying the instrument offers automatic video and image analysis, streamlining the process of evaluating results. It can even automatically determine critical parameters such as wetting and contact angles, as well as viscosity temperature points. Furthermore, the Linseis DIL L74 HM Heating Microscope complies with important standards, including DIN 51730, ISO 540, and CEN/TS 15404.

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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

  • Measurements according to DIN 51730 (1984, 1998) / ISO 540-1995
  • Characteristic temperatures plus start of sintering/ sintering point
  • Ash fusion microscopy
  • Observation and analysis of sintering processes
  • Contact angle determination
  • Microscopy at high temperatures and under different atmospheres
  • Dilatometric curves (e.g. shape, area)
  • Softening- and melting behavior, moistening behavior
  • Viscosity curve

Suitable for analysis of coal ashes, bio ashes, slags, as well as ceramic, enamel, clay ceramics, dental ceramics, grinding discs, special ceramics, fire proof ceramics, glass, steal, soldering pastes, stainless steel and fluxing agents.



All LINSEIS thermo analytical instruments are PC controlled. The individual software modules exclusively run under Microsoft® Windows® operating systems. The complete software consists of 3 modules: temperature control, data acquisition and data evaluation. The 32 bit software incorporates all essential features for measurement preparation, execution, and evaluation of a Dilatometer measurement. Thanks to our specialists and application experts, LINSEIS was able to develop comprehensive easy to understand user friendly application software.

  • Glass transition and softening point evaluation
  • Softening point detection with automatic software controlled system shut down
  • Display of relative/absolute shrinkage or expansion curves
  • Presentation and calculation of technical / physical expansion coefficient
  • Rate Controlled Sintering (RCS) Software
  • Sinter process evaluation
  • Semiautomatic evaluation functions
  • Several system correction features

Gerneral features

  • Program capable of text editing
  • Data security in case of power failure
  • Thermocouple break protection
  • Repetition measurements with minimum parameter input
  • Evaluation of current measurement
  • Curve comparison up to 32 curves
  • Storage and export of evaluations
  • Export and import of data ASCII
  • Data export to MS Excel
  • Multi-methods analysis (DSC TG, TMA, DIL, etc.)
  • Zoom function
  • 1 and 2 derivation
  • Programmable gas control
  • Statistical evaluation package
  • Free scaling

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

  1. Softening Temperature: At this temperature, the material begins to soften, causing its edges to become rounded.
  2. Spheric Temperature: This temperature marks the point at which the material achieves a spherical shape, with its height matching the size of its baseline.
  3. Half Sphere Temperature: When the material reaches this temperature, it takes on a half-sphere shape, with its height being half the size of its baseline.
  4. Flow Temperature: At this temperature, the material undergoes significant transformation, becoming nearly liquid in nature. It typically has only one-third of the size of the half-sphere point, indicating substantial flow and deformation.

Contact angle

The measurement of contact angles is performed as part of the drop contour analysis, involving the optical assessment of the shadow image of the droplet. Furthermore, the Linseis heating microscope allows for precise determination of the contact angle’s temperature dependency.

Damage analysis of a coated quartz disc

Ceramic glaze

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