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 offers fascinating real-time video investigations not available in any other heating microscope / dilatometers. Imagine resolving details down to the micron scale over a large field of view (10mm x 14mm) at data sampling rates of up to 10s points per second. This capability makes it easy to measure sintering shrinkage, creep, melting behavior, volumetric change and contact angles in real time.

New application areas can now be tackled over a broad temperature range (-150 to 2000°C) in a vacuum tight design with gas handling capabilities.

Our robust instrument software allows automatic evaluation of videos and images, including automatic determination of wetting /contact angles and viscosity temperature points.
Compatible with the following standards DIN 51730, ISO 540 or CEN/TS 15404.

The main advantages of the heating microscope are:

  • Contact free measurement of samples
  • CTE of solids and volumetric change of melts
  • Instrument capable of multiple atmospheres.
  • Broad temperature range from -150°C to 2000°C
  • Automatic evaluation of relevant temperature points
  • Video and image recording in real-time
  • Optical optimization packages available for CTE and optical microscope (separate or combined)


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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
– (Unsichtbar, siehe EXTRA CLASS NAME unten) – – (Unsichtbar, siehe EXTRA CLASS NAME unten) – 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.

Linseis Heating Microscope and Optical Dilatometer inside


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

Linseis cooperation with Krüss for contact angle measurements


Ash melting microscope

1 – Softening temperature = edges are getting round, 2 – spheric temperature = round shape of height that is as big as its baseline, 3 – half sphere temperature = half sphere shape of height that is half the size of its baseline, 4 – flow temperature = sample is nearly liquid, hasonly one third of the size of half sphere point

Ash melting microscope

Contact angle

The contact angle measurement takes place within the scope of the drop contour analysis, in which the shadow image of the drop is optically evaluated. In addition, the temperature dependence of the contact angle can be determined exactly with the heating microscope of Linseis.

Determination of contact angle

Damage analysis of a coated quartz disc
Ceramic glaze