THB – Transient Hot Bridge

Basic, Advance and Ultimate


on the point

This measuring instrument simultaneously delivers the three material properties thermal conductivity, thermal diffusivity and specific heat after just a few minutes, regardless of whether you have placed the corresponding sensors in bulk solids, gels, pastes or plates or immersed them in liquids.

Sample preparation of solids is as simple as it is straightforward. One plane contact surface of each of two sample halves is sufficient for the sensor. Calibration is very simple and does not need to be performed before each measurement.

The THB measures absolute values with an accuracy that does not lag behind conventional plate or LaserFlash devices.

Advantages at a glance:

  • Unsurpassed measurement accuracy for determining thermal conductivity
  • One-button solution:
    • Automated measurement mode
    • No specialist personnel required to operate the instrument
    • No erroneous measurements due to incorrect measurement parameter input
  • Thermal conductivity AND thermal diffusivity
    • Measurement of thermal diffusivity with very low measurement uncertainties
    • Calorimeter function: Calculation of specific heat capacity
  • Measurements within seconds
  • Non-destructive measurements with half-shell sensor
  • Compact dimensions

Complies to the following Norms: ASTM D 5930-01, DIN ISO 22007-2, ASTM D 5334.

PTB Braunschweig/Berlin LogoDeveloped in cooperation with PTB Physikalisch-Technische Bundesanstalt.

Linseis THB Advance

The new THB: small and light, available with transport case

THB Sensor and PMMA

Different sensors for your application

THB – Models: Basic, Advance and Ultimate

THB Basic

  • only compatible with the THB/B sensor and the THB/A sensor
  • THB/B sensor included (THB/A sensor on request)
  • suitable for materials with low thermal conductivity (insulation and building materials)
  • basic installation can be done remotely

THB Advance

  • QSS sensor included (THB/A, THB/B or Hotpoint sensor on request)
  • universal measuring instrument with the widest thermal conductivity range
  • suitable for solids, liquids, pastes and powdery materials
  • suitable for laboratory service providers, institutes and universities
  • basic installation can be done remotely

THB Ultimate

  • including two sensors of your choice
  • high-end instrument for any requirements
  • suitable for almost all materials: from insulators to copper, from solids to liquids and from bulk materials to thin films
  • easy installation and training by qualified personnel


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Model THB Basic THB Advance THB Ultimate
Measuring range:
Thermal conductivity: 0,01 up to 5 W/(mK) 0,005 up to 500 W/(mK) 0,005 up to 1800 W/(mK)
Thermal diffusivity: 0,05 up to 50 mm2/s 0,05 up to 300 mm2/s 0,05 up to 1200 mm2/s
Specific heat capacity: 100 up to 5000 kJ/(m3K) 100 up to 5000 kJ/(m3K) 100 up to 5000 kJ/(m3K)
Measurement precision:
Thermal conductivity**: better than 1 % better than 1 % better than 1 %
Thermal diffusivity**: better than 4 % better than 4 % better than 4 %
Thermal capacity**: better than 4 % better than 4 % better than 4 %
Measuring duration:
Solids: approx. 1 up to 10 min approx. 1 up to 10 min approx. 1 up to 10 min
Liquids: approx. 1 up to 120 s approx. 1 up to 120 s approx. 1 up to 120 s
Operating temperature:
Sensor: –150°C up to 700°C –150°C up to 700°C –150°C up to 700°C
Sensor type: Kapton, Ceramics Kapton, Ceramics Kapton, Ceramics
Sample size:
Smallest sample size*: 1.5 x 1.5 x 2 mm 1.5 x 1.5 x 2 mm 1.5 x 1.5 x 2 mm
Maximum sample size: unlimited unlimited unlimited

* depending on furnace and sensor, sample size depends on material

** depending on sample sensor and sample preparation


Sensor type Min. sample size Temperature range Measuring range Suitable for**** THB Model compatibility
THB Sensors:
THB/A 20 x 40 x 5 mm -150 up to 200 °C*** 0,01 – 5 W/mK S Basic, Advance, Ultimate
THB/A/Metal 20 x 40 x 5 mm -150 up to 200 °C*** 0,01 – 5 W/mK S,P,L Basic, Advance, Ultimate
THB/B 10 x 20 x 3 mm -150 up to 200 °C*** 0,01 – 2 W/mK S Basic, Advance, Ultimate
THB/B/Metal 10 x 20 x 3 mm -150 up to 200 °C*** 0,01 – 2 W/mK S,P,L Basic, Advance, Ultimate
THB/HT** 20 x 40 x 5 mm RT up to 700 °C 0,01 – 1 W/mK S Basic, Advance, Ultimate
QSS 25 x 55 x 3 mm -150 up to 200 °C*** 0,005 – 1800 W/mK S,P Advance, Ultimate
QSS HT** 25 x 55 x 3 mm RT up to 700 °C 0,2 – 100 W/(mK) S,P,L Advance, Ultimate
Hotpoint Sensors:
Hotpoint 1.5 x 1.5 x 2 mm -150 up to 200 °C*** 0,01 – 30 W/mK S,P,L,G Advance, Ultimate
Hotpoint HT** 10 x 10 x 10 mm RT up to 700 °C 0,01 – 5 W/mK P,L,G Advance, Ultimate

* The exact min. sample size depends on the material properties.
** High temperature (HT) version is based on a ceramic substrate, slightly reduces the accuracy.
*** All maximum temperatures refer to operation under air. If Kapton Sensors are used in inert atmosphere the maximum temperature range can be extended from 200°C to 300°C.
**** Solids (S) Liquids (L) Powder (P) Gases (G)

THB A Sensor

THB A Sensor

THB Sensor A Metall

THB A Metal Sensor

THB B Sensor

THB B Metall Sensor

THB B Metal Sensor

THB/HT Sensor

THB/HT Sensor

QSS Sensor

QSS Sensor

QSS HT Sensor

Furnaces and climatic chambers

  • Standard THB furnace – Peltier cooling (-20 to +50 °C)
  • Standard THB furnace HT – with heating cartridges (RT to 200 °C)
  • High temperature furnace (RT to 1000 °C)
  • Low temperature furnace for large samples max. 60 x 100 x 30 mm (-125 to 500 °C)
  • Furnace for controlled humidity (-20 to 80 °C)
  • Furnace for liquids, powders and pastes (150 to 500 °C)

Further accessories

  • Press for defined pressure on the specimen (test stand, handwheel operated up to 500 N, digital force gauge up to 250 )
  • Specimen holder for liquids
  • Specimen holder for powder
  • Transport case for the THB
  • Various calibration materials (PMMA, glass, titanium, tin, zinc)
THB Kalibriermaterial

Calibration materials: PMMA, glass, titanium, tin, zinc

THB Peltieraufsatz

Peltier cooling


Compression press


Making values visible and comparable

THB new software 2021

Advantages at a glance:

  • Advanced THB Windows®-based software interface
  • Provides the fastest measurement times
  • No possibility for application errors thanks to optimized, software-controlled measurement algorithms
  • Enables most accurate and time-saving measurements
  • One-button solution: results at the touch of a button
  • Easy data export to Microsoft Excel®


Application: THB Basic/Advance – Phase change material – Thermal conductivity

App. Nr. 02-006-008 THB Basic Metal B – Phase change material – Thermal conductivity

The example shows the analysis of the thermal conductivity of two hydrated salts. At room temperature both PCMs were liquid. The liquids were filled into a beaker, which was placed in a tempered liquid bath. For the measurement the sensor THB/B/Metal was hung into the sample. The measured temperature steps were -20 °C, -10 °C, 0 °C, +10 °C, 20 °C (room temp.) and +30 °C, thus the measurement was started in the solid state of the material. Three measurement points were recorded at each temperature level and averaged.

The thermal conductivity of Sample A slightly increases with heating up to 0 °C, whereas Sample B shows slightly decreasing values. Both samples change from the solid to the liquid state in the temperature range from 0 °C to 10 °C which can also be clearly seen in the thermal conductivity drop. With increasing temperature, the thermal conductivity of both samples increases slightly. In general, Sample B shows higher thermal conductivities compared to Sample A.

Application: THB Advance – Aluminium Alloy – Thermal conductivity

App. Nr. 02-006-007 THB Basic – Aluminium Alloy – Thermal conductivity

The thermal conductivity of an aluminium alloy was investigated from room temperature to 100 °C using the THB. For the measurement the QSS sensor was placed between two sample pieces and pressed together for an improved thermal contact. The configuration was placed in a furnace and the temperature steps were room temperature, 50 °C and 100 °C. At each step the measurement was repeated three times and the results were averaged. In the diagram one can see that the thermal conductivity is slightly decreasing with temperature. The error bars show an uncertainty of 2 %.




Linseis Product Brochure THB

THB Product Brochure (PDF)