Multi-Purpose Thermal Needle System for Thermal Resistivity / Conductivity Measurement

The MTN02 performs fast measurements of the thermal conductivity and resistivity of soils. Measurement with MTN02 complies with ASTM D5334 and IEEE 442 standards. The system is primarily designed for laboratory (indoor) measurements but can also be used for on-site (field) measurements. MTN02 is operated and powered from the handheld control and readout unit CRU02.

  • Suitable for laboratory and field measurements
  • Suitable for hard soils and concretes
  • Easy data processing
  • Local calibration / conformity assessment


For Laboratory and On-Site
MTN02 is a thermal needle measuring system both for laboratory and on-site measurement of the thermal conductivity of soils. The measurement method is based on the use of a “thermal needle” . This method employs a heating wire and a temperature sensor in a needle.  The MTN02 measuring system consists of the thermal needle, model TP07, mounted on an insertion tool, IT03, and a control and readout unit CRU02. MTN02 is easy to use. The needle is inserted into the soil. The user performs control and readout of the measurement from the handheld CRU02. The measurement result is generated immediately by the CRU02 from the analysis of the time series of the temperature and the heating power during the heating interval.

Suitable for laboratory measurements: MTN02 is primarily designed to perform laboratory measurements. The needle, model TP07, is relatively thin so that common specimens (core samples) may be used. The IT03 can be mounted on a lever that is commonly used in machine shops with which the needle can be vertically inserted into the specimen.

Suitable for (on-site) field measurements: provided that the soil is relatively soft, MTN02 may be used for field measurements.  In case of harder soils or measurements at greater depths we recommend use of stronger needles and a lance (like in the system FTN02), or guiding tubes. MTN02 performs measurements as a stand-alone unit.

Suggested Use

  • Laboratory analysis of soil specimens
  • On-site (field) measurements close to the surface
  • With extension for on-site (field) measurements (see TNS02)

Areas of Application



Temperature, thermal conductivity, thermal resistivity

Measurement range

0.1 to 6 W/(m·K) (all common soils)

Rated operating temperature range

from 0 to +50 °C

Measurement method

absolute measurement per ASTM D 5334-08 and IEEE Standard 442-1981(03)

Data analysis

initial analysis by CRU, final review of measurement on PC (required by ASTM)

Uncertainty (at 20 °C)

+/- (6 % of reading + 0.04) W/(m•K)

Heating interval

300 s (typical)

Data storage capacity

50 measurements

Length TP07


Diameter TP07

3.5 x 10⁻³ m

Data communication



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