Thermal Conductivity & Diffusivity

Heat Flow Meter HFM


The Linseis Heat Flow Meter (HFM) is a thermal conductivity instrument that measures the thermal conductivity of insulating materials. The HFM is designed based on ASTM C518, JIS A1412, ISO 8301 and DIN 12667 standards. The HFM determines the thermal transmittance (U-value) and the thermal conductivity of insulating materials. Compared to other methods such as Guarded Hot Plate (GHP), HFM measurements deliver accurate values for the thermal conductivity much faster.

The Heat Flow Meter is used in the construction industry, equipment manufacturing, or the production of refrigerators, freezers, etc. for testing and quality control of thermal insulation materials.

The HFM is a reliable and easy-to-use instrument that offers a number of technical advantages, including:
  • High precision and accuracy
  • Fast measurement speed
  • Robust design
  • Automated operation
  • Wide temperature range

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Heat Flow Meter HFM

Models HFM 200 HFM 300 HFM 600
Temperature range (plates) 0 to 90°C
-20 up to 90°C
-40 up to 90°C		 0 to 90°C
-20 up to 90°C
-35 up to 90°C		 var. -20 to 70°C
Cooling system External chiller or active refrigerating chiller External chiller or active refrigerating chiller External chiller or active refrigerating chiller
Temperature control (plate) Peltier Peltier Peltier
Measurement data points 99 99 99
Sample size 205 x 205 x 105mm3 305 x 305 x 105mm3 600 x 600 x 200mm3
Thermal resistance measuring range 0.2 to 8.0m2 K/W with Extension* 0.036 to 8.0 m2 K/W 0.2 to 8.0m2 K/W with Extension* 0.036 to 8.0 m2 K/W 0.2 to 8.0m2 K/W with Extension* 0.036 to 8.0 m2 K/W
Thermal conductivity measuring range 0.001 to 2.2 W/m∙K with Extension* 0.036 to 0.8 W/m∙K 0.001 to 0.5 W/m∙K with Extension* 0.001 to 2.5 W/m∙K 0.001 to 0.5 W/m∙K with Extension* 0.001 to 2.5 W/m∙K
Reproducibility 0.25% 0.25% 0.25%
Accuracy +/- 1 to 3% +/- 1 to 3% +/- 1 to 3%
Variable contact pressure 0.25 kPa 0.25 kPa 0.25 kPa

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