Thermtest - Model HFM-25 -Heat Flow Meter

• Insulation samples as small as 50 x 50 x 2 mm and thickness up to 25.4 mm
• Large samples can also be loaded for multiple location testing
• Follows international standards: *ASTM C518, ISO 8301, JIS A1412, and EN 12667

The economic HFM-25 was designed to meet the growing need for steady-state testing of small samples of insulation for true thermal resistance and thermal conductivity.

Designed with simplicity in mind, a sample is positioned between the two heating – cooling plates. Plate contact is controlled manually, with variable pressure applied with the use of standard weights. Thickness is conveniently reported with included digital gauge. Testing on compressible samples is possible with included shims.

Ambient room temperature is automatically detected, users can choose from 5, 10, 15, and 20 °C delta ranges. One heat flux sensor is integrated into each plate and is used to monitor heat flux (Q/A), generated due to the difference in temperature (ΔT) between the top and bottom plate at regular intervals until steady-state heat flux is observed. The composite heat flux is then used to measure thermal resistance (R) and calculate thermal conductivity (λ) according to Fourier’s Law.