Foil heat flux sensor with thermal spreaders, flexible, 50 x 50 mm

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FHF02 is our standard model for general-purpose heat flux measurement. FHF02 is very versatile: it has an integrated temperature sensor and thermal spreaders to reduce thermal conductivity dependence. It is applicable over a temperature range from –40 to +150 °C. FHF02 measures heat flux from conduction, radiation and convection. It is often applied as part of a larger test- or measuring system.


FHF02 is a sensor for general-purpose heat flux measurement. It is thin and versatile. FHF02 measures heat flux through the object in which it is incorporated or on which it is mounted, in W/m2. The sensor in FHF02 is a thermopile. This thermopile measures the temperature difference across the flexible body of FHF02. A type T thermocouple is integrated as well. The thermopile and thermocouple are passive sensors; they do not require power.

A thermal spreader, which is a conductive layer covering the sensor, helps reduce the thermal conductivity dependence of the measurement. With its incorporated spreaders, the sensitivity of FHF02 is independent of its environment. Many competing sensors do not have thermal spreaders. The passive guard area around the sensor redudes edge effects and is used for mounting.

Using FHF02 is easy. It can be connected directly to commonly used data logging systems. The heat flux in W/m2 is calculated by dividing the FHF02 output, a small voltage, by the sensitivity. The sensitivity is provided with FHF02 on its product certificate.

Unique features and benefits

  • flexible (bending radius ≥ 50 x 10-3 m)
  • low thermal resistance
  • wide temperature range  
  • fast response time
  • large guard area
  • integrated type T thermocouple
  • robustness, including wiring with strain relief block
  • IP protection class: IP67 (essential for outdoor application)
  • thermal spreader included, low thermal conductivity dependence

Robust and stable

Equipped with wires with strain relief, protective covers on both sides and potted so that moisture does not penetrate the connection block, FHF02 has proven to be very robust and stable.


FHF02 calibration is traceable to international standards. The factory calibration method follows the recommended practice of ASTM C1130-17.


  • longer wire length
  • LI19 hand-held read-out unit / datalogger

See also

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