FHF05 Flexible Foil Heat Flux Sensors with Thermal Spreaders and Temperature Sensor

The FHF05 Foil heat flux sensors with thermal spreaders, flexible, different dimensions, with temperature sensor is the product range to start looking if you consider measuring heat flux. Models are available in five different dimensions and sensitivities. All FHF05’s are flexible, have an integrated temperature sensor and have thermal spreaders to reduce thermal conductivity dependence. Rated temperature range is from –70 to +120 °C. FHF05 measures heat flux from conduction, radiation and convection. Optionally, black (BLK) and gold (GLD) stickers are available for all five models to separately determine heat transport by radiation and convection.

• FHF05-10X10 1 x 10⁻⁶ V/(W/m²)
• FHF05-15X30 3 x 10⁻⁶ V/(W/m²)
• FHF05-50X50 13 x 10⁻⁶ V/(W/m²)
• FHF05-15X85 7 x 10⁻⁶ V/(W/m²)
• FHF05-85X85 50 x 10⁻⁶ V/(W/m²)

Heat flux sensors that cover most heat flux measurement applications

Sensors of the FHF05 series are suitable for general-purpose heat flux measurement. The range is available in five different dimensions. Larger dimensions mean a higher sensitivity and a larger area over which the heat flux is averaged. They are thin, flexible and versatile. FHF05 measures heat flux through the object in which it is incorporated or on which it is mounted, in W/m2. The sensor in FHF05 is a thermopile. This thermopile measures the temperature difference across FHF05’s flexible body. A type T thermocouple is integrated as well. The thermopile and thermocouple are passive sensors; they do not require power. Multiple small thermal spreaders, which form a conductive layer covering the sensor, help reduce the thermal conductivity dependence of the measurement. With its incorporated spreaders, the sensitivity of FHF05 is independent of its environment. Many competing sensors do not have thermal spreaders. The passive guard area around the sensor reduces measurement errors due to edge effects and is also used for mounting.

Unique features and benefits:

• flexible (bending radius ≥ 7.5 x 10⁻³ m)
• low thermal resistance
• wide temperature range
• fast response time
• large guard area
• integrated type T thermocouple
• robustness, including connection block, for strain relief
• IP protection class: IP67 (essential for outdoor application)
• integrated thermal spreaders for low thermal conductivity dependence

Easy to use

Using the FHF05 is easy. It can be connected directly to commonly used data logging systems. The heat flux in W/m2 is calculated by dividing the FHF05 output, a small voltage, by the sensitivity. The sensitivity is provided with FHF05 on its certificate.

Heat flux sensors that are robust and stable

Equipped with a connection block, which may serve as strain relief, and with potted protective covers on both sides so that moisture does not penetrate, FHF05 has proven to be very robust and stable.
FHF05 calibration is traceable to international standards. The factory calibration method follows the recommended practice of ASTM C1130 – 21.

BLK and GLD sticker series

When the FHF05 is specified with radiation-absorbing black and radiation-reflecting gold stickers it is then possible to measure convective and radiative flux with one, and convective flux only with the other. Subtract the 2 measurements and you have radiative flux. BLK – GLD stickers can be applied by the user to the sensor. There are stickers for every sensor dimension. Optionally, they can be ordered pre-applied. See the BLK – GLD sticker series user manual and installation video for instructi

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