Posted in | Heat Flux Sensors

Heat Flux Plate - HFP01

The HFP01 heat flux plate is the leading instrument of choice when it comes to measuring heat flux, whether in soil, through walls, or building envelopes. Its ceramics-plastic composite body ensures minimal total thermal resistance, maintaining accuracy.

This heat flux plate boasts exceptional durability and stability, making it suitable for prolonged use in a single location or for repeated installations in systems spanning multiple places. For enhanced precision in soil measurements, the HFP01SC model is recommended.


Source: Hukseflux Thermal Sensors B.V.

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Measurand heat flux
Measurement range -2000 to +2000 W/m²
Sensitivity (nominal) 60 x 10⁻⁶ V/(W/m²)
Sensing area 8 x 10⁻⁴ m²
Guard width-to-thickness ratio 5 m/m (as required by ISO 9869 D.3.1)
Sensor thermal resistance 71 x 10⁻⁴ K/(W/m²)
Sensor thickness 5.4 x 10⁻³ m
Uncertainty of calibration ± 3 % (k = 2)
Rated operating temperature range -30 to +70 °C
Cable diameter 4 x 10⁻³ m
IP protection class IP67
Standard cable length 5 m



  • Longer cable length (10, 15, 20, 30, 40 m)
  • LI19 hand held readout unit
  • BLK-80 black sticker (to measure radiative as well as convective heat flux)
  • GLD-80 gold sticker (to measure convective heat flux only)
  • BLK–GLD sticker series can also be ordered pre-applied at the factory


The World’s Most Popular Sensor for Heat Flux Measurement

The HFP01 heat flux plate measures heat flux in W/m² through the object that it is placed on or integrated into. It uses a thermopile sensor that detects temperature differences across its ceramics-plastic composite body. As a passive sensor, it it does not need external power and can be easily connected to standard datalogging systems.

Heat flux in W/m² is calculated by dividing the small voltage output from HFP01 by its sensitivity, a value specified on the sensor's calibration certificate. Typically, a measurement site utilizes two or more sensors. The HFP01 heat flux plate is widely recognized as the leading choice for measuring heat flux in soil, walls, and building envelopes.

HFP01 – Heat Flux Plate

Image Credit: Hukseflux Thermal Sensors B.V.

A Heat Flux Plate that is Robust and Stable

The HFP01 heat flux plate is designed with sturdy cabling, protective covers on both sides, and moisture-resistant potting, ensuring robustness and stability. It is also able to withstand long-duration installation in soils and can be repeatedly installed when used in systems like TRSYS20 across multiple locations.

HFP01 – Heat Flux Plate

Image Credit: Hukseflux Thermal Sensors B.V.

BLK and GLD Sticker Series

Using the HFP01 heat flux plate with radiation-absorbing black (BLK) and radiation-reflecting gold (GLD) sticker, elevates measurements, taking them to the next level. By using these stickers you can measure convective + radiative flux with one and convective flux with the other. Subtract the two observations to get the radiative flux.

Both BLK and GLD stickers can be applied on the sensor. Optionally, the sensors can be purchased with the stickers pre-applied.

HFP01 – Heat Flux Plate

Image Credit: Hukseflux Thermal Sensors B.V.

What is a heat flux sensor and how does it work

Video Credit: Hukseflux Thermal Sensors B.V.

HFP01 – Heat Flux Plate

Image Credit: Hukseflux Thermal Sensors B.V.


Suggested Use

  • Building heat flux
  • U-value and R-value measurements
  • Soil heat flux

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