Specifications
HFP01
| 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 |
Options
Downloads
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The world’s most popular sensor for heat flux measurement
HFP01 measures heat flux through the object in which it is incorporated or on which it is mounted, in W/m². The sensor in HFP01 is a thermopile. This thermopile measures the temperature difference across the ceramics-plastic composite body of HFP01. A thermopile is a passive sensor; it does not require power. Using HFP01 is easy. It can be connected directly to commonly used data logging systems. The heat flux in W/m² is calculated by dividing the HFP01 output, a small voltage, by the sensitivity. The sensitivity is provided with HFP01 on its calibration certificate. A typical measurement location is equipped with 2 or more sensors. HFP01 is the world’s most popular sensor for heat flux measurement in the soil as well as through walls and building envelopes.
Robust and stable
Equipped with heavy-duty cabling, protective covers on both sides and potted so that moisture does not penetrate the sensor, HFP01 has proven to be very robust and stable. It survives longterm installation in soils, as well as repeated installation when a measuring system such as TRSYS20 is used at multiple locations.
BLK and GLD sticker series
Would you like to to study energy transport / heat flux in detail? Hukseflux helps taking your measurement to the next level: order HFP01 with radiation-absorbing black and radiation-reflecting gold stickers. You can then measure convective + 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. Optionally, they can be ordered pre-applied. See the BLK – GLD sticker series user manual and installation video for instructions.
Suggested use
- building heat flux
- U-value and R-value measurements
- soil heat flux
Areas of Application
BLK - GLD sticker
HFP01 heat flux sensor
- low thermal resistance (essential for use on walls and windows)
- large guard area (required by the ISO 9869 standard)
- low electrical resistance (low pickup of electrical noise)
- high sensitivity (good signal to noise ratio in low-flux environments such as buildings)
- robustness, including a strong cable
- IP protection class: IP67 (essential for outdoor application)
