Robust heat flux sensor HFP01

calibration

Overview
The HFP01 is the world’s most popular sensor for heat flux measurement in the soil as well as through walls and building envelopes. The total thermal resistance is kept small by using a ceramics-plastic composite body. The sensor is very robust and stable. It is suitable for long term use on one location as well as repeated installation when a measuring system is used at multiple locations

Key features
• High sensitivity for accurate measurements, even in low heat flux environments.
• Low thermal resistance minimizes disturbance of the measured heat flow.
• Large guard area compliant with ISO 9869 recommendations for building thermal performance measurements.
• Passive thermopile sensor requiring no external power.
• Low electrical resistance reduces susceptibility to electrical noise.
• Suitable for both soil heat flux and building envelope measurements.
• IP67-rated construction for reliable outdoor operation.
• Calibration traceable to international standards.

Applications
• Building heat flux measurements
• U-value and R-value measurements of walls, roofs, and floors
• Soil heat flux measurements
• Separation of radiative and convective heat transfer using optional BLK and GLD stickers.

Specifications
• Measurand: heat flux [W/m²]
• Sensing area: 8 x 10⁻⁴ m²
• Guard width to thickness ratio: 5 m/m
• Measurement range: -2000 to +2000 W/m²
• Sensor thickness: 5.4 × 10⁻³ m
• Thermal resistance: 71 × 10⁻⁴ K/(W/m²)
• Sensor resistance range: 1 to 4 Ω
• Rated operating temperature: -30 °C to +70 °C
• Calibration uncertainty: ±3% (k = 2)

Cable length options
• 5 m
• 10 m
• 15 m
• 20 m
• 30 m
• 40 m