HFP01 – Hukseflux Heat Flux Sensor

The HFP01 is the world’s most popular heat flux sensor, used to measure heat flux in soil, building materials, and other objects. This sensor converts thermal energy into electrical voltage using a series of thermocouples housed in a ceramic-plastic body and requires no external power supply. The sensor features a robust design, low intrinsic thermal resistance, and can be connected directly to standard data logging systems or, via an amplifier, to telemetry units.

Heat flux measured in W/m²
Passive thermocouple output—no external power supply required
Low intrinsic thermal resistance – minimal impact on measurements
Robust design suitable for long-term installations
Resistance to moisture and harsh environments (IP67)
High sensitivity and signal stability

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Description

The HFP01 measures heat flux through the material in which it is placed or to which it is attached; this value is expressed in W/m².
The output is a small DC voltage proportional to the heat flux—to calculate the actual value, the resulting voltage must be divided by the sensor’s sensitivity, which is specified in the calibration sheet.
This passive sensor requires no power supply of its own, and its polarity determines the direction of the heat flux.

Applications

Measurement of heat flux in soil and building structures
Assessment of thermal conductivity and thermal properties of structures
Energy and environmental monitoring
Building physics and U-value/R-value measurements
Integration with telemetry and data-logging systems

Technical specifications

Technical Specifications	HFP01
Measurement Principle	Thermocouple heat flux sensor
Measurement Range	–2000 to +2000 W/m²
Nominal Sensitivity	~60 × 10⁻⁶ V/(W/m²)
Thermal resistance	low, per ISO 9869
Operating temperature	–30 °C to +70 °C
Protection	IP67
Standard cable	5 m (longer lengths available upon request)
Output	low DC voltage

Downloads

Price List Datasheet Tep06 Cenik 2026 V101 Datasheet H1 Datasheet Telemetrie