HFP01

Heat Flux Plate

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. If measuring in soil, in case a more accurate measurement is needed the model HFP01SC should be considered.

  • 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)
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Description

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 TRSYS01 is used at multiple locations.

Suggested Use

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

Application of this instrument

How to install a heat flux sensor

Areas of Application
Building physics / insulation, thermal comfort and energy budget measurement
Geotechnics / soil thermal route analysis
Material characterization / thermal conductivity measurement
Meteorology / surface energy flux measurement
Scientific research / heat and heat transfer measurement

Specifications

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

longer cable length (10, 15, 20, 30, 40 m)
• LI19 hand held readout unit

Downloads

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Download Product Manual

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