Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Instrument Expert
Original factory packaging
Service Hotline：
(+86)010-52867771
Updated:2025-03-13
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User Manual Instructions
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.
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.
1、Low thermal resistance (essential for use on walls and windows)
2、Large guard area (required by the ISO 9869 standard)
3、Low electrical resistance (low pickup of electrical noise)
4、High sensitivity (good signal to noise ratio in low-flux environments such as buildings)
5、Robustness, including a strong cable
6、IP protection class: IP67 (essential for outdoor application)
1、Building heat flux
2、U-value and R-value measurements
3、Soil heat flux
1、Building physics / insulation, thermal comfort and energy budget measurement
2、Geotechnics / soil thermal route analysis
3、Material characterization / thermal conductivity measurement
4、Meteorology / surface energy flux measurement
5、Scientific research / heat and heat transfer measurement
| Measurand | heat flux |
| Measurement range | -2000 to +2000 W/m2 |
| Sensitivity (nominal) | 60 x 10?? V/(W/m2) |
| Sensing area | 8 x 10?? m2 |
| Guard width to thickness ratio | 5 m/m (as required by ISO 9869 D.3.1) |
| Sensor thermal resistance | 71 x 10?? 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 |
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