The HFP01 uses a thermopile to measure temperature gradients across its plate. Operating in a completely passive way, it generates a small output voltage that is proportional to this differential temperature. Assuming that the heat flux is steady, that the thermal conductivity of the body is constant, and that the sensor has negligible influence on the thermal flow pattern, the signal of the HFP01 is directly proportional to the local heat flux.
The HFP01’s output is in millivolts. To convert this measured voltage to heat flux, it must be divided by the plate’s calibration constant. A unique calibration constant is supplied with each sensor.
Specifications
| Parameter | Specification |
|---|---|
| Sensor Type | Thermopile |
| Sensitivity | 50 μV W⁻¹ m⁻² (nominal) |
| Nominal Resistance | 2 Ω |
| Temperature Range | −30°C to +70°C |
| Sensor Thermal Resistance | < 6.25 × 10⁻³ K·m²·W⁻¹ |
| Measurement Range | ±2000 W·m⁻² |
| Accuracy | Within −15% to +5% in most common soils (12-hour totals) |
| Plate Diameter | 80 mm (3.15 in.) |
| Plate Thickness | 5 mm (0.20 in.) |
| Weight | 200 g (7.05 oz) without cable |
| Product | Soil Heat Flux Plate (HFP01-L) |
Agricultural Monitoring
Meteorological Research
Environmental Studies
Greenhouse Research
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