HFP01SC Self-Calibrating Heat Flux Sensor
HFP01SC measures soil heat flux in W/m²
HFP01SC measures soil heat flux in W/m². It is used when the highest level of quality assurance and a high measurement accuracy are required. In essence, HFP01SC is a combination of a heat flux sensor and a film heater. The heat flux sensor output is a voltage signal that is proportional heat flux through the sensor. At a regular interval the film heater is activated to perform a self-test. The self-test results in a verification of sensor contact to the soil and in a new sensitivity that is valid for the circumstances at that moment. The latter is called self-calibration. Implicitly also cable connection, data acquisition and data processing are tested. The result is a much improved accuracy & quality assurance of the measurement relative to measurements with conventional sensors such as model HFP01.
Unique features and benefits
- low thermal resistance
- 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)
- robustness, including a strong cable (essential for permanently installed sensors)
- IP protection class: IP67 (essential for outdoor application)
- incorporated film heater for self-testing
Measurement
- heat flux
Measurement range
- -2000 to +2000 W/m²
Sensitivity (nominal)
- 60 x 10⁻⁶ V/(W/m)²
On-line functionality testing
- self-test including self-calibration
Sensing area
- 8 x 10⁻⁴ m²
Sensor thermal resistance
- 81 x 10⁻⁴ K/(W/m²)
Rated operating temperature range
- -30 to +70 °C
IP protection class
- IP67
Film heater resistance
- 100 Ω ± 10 %
Film heater rated power supply
- 9 to 15 VDC
Interval between self-tests
- 6 hr
Heating interval duration
- 180 s
Power consumption daily average
- 0.02 W
Standard cable length
- 2 x 5 m
- longer cable length (2 x 10, 15, 20, 30, 40 m)
![](https://ictinternational.com/wp-content/uploads/2023/04/HFP01SC-soil-heatflux-plate-Self-Calibrating.png)