Soil Temperature

HFP01SC SELF-CALIBRATING HEAT FLUX SENSORTM

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The HFP01SC self-calibrating heat flux sensortm is
a sensor intended for high accuracy
measurement of soil heat flux. Also it offers
improved quality assurance of the measurement.
The on-line calibration (the Van den BosHoeksema method) automatically corrects for
various common errors, in particular those due to
the non-perfect matching of the thermal
conductivity of sensor and soil, and due to
variations of the thermal conductivity of the soil
caused by varying moisture content.
HFP01SC is a combination of a heat flux sensor
and a film heater. The primary purpose is to
estimate the heat flux through the surrounding
soil. The HFP01SC output is a voltage signal that
is proportional heat flux through the sensor. The
film heater that is mounted on top can be
activated to perform a calibration (see figure 2),
resulting in a new calibration factor that
compensates for the errors made under the
circumstances of that moment. Implicitly also
cable connection, data acquisition and data
processing are tested. Also errors due to
temperature dependence and instability of the
sensor are eliminated. The result is a much
improved accuracy & quality assurance of the
measurement (relative to conventional models
such as model HFP01).
A typical measurement location is equipped with
2 sensors for good spatial averaging.
The product manual can be obtained via e-mail.
Programs for the Campbell Scientific CR10X and
CR1000 are available.

HEAT FLUX SENSOR SPECIFICATIONS
Sensitivity (nominal): 50 µV/ Wm2

Resistance (nominal): 2 Ω
Temperature range: -30 to +70 °C
Expected accuracy: +/- 3%
FILM HEATER SPECIFICATIONS
Resistance (nominal): 100 Ω
Voltage input/output: 9-15 VDC/ 0-2VDC
Duration of calibration: ± 3 min at 1.5
Watt, typically every
3 or 6 hours
Average power consumption: 0.02 or 0.04 Watt

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