HFP01SC heat flux sensor

Self-calibrating heat flux sensor

HFP01SC self-calibrating heat flux sensor™ is a heat flux sensor for use in the soil. It offers the best available accuracy and quality assurance of the measurement. The on-line self-test verifies the stable performance and good thermal contact of sensors that are buried and cannot be visually inspected and taken to the laboratory for recalibration. The self-test also includes self-calibration which compensates for measurement errors caused by the thermal conductivity of the surrounding soil (which varies with soil moisture content), for sensor non-stability and for temperature dependence.

Specifications

Measurand

heat flux

Measurement range

-2000 to +2000 W/m²

Sensitivity (nominal)

60 x 10⁻⁶ V/(W/m)²

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Specifications
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Specifications

Measurand

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

Options

longer cable length (2 x 10, 15, 20, 30, 40 m)

Downloads

HFP01SC heat flux sensor brochure

HFP01SC heat flux sensor user manual

Description

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 (see figure 4). 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

Suggested use

high-accuracy scientific measurement of soil heat flux, with a high level of data quality assurance

Areas of Application

Building physics / insulation, thermal comfort and energy budget measurement

Meteorology / surface energy flux measurement

Scientific research / heat and heat transfer measurement

HFP01SC heat flux sensor

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

Would you like a personalised quote?

or contact us: info@hukseflux.com