Heat Flux Plate Sensors

The Hukseflux Heat Flux Plates are available in three versions for use in any application where heat flux may be a required measurement.

• HFP01 Heat Flux Plate Sensors
• HFP01SC Self-Calibrating Heat Flux Sensor
• HFP03 Ultra-Sensitive Heat Flux Plate

Ideal for the measurement of heat flux in soils, the Heat Flux Plates are also used for building measurements.

HFP01

The HFP01 Heat flux plate is the world’s most popular sensor for heat flux measurement in the soil as well as through walls and building envelopes. The total thermal resistance is kept small by using a ceramics-plastic composite body. The sensor is very robust and stable. It is suitable for long term use on one location as well as repeated installation when a measuring system is used at multiple locations. If measuring in soil, in case a more accurate measurement is needed the model HFP01SC should be considered.

HFP01SC

The 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.

• 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

HFP03

The HFP03 is an Ultra sensitive heat flux plate for measurement of small heat fluxes in the soil as well as through walls and building envelopes. The total thermal resistance is kept small by using a ceramics-plastic composite body. Putting several HFP01 sensors electrically in series is an alternative for using HFP03.

HFP01

The 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.

HFP01SC

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.

HFP03

The HFP03 measures heat flux through the object in which it is incorporated or on which it is mounted, in W/m². THe HFP03 is specifically suitable for measurement of small flux levels, in the order of less than 1 W/m², for instance in geothermal applications. The sensor in HFP03 is a thermopile. This thermopile measures the temperature difference across the ceramics-plastic composite body of HFP03. A thermopile is a passive sensor; it does not require power. Using HFP03 is easy. It can be connected directly to commonly used data logging systems. The heat flux in W/m² is calculated by dividing the HFP03 output, a small voltage, by the sensitivity. The sensitivity is provided with HFP03 on its calibration certificate.

Suggested uses include measuring:

• extremely small heat fluxes
• geothermal heat flux

BLK and GLD sticker series

Would you like to to study energy transport / heat flux in detail? Hukseflux helps taking your measurement to the next level: order HFP01 with radiation-absorbing black and radiation-reflecting gold stickers. You can then measure convective + radiative flux with one, and convective flux only with the other. Subtract the 2 measurements and you have radiative flux. BLK – GLD stickers can be applied by the user to the sensor. Optionally, they can be ordered pre-applied. See the BLK – GLD sticker series user manual and installation video for instructions.

Options

• longer cable length (10, 15, 20, 30, 40 m)
• BLK-80 black sticker (to measure radiative as well as convective heat flux)
• GLD-80 gold sticker (to measure convective heat flux only)
• BLK – GLD sticker series can also be ordered pre-applied at the factory
• LI19 hand held readout unit

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