FHF03 heat flux sensor

Economical foil heat flux sensor with thermal spreaders, thin, versatile and small

FHF03 heat flux sensor packs a lot of qualities at low cost in its flexible foil body

The versatile FHF03 being installed on a PC processor for heat flux and temperature measurement

Economical foil heat flux sensor with thermal spreaders, flexible, small

FHF03 is a general-purpose heat flux sensor. Looking for a relatively small sensor with the best price-performance ratio, this should be your first choice. FHF03 is very versatile: it has an integrated temperature sensor and thermal spreaders to reduce thermal conductivity dependence. It is applicable over a temperature range from –40 to +150 °C. FHF03 is designed for robustness with durable wire connections and cabling. Qualities like these are unmatched at this price level.

Specifications

Measurand

heat flux
temperature

Measurement range

(-10 to +10) x 10³ W/m²

Sensitivity (nominal)

2 x 10⁻⁶ V/(W/m²)

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Specifications
Description
Services & Support
Applications
FAQ
Accessories

Specifications

Measurand

heat flux
temperature

Measurement range

(-10 to +10) x 10³ W/m²

Sensitivity (nominal)

2 x 10⁻⁶ V/(W/m²)

Temperature sensor

type T thermocouple

Thermal spreaders

included

Rated bending radius

≥ 25 x 10⁻³ m (repeated bending not recommended)

Rated load cable

≤ 10 kg

Outer dimensions foil with guard

(31 x 14.5) x 10⁻³ m

Sensing area

2.5 x 10⁻⁴ m²

Sensor thermal resistance

28 x 10⁻⁴ K/(W/m²)

Sensor resistance range

20 to 30 Ω

Sensor thickness

0.8 x 10⁻³ m

Uncertainty of calibration

± 5 % (k = 2)

Operating temperature

-40 to +150 °C range

IP protection class

IP67

Standard cable length

Options

with 5 m cable, with BLK-3015 sticker, with GLD-3015 sticker

Options

with 5 metres of cable
LI19 hand-held read-out unit / datalogger
BLK-3015 black sticker (to measure radiative as well as convective heat flux)
GLD-3015 gold sticker (to measure convective heat flux only)
BLK - GLD sticker series can also be ordered pre-applied at the factory

Downloads

FHF03 heat flux sensor user manual

Description

Flexible FHF03 foil heat flux sensor for heat flux measurement on curved surfaces

FHF03 is an economical sensor for general-purpose heat flux measurement. It is small, thin and versatile. FHF03 measures heat flux through the object in which it is incorporated or on which it is mounted, in W/m². The sensor in FHF03 is a thermopile. This thermopile measures the temperature difference across FHF03’s flexible body.

A type T thermocouple is integrated as well. The thermopile and thermocouple are passive sensors; they do not require power. A thermal spreader, which is a conductive layer covering the sensor, helps reduce the thermal conductivity dependence of the measurement. With its incorporated spreaders, the sensitivity of FHF03 is independent of its environment. Many competing sensors do not have thermal spreaders. Equipped with well-protected wire connections and a sturdy, shielded cable, FHF03 is designed for robustness. Qualities like these are unmatched at this price level.

FHF03 foil heat flux sensor is engineered for a long lifetime

FHF03 offers unique features and benefits:

flexible (bending radius ≥ 25 x 10⁻³ m)
low thermal resistance
wide temperature range
fast response time
integrated type T thermocouple
robust: well-protected wire connections and a sturdy, shielded cable
IP protection class: IP67 (essential for outdoor application)
thermal spreader included, low thermal conductivity dependence

FHF03 foil heat flux sensor: thin, small, flexible and very versatile

FHF03 calibration is traceable to international standards. The factory calibration method follows the recommended practice of ASTM C1130-17. When used under conditions that differ from the calibration reference conditions, the FHF03 sensitivity to heat flux may be different than stated on its certificate. See the user manual for suggested solutions.

Using FHF03 is easy. It can be connected directly to commonly used data logging systems. The heat flux in W/m² is calculated by dividing the FHF03 output, a small voltage, by the sensitivity. The sensitivity is provided with FHF03 on its product certificate. For increased sensitivity, robustness and a larger sensing area, consider using model FHF02 and, in particular for building physics and soil heat flux, model HFP01, the world’s most popular heat flux sensor.

Would you like to to study energy transport / heat flux in detail? Hukseflux helps taking your measurement to the next level: order FHF03 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.