FHF03

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.

  • Flexible (bending radius ≥ 25 x 10⁻³ m)
  • 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

Description

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 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 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.

Suggested Use

  • General-purpose heat flux measurement

Areas of Application

  • Building physics / insulation, thermal comfort and energy budget measurement
  • Industrial monitoring and control / heat flux and heat transfer measurement
  • Meteorology / surface energy flux measurement
  • Scientific research / heat and heat transfer measurement

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

2m

Options

• With 5 m cable
• LI19 hand-held read-out unit / datalogger

Downloads

Download Product Brochure

Download Product Manual

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