Sensors of the FHF05 series are suitable for general-purpose heat flux measurement. The range is available in five different dimensions. Larger dimensions mean a higher sensitivity and a larger area over which the heat flux is averaged. They are thin, flexible and versatile. FHF05 measures heat flux through the object in which it is incorporated or on which it is mounted, in W/m2. The sensor in FHF05 is a thermopile. This thermopile measures the temperature difference across FHF05’s flexible body. A type T thermocouple is integrated as well. The thermopile and thermocouple are passive sensors; they do not require power.

Multiple small thermal spreaders, which form a conductive layer covering the sensor, help reduce the thermal conductivity dependence of the measurement. With its incorporated spreaders, the sensitivity of FHF05 is independent of its environment. Many competing sensors do not have thermal spreaders. The passive guard area around the sensor reduces measurement errors due to edge effects and is also used for mounting.

Features:

flexible (bending radius ≥ 7.5 x 10⁻³ m)
low thermal resistance
wide temperature range
fast response time
large guard area
integrated type T thermocouple
robustness, including connection block, for strain relief
IP protection class: IP67 (essential for outdoor application)
integrated thermal spreaders for low thermal conductivity dependence

Specifications:

Measurand: heat flux, temperature
Outer dimensions foil with guard: (10 x 10, 15 x 30, 50 x 50, 15 x 85, 85 x 85) x 10⁻³ m
Measurement range: (-10 to 10) x 10³ W/m²
Sensitivity (nominal): 13 x 10⁻⁶ V/(W/m²)
Temperature sensor: type T thermocouple. Temperature measurement uncertainty: 2 % of value in ˚C
Thermal spreaders: included
Rated bending radius: ≥ 7.5 x 10⁻³ m
Rated load on cable: ≤ 1.6 kg
Sensor thermal resistance: 11 x 10⁻⁴ K/(W/m²)
Sensor thickness: 0.4 x 10⁻³ m
Uncertainty of calibration: ± 5 % (k = 2)
Rated temperature range - continuous use: -70 to 120 °C
Rated temperature range - short intervals: -160 to 150 °C
IP protection class: IP67. Sensor is not suitable for continuous exposure to water
Standard wire length: 2 m