Specifications
| Measurand |
| heat flux |
| temperature |
| Outer dimensions foil with guard |
| (25 x 50) x 10⁻³ m |
| Measurement range |
| (-20 to +20) x 10³ W/m² |
| Temperature sensor |
| type T thermocouple, IEC 60584-1:2013 class 2* |
| Thermal spreaders |
| included |
| Rated bending radius |
| ≥ 7.5 x 10⁻³ m |
| Rated load on cable |
| ≤ 1.6 kg |
| Sensor thermal resistance |
| 12 x 10⁻⁴ K/(W/m²) |
| Sensor thickness |
| 0.38 x 10⁻³ m |
| Uncertainty of calibration |
| ± 5 % (k = 2) |
| Sensitivity (nominal) |
| 5 x 10⁻⁶ V/(W/m²) |
| Asymmetry |
| < 2 % |
| Rated operating temperature range |
| : |
| Continuous use** |
| -70 to +250 °C |
| Cable |
| -70 to +250 °C |
| Connection block |
| -70 to +250 °C |
| Label at the end of the cable |
| -40 to +120 °C |
| IP protection class |
| IP67*** |
| Rated operating pressure range |
| up to 25 bar |
| Standard cable length |
| 2 m |
| Options |
| 5 or 10 m cable length; separate cable; without cable**** |
| * |
| temperature measurement uncertainty: ± 2.5 or 0.0075 × T °C. For details, refer to user manual. |
| ** |
| when measuring at temperatures of -160 °C, contact Hukseflux. |
| *** |
| sensor is not suitable for continuous exposure to water. |
| **** |
| sensor foil only (without cable and connection block) may be used in vacuum. |
| Options |
| • with 5 or 10 metres cable length |
| • separate cable in 2, 5 or 10 metres length |
| • sensor foil only, without wiring, without connection block |
| • LI19 hand-held read-out unit / datalogger |
| NOTE: LI19 measures heat flux only |
Heat flux measurement in high temperature environments
FHF06 is a high temperature foil heat flux sensor that can be used for temperatures up to 250 °C. This is made possible by its all-polyimide design, not using any glues. Other members of the FHF family, the FHF05 series range, can be used up to 120 °C maximum, which makes the FHF06 unique. The sensor is thin, flexible and versatile. FHF06 measures heat flux through the object in which it is incorporated or on which it is mounted, in W/m².
The sensor in FHF06 is a thermopile. This thermopile measures the temperature difference across FHF06’s flexible body. A type T thermocouple is integrated as well, to provide a measurement of temperature. 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 these incorporated spreaders, the sensitivity of FHF06 is independent of its environment.
Heat flux sensor with Hioki datalogger
Unique features and benefits
• High temperature resistance up to 250 °C in continuous use
• Flexible (bending radius ≥ 7.5 x 10-³ m)
• Low thermal resistance
• Fast response time
• Integrated T-type thermocouple
• Robustness, including connection block for strain relief
• IP protection class: IP67 (essential for outdoor applications)
• Integrated heat sinks for low dependence on thermal conductivity
• Sensor foil only – can be used in vacuum
Easy to use
The FHF06 is easy to use. It can be connected directly to commonly used data logging systems. The heat flux in W/m² is calculated by dividing the output of the FHF06, a small voltage, by the sensitivity. The sensitivity is given with the FHF06 on its certificate and on the end of the FHF06 cable.
Robust and stable
Equipped with a connection block, which may serve as strain relief, and with potted protective covers on both sides so that moisture does not penetrate, FHF06 has proven to be very robust and stable.
FHF06 calibration is traceable to international standards. The factory calibration method follows the recommended practice of ASTM C1130 - 21.
Working with heat flux sensors
When used under high temperature conditions, the FHF06 sensitivity to heat flux may be different than stated on its certificate. See the user manual for correcting this temperature dependence. For mounting, see our application note how to install a heat flux sensor.
Suitable electronics
The combined measurement of heat flux and temperature offers you a full picture of the thermal behaviour of a system. Heat flux sensor output is a small millivolt signal. Heat flux sensors are often combined with thermocouples. We have several preferred solutions for amplification, data logging and data visualisation. See our application notes on sensor amplification or FHF sensors with Hioki dataloggers.
Suggested use
Typical applications for FHF06:
• monitoring of plastics and composite moulding
• battery research; thermal runoff
• analysis of industrial ovens
Areas of Application
- Building physics / insulation, thermal comfort and energy budget measurement
- Heat flux measurement to validate CFD thermal simulations
- Industrial monitoring and control / heat flux and heat transfer measurement
- Meteorology / surface energy flux measurement
- Scientific research / heat and heat transfer measurement
