Updated:2023-01-14
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Two self-calibrating foil heat flux sensors with thermal spreaders and heater
FHF05SC series are sensors for general-purpose heat flux measurement, combined with a heater. It is used when the highest level of quality assurance is required and for long-term heat flux measurements. It is thin, flexible and versatile. FHF05SC series measures heat flux through the object in which it is incorporated or on which it is mounted, in W/m2. The sensor within is a thermopile. This thermopile measures the temperature difference across FHF05SC’s flexible body. A type T thermocouple is integrated as well to provide a temperature measurement. 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 FHF05SC series is independent of its environment. Many competing sensors do not have thermal spreaders. The passive guard area around the sensor reduces edge effects and is also used for mounting.
1、 heater for self-test
2、flexible (bending radius ≥ 15 x 10⁻³ m)
3、low thermal resistance
4、wide temperature range
5、fast response time
6、integrated type T thermocouple
7、robustness, including potted connection block, may be used as strain relief
8、IP protection class: IP67 (essential for outdoor application)
9、integrated thermal spreaders for low thermal conductivity dependence
1、for heat flux: one millivolt measurement
2、for heater voltage: one voltage measurement
3、optional, for heater current: one current measurement or voltage measurement over a resistor
4、for switching the heater current on and off: one relay with 12 VDC nominal output
Measurand | heat flux, temperature |
Outer dimensions foil with guard | (50 x 50, 85 x 85) x 10⁻³ m |
Measurement Range | (-10 to +10) x 10³ W/m² |
Sensitivity (nominal) | : |
FHF05SC-50X50 | 13 x 10⁻⁶ V/(W/m²) |
FHF05SC-85X85 | 50 x 10⁻⁶ V/(W/m²) |
Temperature sensor | type T thermocouple, IEC 60584-1:2013 class 2* |
Thermal spreaders | Included |
Rated bending radius | ≥ 15 x 10⁻³ m |
Rated load on cable | ≤ 1.6 kg |
Sensor thermal resistance | 24 x 10⁻⁴ K/(W/m²) |
Sensor thickness | 0.7 x 10⁻³ m |
Uncertainty of calibration | ± 5 % (k = 2) |
Rated temperature range – continuous use | -40 to +120 °C** |
Rated temperature range – short intervals | -160 to +150 °C** |
IP protection class | IP67 |
Standard wire length | 2m |
FHF05SC-50X50 | 120 Ω (nominal) |
FHF05SC-85X85 | 40 Ω (nominal) |
Heater power supply | 12 VDC |
Options |
・5 or 10 m cable length, separate cable, BLK black sticker, GLD gold sticker. ・temperature measurement uncertainty: 5 % of value in C. For details, refer to user manual. ・rated operating conditions: 120 ˚C continuous use, 150 ˚C short intervals; use to -80 ˚C is possible. ・sensor is not suitable for continuous exposure to water. ・with 5 or 10 metres cable length. ・separate cable in 2, 5 or 10 metres length. ・LI19 hand-held read-out unit / datalogger NOTE: LI19 measures heat flux only, not temperature, does not support the self-test functionality ・BLK black sticker (to measure radiativeas as well convective heat flux). ・GLD gold sticker (to measure convective heat flux only). ・BLK – GLD sticker series can also be ordered pre-applied at the factory. |
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