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Hukseflux SBG01 Heat Flux Meter

The Hukseflux SBG01 is a water-cooled heat flux sensor. The ISO standards call this a heat flux meter. Its main purpose is the study of reaction to fire and fire resistance, applied for instance in flammability tests and smoke chamber tests. SBG01 measurements are in accordance with various ASTM and ISO standards. SBG01 has been on the market since 2008, and has rapidly become the sensor of choice for fire testing laboratories.

SBG01 serves to measure the heat flux in the range up to 200 kW/m2. Heat flux sensors of this type are originally designed to work in an environment that is dominated by radiation (so above 50 kW/m2). Application in environments with lower irradiance levels and with much convection should be done with care. Working completely passive, using a thermopile sensor, SBG01 generates an output voltage proportional to the incoming flux. The sensor is water cooled. There are 6 types of SBG01; with different working range, sensitivity and response time.

Comparing to traditional Gardon and Schmidt Boelter gauges, SBG01 has several advantages:

  • tubes with increased robustness
  • increased scratch resistance of absorber paint (slightly lowered surface)
  • practical protection cap


Typically cooling water can be supplied from the tap. If it is impractical to use tap water, for passive closed circuit cooling of SBG01, Hukseflux successfully employed the Zalman Reserator (closed circuit water cooling with convective heat exchanger).


Hukseflux provides traceable calibration (our secondary standard is calibrated at the Statens Provningsanstalt (SP), Sweden and by definition is thereby also traceable to NIST). Hukseflux is not a “certified lab”; if required, the user is responsible to maintain certified traceability.

Temperature range cooling water 10 to +30°C
Cooling water flow > 10 litre/hr
preferably 30 litres per hour @ 3 bar (normal tap water)
Working ranges kW/m2 5, 10, 20, 50, 100, 200
Response times:
5 to 10 kW/m2
20 to 50 kW/m2
100 to 200 kW/m2
< 450 ms (63%)
< 250 ms (63%)
< 200 ms (63%)
Maximum range 150% of working range
Output signal > 5 mV at working range
Spectral range to 50.000 nm
Field of view 180°
Emissivity > 0.95
Calibration traceability SP / NIST (not certified)
Calibration status against working standard (ISO 14934)
Standard cable length 2m