Posted in | Heat Flux Sensors

Water-Cooled Heat Flux Sensor - SBG01

The HFP01 heat flux plate is the leading instrument of choice when it comes to measuring heat flux, whether in soil, through walls, or building envelopes. Its ceramics-plastic composite body ensures minimal total thermal resistance, maintaining accuracy.

This heat flux sensor also serves as a calibration reference standard in various test equipment, including flammability and smoke chamber tests. SBG01 aligns with the requirements of the widely recognized ASTM and ISO standard test methods.


Source: Hukseflux Thermal Sensors B.V.

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Measurand heat flux
Measurement range (5, 10, 20, 50, 100, 200) x 10³ W/m²
Measurand (in SI units) irradiance in W/m²
Sensor technology both Gardon and Schmidt-Boelter
Rated cooling water temperature range 10 to +30 °C
Rated cooling water flow > 10 l/h (0.003 l/s) preferably 30 l/h (0.01 l/s)
Rated measurement ranges (5, 10, 20, 50, 100, 200) x 10³ W/m²
Response time (63 %) at different measurement ranges :
5, 10 x 10³ W/m² < 450 x 10⁻³ s
20, 50 x 10³ W/m² < 250 x 10⁻³ s
100, 200 x 10³ W/m² < 200 x 10⁻³ s
Limiting measurement range 150 % of rated measurement range
Output signal DC voltage
Output signal range > 5 x 10⁻³ V at rated measurement range
Spectral range 0 to 50 x 10⁻⁶ m
Full field of view angle 180°
Black coating emissivity > 0.95
Calibration traceability to ITS-90
Calibration laboratory :
-management system certification ISO 9001
-accreditation not accredited
Calibration method SBGC secondary calibration method according to ISO 14934-3
Standard cable length 2 m (see options)
Order code standard version SBG01/rated measurement range/cable length



  • Thermocouple (type T or K) can be fitted upon request
  • Rated measurement range (5, 10, 20, 50, 100, 200) × 10³ W/m²
  • Longer cable (5 m, 10 m and 20 m)
  • Smooth cylindrical body without flange (model SBG03)
  • For more options, see the user manual


There are 6 Models of the SBG01 Heat Flux Sensor

The SBG01 heat flux sensor measures heat flux within the range of (5 to 200) x 10³ W/m². These heat flux sensors, equipped with a black absorber, have been specifically crafted for environments where radiation primarily influences heat flux.

Despite primarily detecting radiation, SBG01 also captures convective heat flux using an open detector, although this component is often overlooked. While it is feasible to use SBG01 in environments with irradiance levels lower than 50 x 10³ W/m² or where convection plays a significant role in heat transport, a careful evaluation of measurement uncertainty is necessary.

SBG01 – Water-Cooled Heat Flux Meter

Image Credit: Hukseflux Thermal Sensors B.V.

SBG01 features a water-cooled thermopile sensor that generates an output voltage proportional to incoming irradiance. There are six models available, each with varying measurement ranges, calibration reference irradiance levels, sensitivity, and response times.

Water cooling is typically facilitated by tap water. SBG01 offers several optional body designs; the standard configuration includes a smooth cylindrical body with a flange. Alternatively, a smooth cylinder body without a flange (model SBG01) is a common choice. A thermocouple (type T or K) can also be added upon request.

Advantages of this Water-Cooled Heat Flux Sensor

SBG01 features an innovative sensor design that merges the advantages of traditional Gardon gauges' foil technology with the thermopile technology of traditional Schmidt-Boelter gauges. This unique combination provides SBG01 with several distinct benefits:

  • Robust and serviceable water tubes
  • Scratch-resistant absorber coating (slightly lowered surface)
  • Safe storage with a practical protection cap

SBG01 – Water-Cooled Heat Flux Meter

Image Credit: Hukseflux Thermal Sensors B.V.

Suggested Use

The SBG01 water-cooled heat flux sensor has quickly become the preferred sensor for fire testing, primarily utilized for evaluating reactions to fire and fire resistance. Additionally, it serves as a vital calibration reference standard in various test equipment, including flammability and smoke chamber tests.

Other Equipment by this Supplier

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