Gardon Gauge Water-Cooled High Heat Flux Sensor

GG01 is a water-cooled sensor that measures heat flux. The Gardon gauge sensor is based on copper and copper alloys, and works at heat flux levels at which other sensors get toasted. Optionally GG01 can be equipped with a sapphire window; to measure radiative heat flux only, and not convective heat flux. GG01 has an on-board thermocouple type K and is available with various dedicated measurement ranges.

  • Withstands very high heat fluxes
  • Fast response time
  • Equipped with type K thermocouple to measure body temperature
  • Suitable for use in high vacuum
  • Safe storage with a practical protection cap


GG01 measures heat flux in the range of (250 to 1000) x 10³ W/m². Equipped with a black absorber, heat flux sensors of this type are designed for measurement in an environment in which heat flux is dominated by radiation. Using an open detector, GG01 is also sensitive to convective heat flux.

The GG01 Gardon gauge sensor, based on thermocouple materials, generates an output voltage proportional to the incoming irradiance. A type K thermocouple measures the body temperature. The sensor is water-cooled. Water cooling is usually supplied by tap water.

There are 3 versions of GG01; each with a different rated measurement range, sensitivity and response time. Irradiance ranges are (250, 500 and 1000) x 10³ W/m², for GG01-250, GG01-500 and GG01-1000 respectively. The body is equipped with a flange for easy mounting. GG01-250 may be equipped with a sapphire window. See options.

GG01 is made using oxygen-free high thermal conductivity copper and thin foils of a copper-nickel alloy. The sensor is called “Gardon gauge” after its inventor Robert Gardon. The benefit of this technology is that it can withstand very high heat fluxes.

Hukseflux invested in brand new manufacturing and test equipment for producing modern Gardon gauges. Each sensor is tested at its rated range.

All GG01s are tested to withstand a cooling water operating pressure of 10 bar.

Optionally GG01 may be equipped with a sapphire window (GG01-250-SW). It allows the user to measure only the radiative component of the heat flux.


Suggested Use

  • GG01 is the sensor of choice for high heat flux measurements.

Areas of Application

  • Industrial monitoring and control / heat flux and heat transfer measurement
  • Scientific research / heat and heat transfer measurement



heat flux

Measurement range

(250, 500, 1000) x 10³ W/m²

Measurand in SI units

irradiance in W/m²

Sensor technology


Rated cooling water flow (see manual for more information)

> 50 l/h (0.014 l/s)

Nominal response time (63 %) at different rated measurement ranges


250 x 10³ W/m²

250 x 10⁻³ s

500 x 10³ W/m²

200 x 10⁻³ s

20, 50 x 10³ W/m²

200 x 10⁻³ s

1000 x 10³ W/m²

100 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

Full field of view angle

180 °

Calibration traceability

to ITS-90

Calibration laboratory


-management system certification

ISO 9001

- accreditation

not accredited

Calibration method

secondary calibration method according to ISO 14934-3

Standard cable length

2 m (see options)

Order code standard version

GG01/rated measurement range/cable length


Rated measurement range (250, 500, 1000) x 10³ W/m²
Sapphire window (for GG01-250 only)
Longer cable (specify either 5 or 10 m)


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Download Product Manual

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