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.