Water-Cooled Heat Flux Sensors

Hukseflux offer a range of water cooled industrial heat flux sensors for heat flux and temperature measurements in high temperature industrial environments and fire testing.

• The SBG01 is a water-cooled sensor that measures heat flux for fire and fire resistance.
• The HFS01 is a water-cooled high heat flux sensor for concentrated solar radiation and flames
• The GG01 Gardon Gauge Water-Cooled High Heat Flux Sensor for measurement where radiation is the source of heat flux.

SBG01

The SBG01 is a water-cooled sensor that measures heat flux. The ISO standards call this a heat flux meter. Introduced in 2008, SBG01 has rapidly become the sensor of choice for fire testing. SBG01 is mainly used to test reaction to fire and fire resistance. It is also used as a calibration reference standard for test equipment, for example in flammability and smoke chamber tests. SBG01 complies with the requirements of the most common ASTM and ISO standard test methods.

HFS01

The HFS01 High heat flux sensor for concentrated solar radiation and flames, water cooled is a water-cooled sensor that measures high-level radiative and convective heat fluxes. It is designed for studies of concentrated solar irradiance (800 x concentrated direct solar radiation) and high-intensity flames (gas burners, coal fires). HFS01 has a very robust all-metal / ceramics instrument body and sensor, and is equipped with a high-temperature cable to survive the extreme conditions of a typical experiment.

GG01

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

SBG01

• 6 models of SBG01: SBG01 measures heat flux in the range of (5 to 200) 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, SBG01 is also sensitive to convective heat flux. This contribution is usually ignored. Application in environments with lower than 50 x 10³ W/m² irradiance levels or environments with significant heat transport by convection is possible but requires a careful evaluation of the measurement uncertainty. SBG01’s thermopile sensor generates an output voltage proportional to the incoming irradiance.

HFS01

• The HFS01 High heat flux sensor for concentrated solar radiation and flames, water cooled is a water-cooled sensor that measures high-level radiative and convective heat fluxes. It is designed for studies of concentrated solar irradiance (800 x concentrated direct solar radiation) and high-intensity flames (gas burners, coal fires). HFS01 has a very robust all-metal / ceramics instrument body and sensor, and is equipped with a high-temperature cable to survive the extreme conditions of a typical experiment.
• The HFS01 measures heat flux in the range of (0 to 800) x 10³ W/m²; the extremely high fluxes as generated by flames and solar concentrators. Equipped with a black absorber, the instrument is designed for measurement in an environment in which heat flux includes radiation as well as convection. HFS01’s thermopile sensor generates an output voltage proportional to the total absorbed heat flux. The sensor must be water-cooled, usually by tap water. A removable flange that can be used for mounting is supplied with the sensor. Also, a type K thermocouple is included, to measure the sensor body temperature.
• The part of the cabling closest to the sensor is a special high-temperature metal sheathed cable with an interlocked spiral stainless steel armour. The high-temperature cable and armour withstand temperatures up to 900 °C. Because the sensor body is water cooled, it will remain relatively cool. The surface temperature of the sensor may reach 650 ˚C. The low-temperature extension cable has a jacket of PTFE type plastic.

GG01

• The 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 body is equipped with a flange for easy mounting. The GG01-250 may be equipped with a sapphire window (GG01-250-SW), allowing the user to measure only the radiative component of the heat flux.
• The sensor is water-cooled, usually supplied by tap water. All GG01s are tested to withstand a cooling water operating pressure of 10 bar.
• The GG01 is made using oxygen-free high thermal conductivity copper and thin foils of a copper-nickel alloy. The benefit of this technology is that it can withstand very high heat fluxes.

About the Gardon Gauge from Hukseflux

• • The sensor is called “Gardon gauge” after its inventor Robert Gardon. Hukseflux invested in brand new manufacturing and test equipment for producing modern Gardon gauges. Each sensor is tested at its rated range.

SBG01

• There are 6 models of SBG01; each with a different rated measurement range, calibration reference irradiance level, sensitivity and response time. Water cooling is usually supplied by tap water. There are several optional body designs. The standard body is equipped with a flange. Common options are a smooth cylinder body without a flange (model -C) and threaded body (model –T). Also a thermocouple (type T or K) can be fitted upon request
• Advantages
  • SBG01 has a novel sensor design, which combines the benefits of foil technology of the traditional Gardon gauges with those of the thermopile technology of the traditional Schmidt-Boelter gauges. SBG01 has several advantages:
    • scratch resistant absorber coating (slightly lowered surface)
    • safe storage with a practical protection cap
• Suggested use
  • robust and serviceable water tubes
  • The SBG01 has rapidly become the sensor of choice for fire testing.
    • The SBG01 is mainly used to test reaction to fire and fire resistance.
    • It is also used as a calibration reference standard for test equipment for example in flammability and smoke chamber tests

HFS01

• The HFS01 sensor can also be ordered without black coating, so that HFS01’s absorption of radiation is reduced, while it remains sensitive to convective radiation. Users may also coat HFS01 with their own coating, to create a different response to radiation.
• HFS01 has several advantages:
  • very robust all-metal / ceramics instrument body and sensor
  • high-temperature signal cable
  • signal wires electrically insulated from the sensor body and from cooling water
• Using HFS01 is easy. It can be connected directly to commonly used data logging systems. The heat flux, in W/m², is calculated by dividing the HFS01 output, a small voltage, by the sensitivity. The sensitivity is provided with HFS01 on its product certificate. Equipped with heavy-duty cabling and a fully stainless steel casing which prevents moisture from penetrating the sensor, HFS01 has proven to be very reliable.

GG01

There are 3 versions of GG01; each with a different rated measurement range, sensitivity and response time. Irradiance ranges are 250, 500 or 1000 x 10³ W/m²:

• GG01-250 with an irradiance ranges of 250 x 10³ W/m²,
• GG01-500 with an irradiance ranges of 500 x 10³ W/m²,
• GG01-1000 with an irradiance ranges of 1000 x 10³ W/m²,

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