Hukseflux

Thermal Sensors

BLK - GLD STICKER SERIESBlack and gold stickers for measuring convective and radiative heat flux separately
Want to study energy transport / heat flux in detail? Hukseflux helps taking your measurement to the next level.
Simply provide your heat flux sensors with radiation-absorbing black and radiation-reflecting gold stickers.
You can then measure convective + radiative flux with one, and only convective flux with the other. Subtract
the two measurements and you have radiative flux. BLK and GLD stickers are available for sensor models
FHF05 series and HFP01. They are designed to be applied by the user to the sensor; see the user manualand installation video for instructions.

Introduction

Figure 1 BLK – GLD stickers with radiation-absorbing(black) and -reflecting (gold) coatings are available for
FHF05(SC) series and HFP01 heat flux sensors

Heat flux measurement is a powerful tool to gain
insights into processes involving thermal energy.
Heat flux consists of conductive, convective andradiative flux. Measuring heat flux, users may
wish to measure only radiative or only convective
heat flux. This is now possible with the BLK –GLD sticker series, designed to be used with awide range of our market-leading heat fluxsensors. The BLK black absorbing stickers willabsorb all radiation and are sensitive to bothradiative and convective heat flux, while the GLD
gold reflective stickers reflect all radiation andare sensitive to convective heat flux only.
Combining BLK and GLD, applied to two separate
heat flux sensors, will allow for measuring
radiative heat flux:Φradiation + convection = ΦBLK
Φconvection = ΦGLD

Φradiation = ΦBLK − ΦGLD

Unique features and benefitsBLK – GLD sticker series:•••

makes it possible to perform convective andradiative heat flux measurements
available as accessory for FHF05(SC) series
and HFP01 heat flux sensors
designed to be applied by the user

Easy to use

Figure 2 measuring with BLK – GLD stickers; application ofa BLK black sticker and a GLD gold sticker on a FHF-type
sensor for measuring radiative and convective heat flux

BLK – GLD stickers are designed to be applied by
the user, but can optionally also be pre-applied atthe factory. Applying a sticker to a heat fluxsensor does not change the sensitivity of thesensor, so no additional calibration is required.
Using the reliable measurement technology behind
our heat flux sensors, separating convective andradiative heat flux has never been easier.

Copyright by Hukseflux. Version 2203. We reserve the right to change specifications without prior notice
Page 1/2. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com

Hukseflux

Thermal Sensors
Sticker specifications
BLKMeasurand

convective and radiative
heat flux
Spectral range (UV-VIS-NIR-FIR) 250 to > 10000 x 10-9 m
Absorption over range> 95 %
Rated temperature range-40 to +150 °C*- continuous use
Rated temperature range-40 to +260 °C*- short intervals

GLD
Figure 3 example: FHF05-50X50 foil heat flux sensor
without and with BLK-50X50 and GLD-50X50 stickers
applied to it

Measurand
Spectral range (NIR-FIR)
Reflection over range
Spectral range (VIS)
Reflection over range
Solar absorption
Rated temperature range- continuous use
Rated temperature range- short intervals

convective heat flux
700 to > 10000 x 10-9 m> 95 %400 to 700 x 10-9 m> 80 %< 20 %-185 to +150 °C*-185 to +260 °C*

Working with BLK – GLD sticker series
Effect on sensor sensitivity
Application on sensor

negligible
by user or at factory
see user manual andinstruction video

Versions and order codes
BLK-10X10 / GLD-10X10
BLK-15X30 / GLD-15X30
BLK-50X50 / GLD-50X50
BLK-15X85 / GLD-15X85
BLK-85X85 / GLD-85X85
BLK-80 / GLD-80*

for use with FHF05-10X10
for use with FHF05-15X30
for use with FHF05-50X50
for use with FHF05-15X85
for use with HFP05-85X85
for use with HFP01

See also the rated temperature ranges in the sensor user manuals

Options
Figure 4 the working principle of BLK – GLD stickers:sensors equipped with black absorbing stickers will absorb allradiation while gold reflective stickers reflect all radiation.
Both stickers are sensitive to convective heat flux•

pre-applied to the sensor at the factory

See also•••••

instruction video on our YouTube channel
FHF05 series general-purpose heat flux sensor
FHF05SC series self-calibrating heat flux
sensor with integrated heatermodel HFP01 for increased sensitivity
view our complete range of heat flux sensors

About Hukseflux
Hukseflux products and services are offeredworldwide via our office in Delft, the Netherlands
and local distributors.

Figure 5 BLK – GLD sticker series are designed to beeasily applied by the user. Pre-application to the sensor
of your choice at the factory is optional

Interested in this product?
E-mail us at: info@hukseflux.com

Copyright by Hukseflux. Version 2203. We reserve the right to change specifications without prior notice
Page 2/2. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com