Hukseflux

Thermal Sensors

HTR02 series

Heater for verification of performance of FHF-type heat flux sensors
Hukseflux, the world market leader in heat flux sensors, simplifies heat flux sensor performance checks.
HTR02 series is a heater with a cable with 4-wires, a known surface area and electrical resistance. It is used
for functionality checks of heat flux sensors like FHF05 series. Users can now easily and objectively checktheir sensor performance before and after use. HTR02 series is available in two different models: 50X50 and
85X85 mm. Users can use the heaters for all sensor dimensions in FHF05 series. See also model FHF05SC
series heat flux sensor with integrated heater.

Introduction
Measuring heat flux, users may wish to regularly
check their sensor performance. A quick check is
now possible with HTR02 series plus someaccessories that most laboratories will have inhouse. The HTR02 series heaters have a wellcharacterised a traceable surface area andelectrical resistance.
HTR02 series is a foil heater. Either it can beused in combination with foil heat flux sensors
such as FHF05 series for test purposes or as a
general-purpose heater.

Heater with FHF05 series
Heaters of HTR02 series can easily be used withall models of FHF05 series.

Figure 1 Model HTR02-50X50 and HTR02-85X85 heater.

Table 1 FHF05 series in use with HTR02 heaters.
FHF05 MODEL
HTR02 HEATER
FHF05-10X10
HTR02-50X50
FHF05-15X30
HTR02-50X50
FHF05-50X50
HTR02-50X50
FHF05-15X85
HTR02-85X85
FHF05-85X85
HTR02-85X85
To achieve higher measurement performance, it
is recommended to make a guard for models
FHF05-10X10, -15X30 and -15X85. See the usermanual for more information.

Figure 2 HTR02-50X50 heater with model FHF05-15X30
heat flux sensor. HTR02 heater series can easily be usedwith all models of FHF05 series.
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Unique features and benefits
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•

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makes it possible to perform a simple test
guarantees sensor stability
matches all models of FHF05 series heat fluxsensors
HTR02 series heaters have a wellcharacterised and traceable surface area andelectrical resistance
supplied with product certificate stating
surface area in [m²] and heater resistance in[Ω]HTR02 series specifications
Power supply voltage
12 VDC
Effective heater area per model
50X50 2381 x 10-6 m2
85X85 7022 x 10-6 m2
Heater electrical resistance per model
50X50 120 Ω (nominal)
85X85 40 Ω (nominal)
Heater thickness
0.1 x 10-3 m
Outer dimensions foil per model
50X50 (50 x 50) x 10-3 m
85X85 (85 x 85) x 10-3 m
Rated operating temperature range- continuous use-40 to +150 oC
Heater rated power supply
9 to 15 VDCStandard cable length
2 m (2 x 2 wires)
Certificate
supplied with acertificate stating
surface area in [m2]and heater resistance in [Ω]Requirements for testing
metal heat sink > 1 kg;
power supply 12 VDC;
0.2 A;
insulation material;
voltage measurement;
contact material such as
glycerol or toothpaste
Optionswith 5 or 10 m cable
lengthCalibration experiments
In a typical test setup as in figure 3, theheat losses through the insulation areFigure 3 Models FHF05SC 50X50 and 85X85; Y1= 47.6 or 82.6 and Y2 = 48 or 83, dimensions in
× 10-3 m. (1) heater area, (2) passive guard, (3)connection block and (4) cable, standard length C= 2 m.

Options••with 2, 5 or 10 m cable lengthwith a separate cable in 2, 5 or 10 m

See also•••

typically smaller than 3 % and may beignored. Measuring the heater power(voltage Uheater square divided by resistance
Rheater), and dividing by the surface area
Aheater, gives the applied heat flux. The heat
flux sensor sensitivity S is the voltageoutput Usensor divided by the applied heatflux. S = (Usensor∙Rheater∙Aheater)/Uheater²
The reproducibility of this test is much
improved when using contact material
between heater, sensor and heat sink.

FHF05SC series heat flux sensors withintegrated heater
FHF05 series general purpose heat fluxsensors
view our complete range of heat flux sensors

Copyright by Hukseflux. Version 2201. We reserve the right to change specifications without prior notice
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About HuksefluxFigure 4 Working with HTR02 series; a typical stack used
for calibration consists of a block of metal (mass > 1 kg),
for example aluminium (5), the heat flux sensor (3), theHTR02 (2) and an insulation foam (1). Under theseconditions, heat losses though the insulation arenegligible. Heat flux flows from hot to cold. Dimensions inx 10-3 m.

Hukseflux is the leading expert in measurementof energy transfer. We design and manufacture
sensors and measuring systems that support theenergy transition. We are market leaders in solar
radiation- and heat flux measurement.
Customers are served through the main office in
the Netherlands, and locally owned
representations in the USA, Brazil, India, China,Southeast Asia and Japan.

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

Copyright by Hukseflux. Version 2201. We reserve the right to change specifications without prior notice
Page 3/3. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com