Hukseflux FHF05-50X50 Heat Flux Data Logger Selection User Manual

: June 1, 2024
: Hukseflux

Table of Contents

FHF05-50X50 Heat Flux Data Logger Selection
Specifications:
Product Usage Instructions:
Introduction:
Calculating Heat Flux:
Optimizing System Design:
Suggested Use:
- FAQ:
Q: How do I estimate the output range of the heat flux
Q: What are some common examples of suitable data loggers and

FHF05-50X50 Heat Flux Data Logger Selection

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Specifications:

Manufacturer: Hukseflux
Product: Thermal Sensors
Power Requirement: Passive sensors, do not require power
Output: Voltage
Measurement: Heat flux in W/m2

Product Usage Instructions:

Introduction:

Hukseflux offers a wide range of sensors for heat flux and
temperature measurement. The thermopile heat flux sensor and
thermocouple temperature sensor are both passive sensors; they do
not require power. These sensors can be connected directly to data
loggers and amplifiers.

Calculating Heat Flux:

The heat flux in W/m2 is calculated by dividing the heat flux
sensor’s output (a small voltage) by its sensitivity. The
sensitivity is provided with the sensor on its certificate and can
be programmed into the data logger.

Optimizing System Design:

Selecting the right electronics-sensor combination helps reduce
total system costs. Follow the steps provided in the manual to
optimize your system design and reduce costs.

Suggested Use:

Heat flux + temperature sensors and loggers are used to analyze
temperature changes and validate mathematical CFD simulations.

FAQ:

Q: How do I estimate the output range of the heat flux

sensor?

A: Estimate the output range in [x 10-6 V] using Table 1 in the
manual. Microvolt output range = heat flux range in [W/m2] x
sensitivity in [x 10-6 V/(W/m2)].

Q: What are some common examples of suitable data loggers and

amplifiers for Hukseflux sensors?

A: Common examples include Hioki LR8450, Hioki LR8515, Campbell
CR1000X, and dataTaker loggers, as mentioned in the manual.

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Hukseflux
Thermal Sensors
Heat flux data logger selection guide
Suitable data loggers and amplifiers to work with Hukseflux heat flux sensors
The combined measurement of heat flux and temperature offers you a full picture of the thermal behaviour of a system. Heat flux sensor output is a small millivolt signal. Often heat flux sensors are combined with thermocouples. We have several preferred solutions for amplification, data logging and data visualisation. This brochure shows a summary only, and does not show all sensor models and options. Also not all relevant electronics specifications are shown. Contact Hukseflux for a final check of your proposed solution.

Introduction
Hukseflux offers a wide range of sensors for heat flux and temperature measurement. The thermopile heat flux sensor and thermocouple temperature sensor are both passive sensors; they do not require power. Such sensors can be connected directly to data loggers and amplifiers. The heat flux in W/m2 is calculated by dividing the heat flux sensor’s output, a small voltage, by its sensitivity. The sensitivity is provided with the sensor on its certificate and can be programmed into the data logger.

Figure 1 FHF05-50X50 foil heat flux sensor with thermal spreaders: thin, flexible and versatile.

Optimise system design / reduce cost
The following text helps you to select the right electronics for your application. Selecting the right electronics – sensor combination helps reducing total system costs.
Step 1
Visit the Hukseflux YouTube channel: · quick intro to heat flux (3 min); · online course (40 min); · separating radiation and convection (2 min); · latest heat flux technology (2 min).

Step 2
Specify your measurement: · describe the purpose of the experiment; · estimate the heat flux levels in W/m2; · estimate the temperature levels in °C; · select a suitable sensor:
most common examples are in Table 1.

Figure 2 Hioki LR8450: can handle up to 120 heat flux sensors each with its own temperature measurement and display the measurement results simultaneously on screen.

Step 3
Estimate the output range of the heat flux sensor in [x 10-6 V] using Table 1:
Microvolt output range = heat flux range in [W/m2] x sensitivity in [x 10-6 V/(W/m2)].

Copyright by Hukseflux. Version 2404. We reserve the right to change specifications without prior notice Page 1/5. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com

Hukseflux
Thermal Sensors
Step 4
Specify your electronics and sensors: · look up the brand and model of data logger
you have or want to use; · estimate the number of heat flux – and
temperature channels you need.
Step 5
Ask Hukseflux: · send all information and specifications to
Hukseflux, and ask for our input / suggestions.

Suggested use
Heat flux + temperature sensors and loggers are used to analyse the causes of temperature change. Also, they are used to validate mathematical CFD simulations.

Figure 5 Campbell CR1000X: 8 differential sensor inputs, heat flux and thermocouples, Micro USB B connection, ethernet, MicroSD data storage expansion.

Figure 3 Hioki LR8515 can transmit measurements of 1 sensor and 1 thermocouple via Bluetooth.
Heat flux sensors and the Hioki loggers
Working with sensors and the logger is convenient. See the application notes for the Hioki LR8432, LR8515 and LR8450. See the user manual for suggested solutions. See also our application note on how to install a heat flux sensor. Read more about Hioki data logger LR8450 and FHF05 series in Battery EV Thermal Management.

Figure 6 dataTaker: up to 15 sensor inputs, heat flux and thermocouples, USB memory for easy data and program transfers.
About Hukseflux
Hukseflux is the leading expert in measurements of energy transfer. We design and manufacture sensors and measuring systems that support the energy 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 representative sales offices in the USA, Brazil, India, China, Southeast Asia and Japan.

Interested in our products? E-mail us at: info@hukseflux.com
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Figure 4 PR electronics PR6331B programmable transmitter, can be mounted vertically or horizontally on a DIN rail. Copyright by Hukseflux. Version 2404. We reserve the right to change specifications without prior notice Page 2/4. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com

Hukseflux
Thermal Sensors

Table 1 Examples of different Hukseflux heat flux sensors, their application, sensitivity, temperature sensors and rated operating ranges for temperature and heat flux. This table shows a summary only and does not show all sensor models, options and specifications. Contact Hukseflux for a final check of your proposed solution.

SENSOR [model] FHF05-10X10 FHF05-15X30 FHF05-50X50
FHF05-15X85 FHF05-85X85
FHF06-25X50 IHF01 IHF02 HFP01 HFP03 SBG01-20 SBG01-100 GG01-250 GG01-1000

APPLICATION
[description] high power microchips, flexible high heat flux in ovens, flexible general purpose heat flux, battery thermal management, flexible vrapped around a pipe, flexible low fluxes, insulation performance testing, low accuracy datalogger and amplifiers, flexible heat flux in high temperature environments high temperature / high heat flux, industrial high temperature / low heat flux, industrial very low heat fluxes, buildings, soil extremely low heat fluxes low level fire and flame fire and flame high intensity flame concentrated solar, plasma, rockets, hypersonic wind

RATED T RANGE [°C] -40 to +150 -40 to +150 -40 to +150
-40 to +150 -40 to +150
-70 to +250 -30 to 900 -30 to 900 -30 to +70 -30 to +70 water-cooled water-cooled water-cooled water-cooled

THERMOCOUPLE
[type] T

SENSITIVITY HEAT FLUX [x 106 V/(W/m2)] 1

T

3

T

13

T

7

T

50

T

5

K

0.009

K

0.25

N/A

60

N/A

500

N/A

0.30

N/A

0.15

K

0.024

K

0.008

RATED HF RANGE** [± W/m2] 10 000 10 000 10 000
10 000 10 000
20 000 1 000 000 100 000 2 000 2 000 20 000 100 000 250 000 1 000 000

OPTIONAL RADIATIVE/ CONVECTIVE [y/n] Y (stickers) Y (stickers) Y (stickers)
Y (stickers) Y (stickers)
Y (coating) Y (coating) Y (coating) Y (stickers) N N N Y (sapphire window) N

For water-cooled sensor the temperature of surrounding gasses are typically in the range up to 1500 °C. ** See the manual for details on the rated heat flux ranges; these may depend on the temperature of the sensor or the heat sink that the sensor is mounted on.

Copyright by Hukseflux. Version 2404. Page 3/5. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com

Hukseflux
Thermal Sensors

Table 2 Examples of different electronics compatible with Hukseflux heat flux sensors. This brochure shows a summary only and does not show all relevant electronics specifications. Contact Hukseflux for a final check of your proposed solution.

BRAND

MODEL

OUTPUT

[name] Campbell Scientific [model name] [signal / protocol]

CR1000X

Ethernet Modbus stored data via USB

Keysight Hioki

DAQ970A + multiplexer LR8515

Hioki

LR8432

Hioki

LR8450 LR8450-1

PRElectronics PRElectronics dataTaker

5331A transmitter 6331B transmitter DT80

National

PXI series

Instruments 4065, 4070

Digital to PC, USB, LAN or GPIB Bluetooth to PC
LCD screen, memory card LCD screen, memory card
4-20 mA
2 x (4-20 mA)
Ethernet Modbus USB version available

INPUT
[# of channels, type] 8 (HF + T)
14 (HF + T) 2 (1 x HF, 1 x T) 10 (HF + T) 120 (HF + T)
1 (HF or T) 2 (HF or T) 5 (HF or T) 1 (HF or T)

PRICE LEVEL
[approximate EUR/unit] 2500

VOLTAGE MEASUREMENT ACCURACY* [x 106 V] 0.2

2000

0.1

500

10

1200

0.1

2100, main 0.1 unit

200

10

500

10

2000

0.2

1500

10

COMMENTS
[comments] Optional outdoor and battery powered use. Specs valid from 40 to + 70 °C. Channel extension with multiplexer Laboratory use, channel extension with multiplexer 2 channel standalone use battery powered Laboratory use, immediate display Modular logger, extension possible with various units (version -01 with wireless LAN) 1 channel, programmable, industrial use, also ATEX 2 channel, programmable, industrial use, also ATEX Industrial use, channel extension with multiplexer Eurocard model, LabVIEW compatible

Copyright by Hukseflux. Version 2404. Page 4/5. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com

Hukseflux
Thermal Sensors

Table 2 Examples of different electronics compatible with Hukseflux heat flux sensors. This brochure shows a summary only and does not show all relevant electronics specifications. Contact Hukseflux for a final check of your proposed solution.

Fluke

287

LCD screen, memory

1 (HF)

1000

12

card, USB and bluetooth

**

Ahlborn

ALMEMO 710 Touchscreen, memory

10 (HF + T)

3000

10

card

Can handle type K thermocouple, not type T from FHF, optional Infra-Red temperature sensor ALMEMO connector needs to be fitted to the heat flux sensor.