Hukseflux IHF02 User manual

Copyright by Hukseflux | manual v1907 | www.hukseflux.com | [e-mail]
USER MANUAL IHF02
Ultra sensitive industrial heat flux sensor
Hukseflux
Thermal Sensors

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Warning statements
Follow the installation instructions of this user
manual.
Putting more than 12 Volt across the sensor wiring
can lead to permanent damage to the sensor.
Do not use “open circuit detection” when measuring
the sensor output.
Do not apply a point load on the sensor.
Twisting the metal sheathed cable might damage it.
Only for supply with the optional CE type
examination (ATEX) certificate: ask the supplier for
ATEX rated operating conditions.

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Contents
Warning statements 2
Contents 3
List of symbols 4
Introduction 5
1Ordering and checking at delivery 9
1.1 Ordering IHF02 9
1.2 Included items 9
1.3 Quick instrument check 10
2Instrument principle and theory 11
3Specifications of IHF02 13
3.1 Specifications of IHF02 13
3.2 Dimensions of IHF02 16
4Standards and recommended practices for use 17
4.1 Heat flux measurement in industry 17
5Installation of IHF02 18
5.1 Site selection and installation in industry 18
5.2 Use of the magnet frame 21
5.3 Electrical connection 23
5.4 Requirements for data acquisition / amplification 24
6Maintenance and trouble shooting 25
6.1 Recommended maintenance and quality assurance 25
6.2 Trouble shooting 26
6.3 Calibration and checks in the field 27
7Appendices 29
7.1 Appendix on uncertainty evaluation 29
7.2 Appendix on cable extension / replacement 29
7.3 Appendix on calibration hierarchy 30
7.4 Appendix on black coating 30
7.5 Appendix on correction for temperature dependence 31
7.6 Appendix on measurement range for different temperatures 32
7.7 Appendix on use in (potentially explosive) environments 33
7.8 EU declaration of conformity 34

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List of symbols
Quantities Symbol Unit
Heat flux ΦW/m²
Voltage output U V
Sensitivity S V/(W/m2)
Temperature T °C
Thermal resistance per unit area Rthermal,A K/(W/m²)
Subscripts
property of the object on which IHF02 is mounted heatsink
maximum allowed value maximum

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Introduction
IHF02 ultra sensitive industrial heat flux sensor measures heat flux and temperature,
typically in industrial high-temperature environments. The instrument is waterproof,
withstands high pressures and is extremely robust. IHF02 is 25 times more sensitive
than model IHF01, making it suitable for use at relatively low heat flux levels. It replaces
model HF01 high temperature heat flux sensor. IHF02 complies with industrial safety
standards, such as CE and ATEX for explosive areas, and is particularly suitable for
trend-monitoring and comparative testing.
IHF02 measures heat flux and surface temperature of industrial equipment like furnaces,
boilers, fluidised beds, distillation columns and ovens. The sensors inside IHF02, a
thermopile and a type K thermocouple, are protected by a fully sealed stainless steel
body. It is suitable for long-term use at one location as well as surveys at multiple
locations. IHF02 measures heat flux through the object on which it is mounted, in W/m2,
as well as the temperature in °C. An optional magnet frame is offered for easy mounting
on magnetic surfaces.
IHF02 is 25 times more sensitive than model IHF01, so that, with the same
measurement accuracy of its output voltage, it can be used to measure much lower heat
flux levels. When equipped with the optional magnet frame and optional black coating,
IHF02 replaces model HF01 high temperature heat flux sensor.
Figure 0.1 IHF02 ultra sensitive industrial heat flux sensor

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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 sensor as well as the high-
temperature cable and armour withstand temperatures up to 900 °C. The temperature range
is reduced to 650 °C in case the optional black coating is used. The magnet frame can be
used up to 500 °C. The low-temperature extension cable has a jacket of PTFE type plastic.
Operation
Using IHF02 is easy. It can be connected directly to commonly used data logging
systems. The heat flux, Φ, in W/m2, is calculated by dividing the IHF02 output, a small
voltage U, by the sensitivity S.
The measurement function of IHF02 is:
Φ = U/S (Formula 0.1)
The sensitivity is provided with IHF02 on its product certificate. Equipped with heavy-duty
cabling and a fully stainless steel casing, preventing moisture from penetrating the sensor,
IHF02 has proven to be very reliable. It survives long-term outdoor installation.
Figure 0.3 IHF02 ultra sensitive industrial heat flux sensor with optional magnet frame
seen from above. The part of the cabling closest to the sensor is a special high-temperature
metal sheathed cable with an interlocked spiral stainless steel armour.

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IHF02 advantages
•high sensitivity
•robust
•suitable for use at high temperatures
•IP protection class: IP67
•signal wires electrically insulated from the sensor body
Suggested use
trend-monitoring and comparative measurement of heat flux and surface temperature in
industrial installations, such as the shell of aluminium reduction cells.
Figure 0.2 IHF02 industrial heat flux sensor mounted on an object using spring-loaded
bolts (on the left), and with IHF02’s easy-to-use optional magnet frame (on the right).
The instrument is suitable for long-term use at one location as well as for survey purposes at
multiple locations, also outdoor.
Calibration
IHF02 calibration is traceable to international standards. The factory calibration method
follows the recommended practice of ASTM C1130-17. IHF02 is calibrated at room
temperature, mounted on a metal heat sink.
Trend monitoring and comparative measurement
IHF02 is most suitable for relative measurements using one sensor, i.e. monitoring of
trends relative to a certain reference point in time or comparing heat flux at one location
to the heat flux at another location. If the user wants to perform accurate absolute
measurements with IHF02, as opposed to relative measurements, the user must make
his own uncertainty evaluation and correction for systematic errors. See the Appendix on
uncertainty evaluation. However, in many situations the analysis of trends is sufficient.
In that case a high absolute measurement accuracy is not needed, and a formal
uncertainty evaluation is not necessary.

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See also
•model IHF01 for an industrial heat flux sensor less sensitive than IHF02, but more
economic
•model HF05 for a heat flux sensor with a high sensitivity at a lower temperature range
•our complete range of heat flux sensors
•our industrial heat flux sensors (PDF)
Figure 0.3 IHF02 with its optional magnet frame for easy mounting on magnetic surfaces

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1Ordering and checking at delivery
1.1 Ordering IHF02
The standard configuration of IHF02 is with 1 metre high-temperature cable and 3
metres low-temperature extension cable.
Common options are:
•magnet frame for easy mounting on magnetic surfaces, suitable for survey purposes
as well as for permanent mounting
•black coating
•longer cable (specify total cable length for both cable types in m)
•EC type examination certificate (ATEX) II 2 G EEx d IIC T6
•connector at IHF02 cable end
•extension cable with 2 connectors matching cable connector and chassis connector
(specify cable length in m)
•chassis connector with internal wiring
(colour code of wiring identical to cable colour code)
1.2 Included items
Arriving at the customer, the delivery should include:
•heat flux sensor IHF02
•with cables of the length as ordered
•any other option as ordered
•product certificate matching the instrument serial number
Figure 1.2.1 IHF02 industrial heat flux sensor as delivered in its standard configuration

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1.3 Quick instrument check
A quick test of the instrument can be done by connecting it to a multimeter.
1. Check the electrical resistance of the heat flux sensor between the black [-] and red
[+] wires and the thermocouple between the green [+] and white [-] wires. Measure the
sensor resistance first with one polarity, then reverse the polarity. Take the average
value. Compare the results with the resistance values on the product certificate. Infinite
resistance indicates a broken circuit; zero or a lower than 1 Ω resistance indicates a short
circuit.
2. Check if the heat flux sensor reacts to heat: put the multimeter at its most sensitive
range of DC voltage measurement. Expose the sensor to a strong heat source, for
instance using a heat gun. Exposing the side flush with flanges should generate a
positive signal, doing the same at the opposite side, the sign of the output voltage
reverses.
Also look at the reaction of the thermocouple to heat.
3. Inspect the instrument for any damage.
4. Check the sensor serial number engraved on the transition piece against the certificate
provided with the sensor.