Hukseflux

Thermal Sensors

TRSYS20

Building thermal resistance measuring system with two measurement locations
TRSYS20 is a high-accuracy measuring system used in determining the in-situ thermal resistance (R-value),thermal conductance (Λ-value), and thermal transmittance (U-value) of building envelope components. The
system is mostly used for measurements according to standard practices of ISO 9869, ASTM C1046 and
ASTM C1155. TRSYS20 is equipped with high-resolution electronics, two heat flux sensors of model HFP01 aswell as two pairs of matched thermocouples for differential temperature measurements. The high-sensitivity
heat flux sensors combined with the robust, high-resolution electronics ensure that TRSYS20 continues making
meaningful measurements when other systems no longer perform; in particular at very low heat fluxes and low
temperature differences across the wall. The matched thermocouple pairs allow measurement of temperature
differences with an uncertainty better than 0.1 °C over the entire temperature range. Two measurement
locations provide redundancy allowing the user to verify that the measurement results are representative forthe building envelope component.

Introduction

Figure 1 TRSYS20: the measuring system consists of 2
HFP01 heat flux sensors and 2 matched thermocouple
pairs (in total 4 temperature sensors) connected to themeasurement and control unit (MCU).

In-situ measurements of thermal resistance or
R-value are often applied in studies of buildings.
Other possibilities are to measure its inverse
value, the thermal conductance which is called
the Λ-value, or to measure the thermaltransmittance or U-value which includes ambient
air boundary layer thermal resistance. Themeasurements of R, are based on simultaneoustime averaged measurement of heat flux Φ inW/m2 through the wall and differential
temperature ΔT in K across the wall:
R = ΔT/Φ
The ISO 9869, ASTM C0146 and ASTM C1115
standards give detailed directions concerning themeasurement method, sensor installation anddata analysis. TRSYS20 is a system formeasuring the heat flux and differential
temperature used in determining the thermal
resistance of building envelope components.

Figure 2 HFP01 heat flux sensor and thermocouples
mounted on a wall.

TRSYS20 consists of two HFP01 heat flux
sensors, two matched thermocouple pairs, ameasurement and control unit (MCU), a power
supply unit (PSU) and a carrying case. The highsensitivity heat flux sensors in combination with
the MCU’s high-resolution electronics ensure thatTRSYS20 continues to make meaningfulmeasurements down to very low heat fluxes. The
matched thermocouple pairs in TRSYS20
measure temperature differences across the wallwith an uncertainty of better than 0.1 °C over theentire rated operating temperature range as
required by ISO 9869 (paragraph 5.2).

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Thermal Sensors

User interface: MCU as a web server
TRSYS20 is controlled via a PC. No software
installation is required. The measurement andcontrol unit (MCU) can be connected to a local
area network (LAN) via ethernet or directly to aPC via USB. The MCU provides a graphical userinterface in the form of a webpage that isaccessible through a web browser. The graphicaluser interface allows the user to start and stop
experiments; to monitor real-time heat flux,
temperature and temperature difference
measurement data; and to review preliminaryresults.
Typical measurements may last 1 to 2 weeks
with a minimum of 3 days. Preliminary data
analysis may be required to determine if
sufficient data has been collected. To provide aquick assessment of the current dataset, theinterface shows a scatter plot of the heat flux
versus temperature difference, a time trace of
the R-value an several data quality indicators.
Using the scatter plot users can check forsufficient correlation in their data set. The time
trace allows checking for convergence. The data
quality indicators follow the criteria outlined inthe ISO 9869 standard.

TRSYS20 specifications
Measurand
Uncertainty of calibration
Measurement resolution
Guard width to thickness ratio

heat flux (2 x)±3 % (k = 2)
0.02 W/m2
5 m/m (as requiredby ISO 9869 D.3.1)

Measurand

temperature
difference (2 x)< ± 0.1 °C (asrequired by ISO9869, paragraph 5.2)
0.02 °CAccuracy

Measurement resolution
Measurand
Thermocouple typeTolerance class
Required data analysis todetermine building R-value andU-valueStandards governing use:

Number of measurement
locations
Cable length per location
Rated operating temperature
range HFP01 and TC
Measurement duration range
Data storage capacity

temperature (4 x)
IEC 60584-3:2007
type KXClass II
to be performed by
the user according toISO and ASTM
standard practices
ISO 9869
ASTM C1046
ASTM C1155
2location 1: 10 m
location 2: 20 m
-30 to +70 °C> 3 days> 30 days

MCU specificationsConnection

Graphical user interface
Supported web browsers
Figure 3 TRSYS20 graphical user interface, accessible
through a web browser.

The system generates a data file, containing themeasurement time, heat flux, temperature andtemperature difference for the two measurement
locations. The data file is stored in the MCU andcan be downloaded through the graphical userinterface. The user is responsible for the data
analysis, calculating the R-, Λ- or U-value of thebuilding envelope according to the ISO 9869 or
ASTM C1155 standards.

Rated operating voltage MCU
Ingress protection class

to local area network(LAN) via ethernet
or directly to PC via
USB
web page via webbrowser
Chrome 10Firefox 4Internet Explorer 9Opera 11Safari 5or later
10 to 16 VDC
IP54

PSU specifications
Input voltage
Ingress protection class110-220 VAC,
50 / 60 Hz
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TRSYS20 advantages•••••

Robust and stable. Equipped with heavyduty components, TRSYS20 is a robust andstable system. Its sensors survive repeatedinstallation necessary in this application
where measuring systems are typically used
at multiple locations over time. The sensors
are water- (rated IP67) and corrosion proof.
Ethernet or USB. TRSYS20 MCU can either
be connected to a local area network (LAN)via its ethernet port or it can be connected
directly to a PC or laptop via USB.
Intuitive and easy to use graphical userinterface. The MCU provides a user interface
in the form of a webpage, accessible througha webbrowser. No software installation isrequired. The graphical user interface
provides an intuitive and easy way ofcontrolling and reviewing experiments.
Simultaneous measurements on twolocations. The two measurement locations
either provide redundancy, allowing the user
to check that the measured values arerepresentative for the wall, or the option tomeasure two different walls in parallel, savingtime.
High-resolution and high-sensitivity.
High-resolution electronics and highsensitivity heat flux sensors allow TRSYS20
to measure very small heat fluxes throughthe wall. Sensor cable shielding ensures thatthe system is insensitive to electrical
disturbances as found in industrial
environments.

Figure 4 The robust and stable TRSYS20 system issupplied in a rugged carrying case for transportation andstorage of the system.

About Hukseflux
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

Suggested use•Heat flux and differential temperature
measurement for building R-value, Λ-value orU-value determination.

Calibration & conformity assessment
Calibration of TRSYS20 components is traceable
to international standards. TRSYS20 is provided
with formally traceable calibration certificates.
HFP01 heat flux sensors are calibrated inaccordance with ASTM C1130. Temperature
difference sensors are “individually” tested asmatched pairs.

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Thermal Sensors

MARKET LEADER IN HEAT FLUX MEASUREMENTTRSYS20 outperforms other models and complies with ISO
and ASTM standards: how?

TRSYS20 is the world’s highest accuracy measuring system for building envelope component thermal resistance measurement. It is one of the few systems withtrue out-of-the-box compliance to ISO 9869. Purchasing a TRSYS20 is a good investment in accurate and stable measurement. TRSYS20 complies with theacceptance interval of the temperature difference measurement specified by ISO 9869 of ± 0.1 °C.
Ethernet or USB connection
Temperature difference sensors: tested for 0.1 °C accuracy
requirements
TRSYS20 matched thermocouple pairs and electronics are tested for 0.1 °C
accuracy over the -10 to 50 °C temperature range as required by ISO 9869.

TRSYS20 measurement and control unit (MCU) can beconnected to a local area network (LAN) via ethernet or
directly to a PC or laptop via USB. An easy to use andintuitive graphical user interface is accessible through a
web browser and does not require software installation.

Best paperwork

High sensitivity HFP01 heatflux sensor

Hukseflux has the paperwork
covered. TRSYS20 is provided
with formally traceablecalibration certificates. HFP01
heat flux sensors arecalibrated in accordance withASTM C1130. Temperature
difference sensors are“individually” tested asmatched pairs.

TRSYS20’s high-sensitivity HFP01
heat flux sensors in combination
with the MCU’s high-resolution
electronics, allows meaningfulmeasurements down to very smallheat fluxes through walls. HFP01 isa robust heat flux sensor with an
integrated passive guard andthermal spreader.

Robust and durable
TRSYS20’s durable sensors can withstand the rough handlingand repeated setup and tear down typical for building
applications. The heat flux sensors and thermocouples arewater- (IP67) and corrosion proof.

Continues measuring when others give up: highresolution AD converter + high-sensitivity sensors
The high-accuracy of the heat flux sensors and temperature
difference measurements, ensure that TRSYS20 continues
measuring when other systems no longer perform; in particular atvery low temperature differences across the wall.

Voltagemeasurement
accuracy
within 1 μV© Copyright by Hukseflux. Version 2301. Page 4/4. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.com