SIST EN 17690-1:2024
(Main)Components for BAC Control Loop - Sensors - Part 1: Room temperature sensors
Components for BAC Control Loop - Sensors - Part 1: Room temperature sensors
This document specifies requirements and test methods for room temperature sensors used to control the room temperature.
This document is applicable to wall mounted and flush mounted room temperature sensors.
The following aspects are not covered by this document:
- pendulum temperature sensors;
- ceiling mounted temperature sensor;
- extract air temperature sensors.
NOTE The measured value available at the output of the sensor is influenced by the place where the sensor device is located and factors such as air velocity, wall temperature, self/waste heating of the device and the air temperature. The perceived temperature, which is important for the well-being of a person, depends among other factors on air temperature, temperature of the surrounding walls and air flow rate as indicated in EN ISO 7730.
The temperature sensor element can be combined with other sensors in one device. This document only deals with the room temperature sensing of this devices. Other sensors are not covered except of their influence on the room temperature sensing (e.g. self-heating).
This document specifies sensor characteristics contributing to the determination of the control accuracy of individual zone controller according to EN 15500 1.
Komponenten für BAC-Regelkreis - Sensoren - Teil 1: Raumtemperaturfühler
Dieses Dokument legt Anforderungen und Prüfverfahren für zur Regelung der Raumtemperatur verwendete Raumtemperatursensoren fest.
Dieses Dokument gilt für wandmontierte und bündig montierte Raumtemperatursensoren.
Die folgenden Aspekte werden in diesem Dokument nicht behandelt:
- Pendeltemperatursensoren;
- deckenmontierter Temperatursensor;
- Ablufttemperatursensoren.
ANMERKUNG Der am Ausgang des Sensors verfügbare gemessene Wert wird durch die Position des Sensors und Faktoren wie Luftgeschwindigkeit, Wandtemperatur, Eigenerwärmung/Abwärme des Geräts und die Lufttemperatur beeinflusst. Die wahrgenommene Temperatur, die für das Wohlbefinden einer Person wichtig ist, hängt von anderen Faktoren wie der Lufttemperatur, der Temperatur der umgebenden Wände und dem Luftstrom nach EN ISO 7730 ab.
Das Temperatursensor-Element kann mit anderen Sensoren in einem Gerät kontrolliert werden. Dieses Dokument behandelt nur die Raumtemperaturmessung dieses Geräts. Andere Sensoren werden lediglich hinsichtlich ihres Einflusses auf die Temperaturmessung (z. B. Eigenerwärmung) behandelt.
Dieses Dokument legt Sensoreigenschaften fest, die zu der Bestimmung der Regelgenauigkeit einzelner Zonenregler nach EN 15500 1 beitragen.
Composants d'une boucle de régulation - Capteurs - Partie 1: Capteurs de température
Le présent document spécifie les exigences et les méthodes d'essai pour les capteurs de température ambiante utilisés pour réguler la température ambiante.
Le présent document couvre les capteurs de température ambiante à montage mural et encastrés.
Les aspects suivants ne sont pas couverts par le présent document :
- capteurs de température pendulaires ;
- capteurs de température montés au plafond ;
- capteurs de température d'air extrait.
NOTE La valeur mesurée disponible à la sortie du capteur est influencée par l'endroit où se trouve le dispositif de détection et par des facteurs tels que la vitesse de l'air, la température des parois, l'auto-échauffement ou l'échauffement résiduel du dispositif et la température de l'air. La température perçue, qui est importante pour le bien-être d'une personne, dépend entre autres facteurs de la température de l'air, de la température des parois environnantes et du débit d'air, comme indiqué dans l'EN ISO 7730.
L'élément capteur de température peut être combiné avec d'autres capteurs dans un même dispositif. Le présent document ne traite que de la détection de la température ambiante de ces dispositifs. Les autres capteurs ne sont pas couverts, à l'exception de leur influence sur la détection de la température ambiante (par exemple, l'auto-échauffement).
Le présent document spécifie les caractéristiques des capteurs contribuant à la détermination de la précision de régulation du régulateur de zone individuel selon l'EN 15500 1.
Sestavni deli za krmilno zanko BAC - Senzorji - 1. del: Senzorji za sobno temperaturo
Ta dokument določa zahteve in preskusne metode za senzorje za sobno temperaturo, ki se uporabljajo za regulacijo temperature v prostoru.
Ta dokument obravnava senzorje za sobno temperaturo, ki so nameščeni na steno in vgreznjeno.
Ta dokument ne zajema:
– nihajnih senzorjev temperature;
– senzorjev temperature, nameščenih na strop;
– senzorjev temperature pri odvajanju zraka.
OPOMBA: Na izmerjeno vrednost, ki je na voljo na izhodu senzorja, vplivajo lokacija senzorja in dejavniki, kot so hitrost zraka, temperatura stene, samo/odpadno ogrevanje naprave in temperatura zraka. Zaznana temperatura, ki je pomembna za dobro počutje osebe, je med drugim odvisna od temperature zraka, temperature okoliških sten in pretoka zraka, kot je navedeno v standardu EN ISO 7730.
Element senzorja temperature je mogoče kombinirati z drugimi senzorji v eni napravi. Ta dokument obravnava samo zaznavanje sobne temperature teh naprav. Drugi senzorji niso zajeti, razen njihov vpliv na zaznavanje sobne temperature (npr. samoogrevanje).
Ta dokument določa značilnosti senzorja, ki prispevajo k določanju natančnosti naprave za regulacijo posameznih con v skladu s standardom EN 15500-1.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2024
Sestavni deli za krmilno zanko BAC - Senzorji - 1. del: Senzorji za sobno
temperaturo
Components for BAC Control Loop - Sensors - Part 1: Room temperature sensors
Komponenten für BAC-Regelkreis - Sensoren - Teil 1: Raumtemperaturfühler
Composants d'une boucle de régulation - Capteurs - Partie 1: Capteurs de température
Ta slovenski standard je istoveten z: EN 17690-1:2023
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17690-1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2023
EUROPÄISCHE NORM
ICS 17.200.20; 91.140.10
English Version
Components for BAC control loop - Sensors - Part 1: Room
temperature sensors
Composants d'une boucle de régulation - Capteurs - Komponenten für den BAC-Regelkreis - Sensoren - Teil
Partie 1 : Capteurs de température 1: Raumtemperaturfühler
This European Standard was approved by CEN on 1 October 2023.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17690-1:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Symbols, units, subscripts and abbreviations . 8
5 Room temperature sensor device . 9
6 Requirements . 10
6.1 Electrical requirements . 10
6.1.1 Electromagnetic compatibility . 10
6.1.2 Degree of protection . 10
6.2 Declarations by the manufacturer . 10
6.2.1 General. 10
6.2.2 Protection class . 10
6.2.3 Measuring range . 10
6.2.4 Sensor (device) accuracy . 10
6.2.5 Time constant t . 11
6.2.6 Wall coupling coefficient k . 11
W
6.2.7 Self-heating compensation . 12
6.2.8 Output signals . 12
6.2.9 Power supply . 13
6.2.10 Power consumption of the device . 13
6.2.11 Electrical connection . 13
6.2.12 Dimensions. 13
6.2.13 Weight . 13
6.2.14 Environmental conditions . 13
7 Test set-up . 13
7.1 Test equipment . 13
7.1.1 Climatic chamber . 13
7.1.2 Wall modules . 15
7.2 Test installation . 19
7.2.1 Mounting of the Device Under Test (DUT) . 19
7.2.2 Wiring of the room sensor devices . 19
7.2.3 Reference sensor position . 19
7.3 Temperature homogeneity . 21
7.4 Determination of the mean air velocity . 22
7.5 Homogeneity of air velocity . 22
8 Test methods . 23
8.1 Sensor accuracy . 23
8.1.1 General. 23
8.1.2 Test conditions sensor accuracy test . 23
8.1.3 Impact of temperature variation Δϑ . 24
tvar
8.1.4 Impact of air velocity variation Δϑ . 24
airvel
8.1.5 Impact of power supply of the device Δϑ . 25
psup
8.2 Time constant . 25
8.2.1 General . 25
8.2.2 Test conditions . 26
8.3 Wall coupling. 27
8.3.1 General . 27
8.3.2 Test conditions . 28
8.4 Power consumption measurement . 29
8.4.1 General . 29
8.4.2 Average active power . 29
8.4.3 Average apparent power . 30
8.4.4 Inrush peak current and periodic peak current measurement. 30
9 Marking and documentation . 30
9.1 Marking . 30
9.2 Documentation . 31
Annex A (informative) Measurements . 32
A.1 24 V power supply / 0 V to 10 V sensor output . 32
A.2 24 V power supply / 4 mA to 20 mA sensor output . 33
A.3 24 V power supply (4 mA to 20 mA in the loop), 4 mA to 20 mA sensor output . 34
A.4 24 V power supply, sensor output: Bus signal (e.g. KNX) . 35
A.5 24 V power supply: bus powered, sensor output: Bus signal (e.g. KNX). 36
A.6 Inrush and periodic peak current measurement . 36
A.7 Correction factor air velocity inside the test chamber . 37
Bibliography . 41
European foreword
This document (EN 17690-1:2023) has been prepared by Technical Committee CEN/TC 247 “Building
Automation, Controls and Building Management”, the secretariat of which is held by SNV.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document is part of a series of standards on Components of Building Automation and Control loop.
A list of all parts in a series can be found on the CEN website.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
Various EU Directives and National Regulations regarding energy saving and energy performance of
buildings require proof of energy efficiency.
These requirements and rising energy costs are encouraging owners and occupiers of buildings to reduce
their energy consumption. The cost for energy will be a critical factor in property rental and sale in the
future.
Building Automation and Controls (BACs) have a strong impact on the energy performance of a building.
This is shown in the existing Building Automation and Control (BAC) standards (mainly EN ISO 52120,
parts 1 and 2, and EN 15500, parts 1 and 2). The standards also show the importance of BAC quality to
achieve the desired comfort (e.g., human health and productivity) at maximum efficiency via control
accuracy, BAC functions and BAC strategies.
For the measurement of the control accuracy (CA value) based on European standard EN 15500-1 and its
accompanying Technical Report CEN/TR 15500-2, a controller is tested as part of a control loop,
consisting of the loop elements: room temperature sensor, controller, actuator and valve as shown in
Figure 1:
Key
1 application of a control loop (example water flow heating system)
2 temperature sensor
3 controller
4 actuator
5 valve
Figure 1 — Control loop
A controller can be used in combination with different control loop elements, if they fulfil the
requirements of the interfaces to each other, and if the basic characteristics of the replaced control loop
elements are the same.
This standard EN 17690 with its parts and some planned standards on valves and actuators will cover
the different components used in conjunction with a BAC controller. All these components contribute to
the control accuracy of a control loop. These standards will classify the components.
1 Scope
This document specifies requirements and test methods for room temperature sensors used to control
the room temperature.
This document is applicable to wall mounted and flush mounted room temperature sensors.
The following aspects are not covered by this document:
— pendulum temperature sensors;
— ceiling mounted temperature sensor;
— extract air temperature sensors.
NOTE The measured value available at the output of the sensor is influenced by the place where the sensor
device is located and factors such as air velocity, wall temperature, self/waste heating of the device and the air
temperature. The perceived temperature, which is important for the well-being of a person, depends among other
factors on air temperature, temperature of the surrounding walls and air flow rate as indicated in EN ISO 7730.
The temperature sensor element can be combined with other sensors in one device. This document only
deals with the room temperature sensing of this devices. Other sensors are not covered except of their
influence on the room temperature sensing (e.g. self-heating).
This document specifies sensor characteristics contributing to the determination of the control accuracy
of individual zone controller according to EN 15500-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 215, Thermostatic radiator valves — Requirements and test methods
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)
EN 60730-1, Automatic electrical controls for household and similar use — Part 1: General requirements
(IEC 60730-1)
IEC 60721-3-2, Classification of environmental conditions — Part 3-2: Classification of groups of
environmental parameters and their severities — Transportation and Handling
IEC 60721-3-3, Classification of environmental conditions — Part 3-3: Classification of groups of
environmental parameters and their severities — Stationary use at weatherprotected locations
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
measuring range
range of measured values for a measurand in which specified error limits are not exceeded
Note 1 to entry: The output or indication range (e.g. display) can be the same as the measuring range, but this is
not always the case. If the indication range is larger than the measuring range, larger or unspecified error limits
shall be considered.
3.2
time constant
t
time the sensor needs after a temperature step to reach 63,2 % of the temperature step range
3.3
sensor accuracy
deviation of the measured room temperature of the sensor to the room temperature within the operation
range
3.4
wall coupling
ratio for the influence of the wall temperature on the measured temperature of the sensor
3.5
turbulence degree
value characterizing the dimension of the turbulence of an air flow which superposes a principal direction
according to EN 215
3.6
waste heat
total heat produced inside the device independent on the heat source
3.7
active sensor
sensor producing a change in some active electrical quantity such as voltage as a result of temperature
measurement
Note 1 to entry: Active sensor could be analogue or digital.
Note 2 to entry: Active sensors analogue generates a signal like electrical current or voltage in response to the
measured room temperature and require an external power source to operate.
Note 3 to entry: Active sensors digital deliver the measured value as specified by the communication protocol and
they can be powered by the communication interface or an external power source.
Note 4 to entry: Wireless sensors are included.
3.8
passive sensor
sensor producing a change in some passive electrical quantity such as resistance as a result of
temperature measurement
3.9
room temperature
operative temperature in the occupied zone
Note 1 to entry: For operative temperature see EN ISO 7730.
3.10
measured room temperature
temperature measured by the sensor inside the sensor device at the place where it is located in the room
Note 1 to entry: The measured temperature depends on the air temperature, radiation from surrounding surfaces
and heat conductivity from the wall on which the sensor device is mounted.
Note 2 to entry: The amount of heat by radiation and convection resulting in the measured temperature need not
to be equivalent to the operative temperature.
4 Symbols, units, subscripts and abbreviations
For the purposes of this document, the symbols and units as given in Table 1, the subscripts as given in
Table 2 and the abbreviations as given in Table 3 apply.
Table 1 — Symbols and units
Symbol Name of quantity Unit
f factor -
k coefficient %
I current A
P power W
q volume flow 3
m /h
T thermodynamic temperature K
t time, period of time s
u velocity m/s
ν kinematic viscosity 2
m /s
t time constant min
δ thickness m
ϑ Celsius temperature °C
Δ delta (difference) prefix to be combined
with symbols
Table 2 — Subscripts
Subscript Explanation
corr correction
ccs centre of cross section
cots complete test section
ipc inrush peak current
ppc periodic peak current
S sensor
Su power supply
W wall
0 base, reference
step temperature step for
time constant
tvar temperature variation
airvel air velocity
psup power supply
Table 3 — Abbreviations
Abbreviation Explanation
AC alternate current
DC direct current
AHU air handling unit
SELV safety extra-low voltage
DUT device under test
5 Room temperature sensor device
The room temperature sensor devices according to this document consist of a sensing element and a
housing with or without internal electronics.
In this document room temperature sensor device and room temperature sensor are used as equivalent.
For the sensing element, the term room temperature sensor element is used.
It can be combined with other sensor elements (e.g. CO , relative humidity) or control elements (e.g.
room controller) in the same housing. The other elements are not part of this document except of their
influence on the room temperature sensing (e.g. self-heating).
The sensor output signal can be active analogue (e.g. voltage/current), active digital (e.g. communication
bus incl. wireless) or passive (e.g. resistive).
6 Requirements
6.1 Electrical requirements
6.1.1 Electromagnetic compatibility
Room temperature sensors shall meet the requirements of EN 60730-1, for use in residential, commerce,
light industrial and industrial environments.
6.1.2 Degree of protection
Room temperature sensors shall comply with protection degree of housing: IP30 according to EN 60529.
6.2 Declarations by the manufacturer
6.2.1 General
In the following part, several useful declarations of characteristics are listed.
If they are declared by the manufacturer, they shall be measured as described in Clause 8 or according to
the referenced standard.
NOTE Variants of room temperature sensor devices can be grouped according to their physical behaviour,
design or measurement behaviour.
Declarations can be made for groups of sensors. In this case, the specific values or characteristics of single
products can differ but shall be within the specified range. (Better than specified values).
6.2.2 Protection class
Protection class specifies the level against electric shock e.g. protection class: III according to the
definition for class III in EN 60730-1.
6.2.3 Measuring range
The manufacturer shall declare the measuring range of the sensor device, e.g. from 0°C to 50°C.
6.2.4 Sensor (device) accuracy
The accuracy of the sensor device depends on various factors, as for example:
— accuracy of the sensing element;
— accuracy and resolution of the AC/DC conversion;
— numerical errors in the signal conversion;
— accuracy and resolution of the DC/AC conversion;
— electrical influence of supply voltage;
— electrical influence of the attached controlling element (burden, ….);
— over speaking (cross influences) of signal outputs;
— noises on the output signal itself;
— resolution of a communication bus or protocol;
— waste heat effects.
The manufacturer shall declare the accuracy at a reference temperature in a certain range.
For example, the following information may be declared as described in Table 4.
Table 4 — Example of accuracy declaration
Characteristics Value(s) Unit
accuracy of 20°C or 25°C ±x K
sensing element
accuracy of 15°C to 35°C ±y K
sensing element
in the range of
The following additional information may be declared by the manufacturer:
— impact of temperature variation;
— impact of air speed variation;
— impact of power supply variation.
6.2.5 Time constant t
The time constant t is the time in minutes until the temperature sensor reading (output signal
converted into a temperature value) shows 63,2 % of the temperature step. It shall be declared in minutes
with a maximum of one digit after the decimal point.
Table 5 shows example of declaration of time constant t .
Table 5 — Example of declaration for Time constant τ
Type of declaration Value(s) Unit
by product 17,6 or < 19 min
by range of products < 19 min
6.2.6 Wall coupling coefficient k
W
The wall coupling coefficient k in percent determines the influence of the wall temperature on the
W
measured room temperature.
Table 6 shows example of declaration of wall coupling k .
W
Table 6 — Example of declaration for wall coupling k
W
Type of declaration Value(s) Unit
by product approximately 45 %
by range of products 35 to 50 %
6.2.7 Self-heating compensation
The manufacturer may declare the self-heating compensation, e.g. default compensation of 0,5 K.
NOTE The self-heating compensation used by the manufacturer is an indication about possible measurement
deviations, caused by other boundary conditions than those assumed by the manufacturer.
6.2.8 Output signals
Different types of output signals can apply. Table 7 gives different types of analogue output signals.
Table 7 — Analogue signals
Type of output Signals
passive sensors characteristic curve of sensing element
active sensors analog output signal (e.g. 0 V to 10 V, or 4 mA to 20 mA)
Table 8 gives different types of digital output signals.
Table 8 — Example of digital signals
Type of output value Transmission mode
digital communication protocol
data points
resolution of measured value
repetition rate, e.g. heart beat
in seconds, or change of value
(in 0,01 K)
6.2.9 Power supply
In the following, different examples of power supply are given in Table 9.
Table 9 — Power supply types
Types Descriptions
operating voltage e.g. DC 12 or 15 V (SELV) / AC 24V ± 20 %
operating frequency 50/60 Hz (for AC powered devices)
device specific power supply N/A
6.2.10 Power consumption of the device
For active sensors, average active power and average apparent power shall be declared. Average active
power shall be measured at nominal voltage and nominal load, where average apparent power shall be
measured at nominal voltage and maximum load.
If significant peak consumption (≥30 % of average consumption) is measured, this value should also be
declared by the manufacturer. This is important for the dimensioning of the power supply and the supply
lines.
For battery powered devices, average lifetime of the battery shall be declared.
6.2.11 Electrical connection
The type of electrical connection should be given by the manufacturer e.g. screw terminals for 2 wires of
2 2
0,25 mm to 1,5 mm .
6.2.12 Dimensions
The dimensions of room temperature sensors should be given by the manufacturer.
6.2.13 Weight
The weight of room temperature sensors including packaging should be given by the manufacturer.
6.2.14 Environmental conditions
Environmental conditions (climatic conditions and mechanical conditions) for transport and operation
according to IEC 60721-3-2 and IEC 60721-3-3 shall be given by the manufacturer.
7 Test set-up
7.1 Test equipment
7.1.1 Climatic chamber
The tests shall be performed in a climatic chamber. It consists of an outer (1) and an inner chamber (2)
(chamber-in-chamber principle). The outer chamber (1) is thermally insulated and shall provide at least
50 mm air space around the inner chamber.
The inner chamber (2) is installed in the upper part of the outer chamber (1).
The inner chamber (2) consists of installations for generating the laminar air flow (5), the test section (3),
perforated plates at the ceiling of the test section (6) and a collecting space (14) above the test section.
The test section (3) shall have quadratic cross section of 0,6 m × 0,6 m and be at least 0,5 m high.
The test sample is installed on a wall module (4) in the centre of the test section (3) and parallel to the
walls of test section.
Supply air (7) is blown into the lower part of the outer chamber (1).
A part of the supply air (7) is used in the inner chamber (2). The air for test section (3) flows from the
other chamber (1) through the installations for generating laminar air flow (5) to the test section (3).
This should allow to build up a constant, homogenous laminar flow profile inside the test section (3).
The air flow through the test section (3) is measured by a Venturi nozzle (9) in the extract air (8) of the
inner chamber. A damper (10) is used to control the air flow through the inner chamber (2).
The remaining part of the supply air (7) flows around the inner test chamber (2) to the extract air outlet
(13) of the outer chamber (1) and thereby helps to thermally insulate the inner chamber (2) from the
environment conditions.
The extract air damper of the outer chamber (11) is used for the air balancing of the test rig.
An electric heater (12) in the supply air part (7) enables rapid changes of the supply air temperature as
needed for time constant measurements.
Figure 2 shows the principle of the climatic chamber.
Key
1 outer chamber
2 inner chamber (test chamber)
3 test section (laminar air flow)
4 wall module
5 installations for generating laminar flow
6 perforatet plates (ceiling of the test chamber)
7 supply air from AHU
8 extract air inner chamber to AHU
9 Venturi (flow measurement)
10 flow control damper inner chamber
11 flow control damper outer chamber
12 electrical heater
13 extract air outer chamber to AHU
14 collecting space
Figure 2 — Principle of the climatic chamber
7.1.2 Wall modules
7.1.2.1 Wall module for measuring sensor device accuracy and time constant
The wall module is constructed of a thermal insulation material of expanded polystyrene foam EPS15
(density 15 kg/m ) with a thickness of 50 mm. The size of the wall shall be 300 mm × 300 mm. The lower
edge shall be constructed with an angle of 45° to optimize the air flow for time constant measurements.
Surface mounted sensor devices shall be mounted on the wall with a distance of 100 mm from the bottom
side of the device to the lower edge of the wall (see Figure 3).
Wall integrated sensor devices shall be mounted inside the conduit box provided by the manufacturer.
The conduit box is installed in the centre of the wall module. The backside of the conduit box shall be
thermally insulated by the same insulation material (see Figure 4). For this type of room temperature
sensor the distance to the lower edge of the test wall depends on the design of the Device Under Test
(DUT).
Dimensions in millimetres
Key
1 insulation (EPS15)
2 device under test
NOTE The tolerance for the dimensions in the figure is ±1 mm.
Figure 3 — Wall module for surface mounted sensor devices
Dimensions in millimetres
Key
1 insulation (EPS15)
2 conduit box specified by the manufacturer (in the centre of the test wall)
NOTE The tolerance for the dimensions in the figure is ±1 mm.
Figure 4 — Wall module for the wall integrated sensor devices
7.1.2.2 Wall module for measuring wall coupling
The wall is constructed of a thermal insulation material of expanded polystyrene foam EPS15 (density
15 kg/m ) with a thickness of 50 mm.
The size of the wall shall be 300 mm × 300 mm. The surface of the wall module is covered with a thin
layer of heating elements and an aluminium plate for temperature control of the surface temperature.
The aluminium plate shall have a thickness of 4 mm and be blank to avoid irradiation. Integrated in the
centre of the wall shall be an aluminium box of a space of 80 mm × 80 mm × 56 mm.
Wall integrated sensor devices shall be mounted inside the conduit box. The backside of the conduit box
shall be thermally insulated by the same insulation material. The opening of the conduit box shall be
closed using adapter plates according to the sensor device under test, (e.g. for Swiss conduit boxes) on
which the sensor device is mounted (see Figure 5).
Dimensions in millimetres
Key
1 insulation
2 heating elements behind the aluminium plate
3 aluminium 4 mm (with a tolerance of ±0,1 mm)
4 space representing a conduit box
5 adapter plate mounted in front of aluminium conduit box
6 adapter plate for (old) Swiss conduit box made of 4 mm aluminium (example)
The 4 mm aluminium plate may cover the whole surface, but it is also allowed to reduce its width for
better adaption to existing heating elements.
NOTE The tolerance for the dimensions in the figure is ±1 mm.
Figure 5 — Wall module for measuring the wall coupling and an example of an adapter plate
For surface mounted sensor devices, the space for the conduit box shall be covered by an aluminium plate
on which the sensor device is mounted (see Figure 6).
The sensor device under test shall be mounted with a distance of 100 mm from the bottom side of the
device to the lower edge of the wall.
Dimensions in millimetres
Key
1 insulation
2 heating elements behind the aluminium plate
3 aluminium 4 mm (with a tolerance of ±0,1 mm)
4 space representing a conduit box
5 adapter plate covering the space in the heated wall module
6 device under test
NOTE The tolerance for the dimensions in the figure is ±1 mm.
Figure 6 — Example of a wall module for measuring the wall coupling of surface mounted sensor
devices
7.2 Test installation
7.2.1 Mounting of the Device Under Test (DUT)
The test sample (DUT) is mounted on a wall module selected according to the test method.
The wall module itself is installed inside the test chamber with 100 mm between the lower edge of the
wall module and the perforated floor of the test chamber.
7.2.2 Wiring of the room sensor devices
The wires shall be led through the rear side of the wall modules and connected to the sensor device. If a
connection from the backside is not possible due to the construction of the sensor device the wires shall
be connected from the upper side.
The wiring shall be done in such a way that the influence of the wiring on the sensor output is negligible.
7.2.3 Reference sensor position
The 4 sensors on the wall module for wall coupling tests and the shielded reference sensor in front of the
DUT shall be mounted as shown in the Figures 7 to 9.
Dimensions in metres
Key
1 shielded reference temperature sensor
2 device under test
3 surface temperatures on aluminium wall
4 test wall
NOTE The tolerance for the dimensions in the figure is ±5 mm.
Figure 7 — Reference sensor position, side view
Dimensions in metres
NOTE The tolerance for the dimensions in the figure is ±5 mm.
Figure 8 — Reference sensor position, front view
Dimensions in metres
NOTE The tolerance for the dimensions in the figure is ±5 mm.
Figure 9 — Reference sensor position, top view
7.3 Temperature homogeneity
The temperature of the air flow shall be homogenous on the cross-section of the inner test chamber.
For the verification the temperature shall be measured in a grid of at least 9 measurement points in one
plane of the cross section (3 × 3) with 0,1 m distance from the walls and in the centre of the test section
(see Figure 10). The temperature sensor shall be 0,1 m above the perforated floor of the test chamber.
The air flow shall be in steady-state conditions and constant at 0,10 m/s ± 0,1 m/s and the temperature
within the range of 18 °C to 25 °C. The test chamber shall be empty (no wall module).
Two paired temperature sensors are needed for this test. One sensor remains in the centre position of
the matrix whereas the other sensor is moved to the different positions.
Once steady-state conditions are reached, the deviation between the two sensors shall be less than 0,1 K.
Dimensions in metres
NOTE The tolerance for the dimensions in the figure is ±5 mm.
Figure 10 — Top view of the test section with measurement points
7.4 Determination of the mean air velocity
A direct and accurate air velocity measurement in the range of 0,10 m/s to 0,20 m/s is difficult to perform.
Therefore, the air velocity inside the test chamber will be calculated based on Venturi volume flow
measurement at the outlet of the inner chamber and the cross section of the inner chamber.
For this calculation, the flow profile inside the test chamber (boundary layers on the inner walls of the
test chamber with slower air velocity) shall be taken into account. As the flow profile changes with the
air velocity and also depends on the size and geometry of the inner chamber it is recommended to work
with prespecified tables. Table 10 shows the required air volume flow in the Venturi nozzle that are
required for the mean air velocities needed in the different test cases. The table is only applicable for a
test chamber with 0,6 m × 0,6 m cross section, where the air velocity is measured 0,1 m above the
perforated floor of the test chamber (see also Annex A, A.3).
Table 10 — Required air volume flow in the Venturi nozzle
Volume flow Mean air velocity
in Venturi tube in the centre of the cross section
q u
ccs
[m /h] [m/s]
124,0 0,10
187,6 0,15
For the verification measurement a thermal anemometer shall be used.
The measurement uncertainty of the anemometer shall be ≤ 0,02 m/s.
7.5 Homogeneity of air velocity
The homogeneity of the air velocity is successively verified at the same positions and conditions as the
temperature homogeneity.
After positioning the anemometer at a test position, the test chamber is closed and the air volume flow
through the inner test camber (measured by the Venturi nozzle) is adjusted to 0,1 m/s mean air velocity
in the inner test chamber.
At each test position, the air velocity shall be measured for at least 180 s with a minimum sampling rate
of 1 sample every 5 s.
The local air velocity is then represented by the mean value of the air velocity over the 180 s
measurement period.
By dividing the standard deviation over the 180 s period through the local air velocity over the same
period, the degree of turbulence can be calculated.
At each test position, the difference between the local air velocity (measured by the anemometer) and
the calculated mean air velocity (according to the air volume flow measured by the Venturi nozzle) shall
be smaller than 0,02 m/s, whereas the degree of turbulence shall not exceed 5 %.
8 Test methods
8.1 Sensor accuracy
8.1.1 General
Instead of measuring absolute room temperature sensor device accuracy, the impact of changed
boundary conditions on temperature measurement is evaluated.
All sensor accuracy tests are performed in the climatic chamber. Test facility is described in 7.1.
The test sample is mounted on the wall module (for measuring sensor accuracy and time constant) and
mounted in the centre of the test section. Air velocity and air temperature inside the test chamber and
power supply are set to the initial values. Recoding of the measurement is started. After reaching the
initial steady-state conditions the temperature reading of the test sample, reference air temperature and
air velocity and as well as the current power supply are noted.
Afterwards, one parameter of the boundary conditions is changed.
After reaching again a steady-state conditions the temperature reading of the test sample, reference air
temperature and air velocity and the current power supply are noted.
The impact of the boundary conditions on the room temperature sensor can be calculated as specified.
8.1.2 Test conditions sensor accuracy test
8.1.2.1 Mounting of the Device Under Test (DUT)
The DUT needs to be installed on the wall module for measuring sensor device accuracy and time
constant.
8.1.2.2 Load conditions
The tests for sensor device accuracy are performed at different power supply conditions as declared by
the manufacturer.
8.1.2.3 Measurement tolerance
Measurement uncertainty for temperature measurement shall be ≤ ±0,1 K.
8.1.2.4 Steady-state condition
Steady-state condition is reached as shown in Table 11.
Table 11 — Steady-state conditions
Type of sensor Reaching conditions
Reference Sensor Variation of Reference sensor is ≤ 0,1 K for more than
20 min
Device Under Test Variation of output signal of the DUT is ≤ 0,1 K or
≤ 2 quantization steps for more than 20 min
8.1.2.5 Time constant of reference sensor
The time constant of the reference sensor shall be ≤ 1 min.
8.1.2.6 Temperature homogeneity
Temperature homogeneity in accordance with 7.3 inside of the climatic chamber shall be ≤ ±0,1 K.
8.1.3 Impact of temperature variation Δϑ
tvar
The temperature inside the test chamber is changed for this
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