oSIST prEN 81346-2:2025
(Main)Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 2: Classification of objects and codes for classes
Industrial systems, installations and equipment and industrial products - Structuring principles and reference designations - Part 2: Classification of objects and codes for classes
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte - Strukturierungsprinzipien und Referenzkennzeichnung - Teil 2: Klassifizierung von Objekten und Kennbuchstaben für Klassen
Systèmes, installations et équipements industriels, et produits industriels - Principes de structuration et désignations de référence - Partie 2: Classification des objets et codes pour les classes
Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela strukturiranja in referenčne oznake - 2. del: Razvrščanje objektov v razrede in njihove kode
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Industrijski sistemi, inštalacije in oprema ter industrijski izdelki - Načela
strukturiranja in referenčne oznake - 2. del: Razvrščanje objektov v razrede in
njihove kode
Industrial systems, installations and equipment and industrial products - Structuring
principles and reference designations - Part 2: Classification of objects and codes for
classes
Industrielle Systeme, Anlagen und Ausrüstungen und Industrieprodukte -
Strukturierungsprinzipien und Referenzkennzeichnung - Teil 2: Klassifizierung von
Objekten und Kennbuchstaben für Klassen
Systèmes, installations et équipements industriels, et produits industriels - Principes de
structuration et désignations de référence - Partie 2: Classification des objets et codes
pour les classes
Ta slovenski standard je istoveten z: prEN 81346-2:2025
ICS:
01.110 Tehnična dokumentacija za Technical product
izdelke documentation
29.020 Elektrotehnika na splošno Electrical engineering in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
3/1737/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 81346-2 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-08-01 2025-10-24
SUPERSEDES DOCUMENTS:
3/1689/CD, 3/1736/CC
IEC TC 3 : DOCUMENTATION, GRAPHICAL SYMBOLS AND REPRESENTATIONS OF TECHNICAL INFORMATION
SECRETARIAT: SECRETARY:
Sweden Mr Mikael Törnkvist
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TITLE:
Industrial systems, installations and equipment and industrial products - Structuring principles and
reference designations - Part 2: Classification of objects and codes for classes
PROPOSED STABILITY DATE: 2031
NOTE FROM TC/SC OFFICERS:
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1 CONTENTS
3 CONTENTS . 1
4 FOREWORD . 2
5 INTRODUCTION . 4
6 1 Scope . 5
7 2 Normative references . 5
8 3 Terms and definitions . 5
9 4 Classification principles . 7
10 4.1 General . 7
11 4.2 Relation between classification and composition . 7
12 4.3 Classification schemes of this document . 8
13 5 Classification scheme for the inherent function of objects . 8
14 5.1 General . 8
15 5.2 Complete classification scheme . 10
16 6 Classification of constructions and infrastructure . 56
17 6.1 General . 56
18 6.2 Classification of construction complexes . 57
19 6.3 Classification of construction entities . 58
20 7 Classification of spaces . 67
21 7.1 General . 67
22 7.2 Classification of spaces according to their intended activity . 67
23 Annex A (informative) Classification criteria for objects . 77
24 A.1 General . 77
25 A.2 Structure of classes and subclasses . 77
26 A.3 Definition of classes . 78
27 Annex B (informative) Object classes related to a generic process . 79
28 Annex C (informative) Basic requirements for the development of IEC 81346-2 . 80
29 Bibliography . 81
31 Figure 1 – Illustration of a classification hierarchy and a composition hierarchy . 7
32 Figure A.1 – Illustration of class hierarchy . 78
33 Figure B.1 – Object classes related to a generic process . 79
35 Table 1 – Entry classes for inherent function. 9
36 Table 2 – Complete classification scheme for inherent function of objects. 10
37 Table 3 – Classes of construction complexes . 57
38 Table 4 – Classes of construction entities . 58
39 Table 5 – Classification scheme for spaces based on intended activity . 67
IEC CDV 81346-2 © IEC 2025
44 INTERNATIONAL ELECTROTECHNICAL COMMISSION
45 ____________
47 INDUSTRIAL SYSTEMS, INSTALLATIONS
48 AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
49 STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –
51 Part 2: Classification of objects and codes for classes
53 FOREWORD
54 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
55 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
56 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
57 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
58 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
59 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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61 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
62 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
63 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
64 consensus of opinion on the relevant subjects since each technical committee has representation from all
65 interested IEC National Committees.
66 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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76 6) All users should ensure that they have the latest edition of this publication.
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81 Publications.
82 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
83 indispensable for the correct application of this publication.
84 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
85 rights. IEC shall not be held responsible for identifying any or all such patent rights.
86 International Standard IEC 81346-2 has been prepared by IEC technical committee 3:
87 Documentation, graphical symbols and representations of technical information, in cooperation
88 with ISO technical committee 10: Technical product documentation.
89 It is published as a double logo standard.
90 It has the status of a horizontal standard in accordance with IEC Guide 108.
91 This third edition cancels and replaces the second edition published in 2019. This edition
92 constitutes a technical revision.
93 This edition includes the following significant technical changes with respect to the previous
94 edition:
95 a) existing class definitions have been reviewed and further clarified;
IEC CDV 81346-2 © IEC 2025
96 b) Table 2 has been updated to include the information from the former Table 2;
97 c) Table 2 has been further updated with the addition of new classes, modification of class
98 names, and identification of obsolete classes in greyscale font.
99 d) Table 3 has been similarly updated with the addition of new classes, modification of class
100 names, and identification of obsolete classes in greyscale font.
101 e) additional examples have been added to several classes;
102 f) a new classification scheme for construction complexes and construction entities has been
103 added as Table 4 and Table 5, respectively, replacing the corresponding tables in ISO
104 81346-10.
105 g) the former clause 7 "Classification of objects applicable for infrastructure" and the former
106 Annex C "Object classes related to objects in a generic infrastructure" have been deleted
107 following the introduction of ISO 81346-10, ISO 81346-12 and IEC 81346-14;
108 h) the former Annex D "Comparison between Tables 1, 2 and 3 of IEC 81346-2:2019 and
109 Tables 1 and 2 of IEC 81346-2:2009" as this document is a revision of IEC 81346-2:2019
110 and therefore not necessary to maintain.
111 The text of this International Standard is based on the following documents:
FDIS Report on voting
3/xxx/FDIS 3/xxxx/RVD
113 Full information on the voting for the approval of this International Standard can be found in the
114 report on voting indicated in the above table.
115 This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
116 A list of all parts in the IEC 81346 series, published under the general title Industrial systems,
117 installations and equipment and industrial products – Structuring principles and reference
118 designations, can be found on the IEC website.
119 The committee has decided that the contents of this document will remain unchanged until the
120 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
121 the specific document. At this date, the document will be
122 • reconfirmed,
123 • withdrawn,
124 • replaced by a revised edition, or
125 • amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
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129 INTRODUCTION
130 The aim of this document is to establish classification schemes for objects with assigned letter
131 codes for the defined classes, which can be applied throughout all technical areas, e.g. electric,
132 mechanical, process and civil engineering as well as all branches of industry, e.g. energy,
133 chemical, construction, automotive, shipbuilding and marine. The letter codes are intended for
134 use with the rules for the construction of reference designations in accordance with IEC 81346 -
135 1 and other parts of the ISO/IEC 81346 series. The letter codes can also be used ”stand-alone”
136 as a generic type designation where a type of component is to be indicated, for example in
137 specifications.
138 The classification scheme in Clause 5 of this document is an enumerative and faceted
139 classification scheme with the inherent function as the entry class. It is made in accordance
140 with the rules in ISO 704 and the guidelines in ISO 22274.
141 At the entry level, as shown in Table 1, the inherent function is used to narrow down the areas
142 of applicability of the individual classes to a manageable size. For the sub-divisions of the entry
143 classes, faceted approaches are applied to specify the nature of the concepts contained in the
144 leaf classes.
145 By applying this method, this document provides stable class codes for objects (including
146 systems and system elements), which are independent of how the objects are used or applied
147 in any design during the entire lifecycle.
148 Any class is defined by its definition only. Users should select the appropriate class for their
149 object to be classified based on the definition, and not rely upon the class name or the
150 examples.
IEC CDV 81346-2 © IEC 2025
153 INDUSTRIAL SYSTEMS, INSTALLATIONS
154 AND EQUIPMENT AND INDUSTRIAL PRODUCTS –
155 STRUCTURING PRINCIPLES AND REFERENCE DESIGNATIONS –
157 Part 2: Classification of objects and codes for classes
159 1 Scope
160 This part of IEC 81346 establishes classification schemes with defined object classes and their
161 associated letter codes. The codes are primarily intended for use in reference designations and
162 for designation of generic types.
163 The classification schemes are applicable for objects in all technical disciplines and all branches
164 of industry.
165 This document is a horizontal publication also intended for use by technical committees in
166 preparation of publications related to reference designations in accordance with the principles
167 laid down in IEC Guide 108.
168 2 Normative references
169 The following documents are referred to in the text in such a way that some or all of their content
170 constitutes requirements of this document. For dated references, only the edition cited applies.
171 For undated references, the latest edition of the referenced document (including any
172 amendments) applies.
173 IEC 81346-1:2022, Industrial systems, installations and equipment and industrial products –
174 Structuring principles and reference designations – Part 1: Basic rules
175 3 Terms and definitions
176 For the purposes of this document, the terms and definitions given in IEC 81346-1:2022 and
177 the following apply.
178 ISO and IEC maintain terminological databases for use in standardization at the following
179 addresses:
180 • IEC Electropedia: available at http://www.electropedia.org/
181 • ISO Online browsing platform: available at http://www.iso.org/obp
182 3.1
183 inherent function
184 function of an object, independent of any application of the object
185 Note 1 to entry: Inherent is regarded as existing in something as a permanent, essential, or characteristic attribute .
186 3.2
187 classification scheme
188 descriptive information for an arrangement or division of objects into groups based on criteria
189 such as characteristics, which the objects have in common
190 Note 1 to entry: A classification scheme is a concept system used for classifying some objects.
191 [SOURCE: ISO/IEC 11179-3:2023, 3.2.5, modified – Examples have been deleted.]
IEC CDV 81346-2 © IEC 2025
192 3.3
193 class of object
194 set of objects characterized by the same inherent function (3.1)
195 3.4
196 space
197 limited three-dimensional extent defined physically or notionally
198 [SOURCE: ISO 12006-2:2020, 3.1.8]
199 3.5
200 type-of relation
201 relation between two classes where the characteristics defining one of the classes includes that
202 of the other class and at least one additional delimiting characteristic
203 Note 1 to entry: This term corresponds to the term "generic relation" defined in ISO 12006-2:2020, 3.1.4.
204 3.6
205 activity space
206 space (3.4) defined by the spatial extension of an activity
207 Note 1 to entry: A spatial extension of an activity, for example, a table or a bed, and the activity space around them.
208 [SOURCE: ISO 12006-2:2020, 3.1.9]
209 3.7
210 construction complex
211 aggregate of one or more construction entities (3.8) intended to serve at least one function or
212 user activity
213 Note 1 to entry: A construction complex can be analysed and the construction entities that go to make it up, can be
214 identified; e.g. an airport typically is composed of the construction entities runway, control tower, terminal building,
215 aircraft hangar, etc. A business park typically is composed of a number of buildings, access roads and landscaping
216 (each a construction entity in its own right). A motorway from A to B typically is composed of service stations, the
217 motorway pavement, bridges, embankments, landscaping, etc.
218 [SOURCE: ISO 12006-2:2020, 3.4.1]
219 3.8
220 construction entity
221 independent unit of the built environment with a characteristic form and spatial structure,
222 intended to serve at least one function or user activity
223 Note 1 to entry: A construction entity is the basic unit of the built environment. It is recognizable as a physically
224 independent construction even though a number of construction entities can be seen as parts of a particular
225 construction complex. Ancillary works such as access roads, landscaping, service connections, can be regarded as
226 part of a construction entity. Conversely, when ancillary works are of sufficient scale they can be regarded as
227 construction entities in their own right.
228 [SOURCE: ISO 12006-2:2020, 3.4.2, modified – the words "might" and "may" has been
229 replaced by "can".]
230 3.9
231 infrastructure
232 system of facilities, equipment and services needed for the operation of society or an
233 organization
234 [SOURCE: ISO 9000:2015, 3.5.2, modified – "an organization" replaced by " society or an
235 organization".]
IEC CDV 81346-2 © IEC 2025
236 4 Classification principles
237 4.1 General
238 The purpose of classifying is to distinguish among objects in a collection based on
239 differentiation of characteristics of interest. Classes are organized in type-of relations and are
240 defined by different values of a specific characteristic of interest.
241 The classification schemes of this document are made with an entry class based on function in
242 a broad sense. This is in accordance with ISO 22274:2013, 5.4.4 which recommends a
243 combination of an enumerative and faceted classification system with an entry class.
244 When a class code is applied in a reference designation, the purpose is to classify the
245 occurrence of the object, not the individual, as described in IEC 81346-1:2022, 4.9 and Table 1.
246 In such a situation, the object is generally specified and assigned its inherent function in the
247 design stage of the project. Classes can also be used by manufacturers to show multiple
248 potential use of a product. In this way, the classification can enhance searchability.
249 The class name (preferred term) assigned to the classes and the examples of terms provided
250 in this document are based on the inherent function of an object, i.e. independent of any
251 application.
252 This classification scheme ensures a life cycle stable class code, as the object occurrence is
253 classified by its stable inherent function; a stake is a stake, a door is a door and so on, no
254 matter what individual is used to realize the occurrence.
255 Objects related to a class can be considered as a discrete collection of objects and can
256 therefore be further classified into sub-classes based on the differentiation of a specific
257 characteristic. In this document, this has resulted in a classification scheme starting with
st
258 classes representing general types based on function in a broad sense (1 letter code),
259 continuing into classes representing types that are more specialized in two steps, represented
nd rd
260 by 2 and 3 letter in the class code.
261 All examples and terms in the classification schemes of this document are recognized as being
262 used to name a member of their class. As different branches have different usage of
263 terminology, the same example or term can occur in different classes.
264 4.2 Relation between classification and composition
265 IEC 81346-1 defines rules on how a complex object can be structured into its constituent objects
266 resulting in a composition hierarchy. For the purpose of classifying objects, this document
267 defines classes and codes that result in a classification hierarchy, see Figure 1, which is a copy
268 of Figure 2 in 4.2 of ISO 12006-2:2015.
Classification hierarchy Composition hierarchy
Subclasses are types of a superordinate class. Subordinates are parts of a superordinate whole.
element insulation
Class Whole Wall system Ventilation system
Subclass wall roof floor wall batts duct insulation Part
Stud Insulation Plate
Fan Insulation Ventilator
270 Figure 1 – Illustration of a classification hierarchy and a composition hierarchy
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271 4.3 Classification schemes of this document
272 This document provides different classification schemes of objects primarily intended for use in
273 reference designations, based on the basic requirements given in Annex C. The provided
274 classification schemes are:
275 • inherent function of objects, see clause 5;
276 • construction complexes, see clause 6.2;
277 • construction entities, see clause 6.3;
278 • spaces, see clause 7.
279 The content of any class is determined by the definition of the class only. A preferred term
280 determines the class in daily use and forms part of the definition of subclasses. The
281 classification tables of this document are considered to be complete, and therefore no
282 “miscellaneous” or “other” classes are present. If no appropriate class for an object -of-interest
283 can be found as a sub-class or sub-sub-class, objects shall be classified to the higher class
284 level i.e. to the sub-class or entry class.
285 This document provides classification schemes with multiple classification levels. The user can
286 choose to apply letter codes using:
287 – a single letter, representing the entry class; or
288 – two letter code, representing a sub-class in the scheme; or
289 – three letter code, representing a sub-sub-class in the scheme.
290 NOTE Requirements for the application of letter codes within a reference designation are provided in IEC 81346 -
291 1:2022, 6.2.3.
292 5 Classification scheme for the inherent function of objects
293 5.1 General
294 The classification scheme defined in this clause has a hierarchical classification structure that
295 constitute three levels from top to lower.
296 The entry classes defined are based on the inherent function of objects. It is the intention that
297 the entry-classes are distinct; thus, they should not have overlapping definitions. The
298 classification scheme is also intended to be complete in the sense that no miscellaneous
299 classes are defined.
300 For defining sub-classes of a class (i.e. parent-class), different facets, i.e. criteria, are used,
301 see Annex A. Only one, or a predefined set of criteria are used for defining all the sub-classes
302 of a parent-class.
303 The criteria used for defining sub-classes are provided for each parent-class as shown in Table
304 1 and Table 2.
305 The entry classes and their respective subclasses are defined based on the knowledge of the
306 use of objects in existing designs, and the classification schemes defined in IEC 81346 -2:2009,
307 and are updated in relation to the schemes defined in IEC 81346-2:2019
308 NOTE 1 Different kinds of classification schemes are described in ISO 22274.
309 NOTE 2 When the classification scheme shown in Table 1 and Table 2 refer to high-voltage or low-voltage, high-
310 voltage is considered to be any voltage > 1 000 V AC or > 1 500 V DC. Low-voltage is considered to be any voltage
311 1 000 V AC or 1 500 V DC. These voltage limits are in accordance with IEC 61140.
IEC CDV 81346-2 © IEC 2025
312 Table 1 defines the entry classes for the classification scheme for inherent function of objects.
313 Table 1 – Entry classes for inherent function
Class code Class definition Class name
B object for picking up information and providing a sensing object
representation
C object for storing for subsequent retrieval storing object
E object for emitting emitting object
F object for protecting against the effects of dangerous protecting object
or undesirable conditions
G object for providing a controllable flow generating object
H object for treating matter matter processing object
K object for treating input signals and providing an information processing object
appropriate output
M object for providing mechanical movement or force driving object
N object for enclosing partly or fully another object covering object
P object for providing perceptible information presenting object
Q object for controlling access or flow controlling object
R object for restricting or stabilising restricting object
S object for detecting a user action and providing an user interaction object
appropriate response
T object for transforming transforming object
U object for localising of other objects holding object
W object for leading from one place to another guiding object
X object for interfacing an object interfacing object
The letters A, I and O shall not be used as a class code.
The letters D, J, L, V, Y and Z are reserved for future standardization.
315 Each class defined in Table 1 is in this document associated with a set of predefined subclasses
316 allowing a more detailed characterization of an object, if required. The definitions of subclasses
317 of objects (sub-class and sub-sub-class) are presented in Table 2 together with their associated
318 letter codes.
319 NOTE Subclasses do not define a new level in a composition structure, i.e. they do not describe a subdivision of
320 the object. Class and subclass refer to the same object.
321 Annex B illustrates how the classes in Table 1 relate to a generic process.
IEC CDV 81346-2 © IEC 2025
322 5.2 Complete classification scheme
323 Table 2 shows the classification scheme for objects where the entry-classes are based on the
324 inherent function of objects.
325 Numerals below class code in the table header in Table 2 show the level in the classification
326 structure, that is, level 1, 2 and 3 mean entry class, sub-class and sub-sub-class respectively,
327 see Annex A.
328 In Table 2, classes that are considered to be obsolete, i.e. classes that no longer should be
329 used, are indicated using a grey scale font.
330 Table 2 – Complete classification scheme for inherent function of objects
Class code Criteria for
Class name
Class definition Examples of terms definition of
(preferred term)
1 2 3
subclasses
B object for picking up sensing object Kind of
information and providing quantity
a representation
BA sensing object for electric electric potential Kind of output
potential sensing object signal
BAA electric potential sensing voltage sensor coupling capacitor,
object, with scalar output measuring voltage
transformer, voltage
transformer
BAB electric potential sensing voltage detector measuring voltage relay,
object, with Boolean voltage relay
output
BB sensing object for resistivity Kind of flow
resistivity or conductivity sensing object and output
signal
BBA resistivity sensing object electric resistivity
for electric current flow, sensor
with scalar output
BBB resistivity sensing object electric resistivity
for electric current flow, detector
with Boolean output
BBC resistivity sensing object thermal
for thermal flow, with resistivity sensor
scalar output
resistivity sensing object thermal
BBD
for thermal flow, with resistivity
Boolean output detector
sensing object for electric electric current Kind of output
BC
current sensing object signal
BCA electric current sensing current sensor current transformer,
object, with scalar output measuring current
transformer, optical
current sensor
BCB electric current sensing current detector current relay, electronic
object, with Boolean overload relay,
output measuring current relay,
overload relay
BD sensing object for density density sensing Kind of output
object signal
BDA density sensing object, density sensor aerometer, density
with scalar output transmitter, hydrometer
BDB density sensing object, density detector density switch
with Boolean output
IEC CDV 81346-2 © IEC 2025
Criteria for
Class code
Class name
Class definition Examples of terms definition of
(preferred term)
1 2 3
subclasses
BE sensing object for field field sensing Kind of output
object signal
BEA field sensing object for electric field
electric field, with scalar sensor
output
BEB field sensing object for electric field
electric field, with detector
Boolean output
BEC field sensing object for magnetic field
magnetic field, with scalar sensor
output
BED field sensing object for magnetic field reed relay, reed switch
magnetic field, with detector
Boolean output
BF sensing object for flow flow sensing Kind of output
object signal
BFA flow sensing object, with flow sensor flow transmitter, gas
scalar output flow sensor, liquid flow
sensor, matter flow
sensor, water flow
sensor
BFB flow sensing object, with flow detector flow switch, gas flow
Boolean output switch, matter flow
switch
BG sensing object of spatial physical Kind being
dimension or position dimension sensed and
sensing object kind of output
signal
BGA physical dimension position sensor position transmitter,
sensing object of position, presence locator, radar
with scalar output
BGB physical dimension position detector movement detector,
sensing object of position, movement sensor (PIR),
with Boolean output position switch,
presence indicator
BGC physical dimension distance sensor distance transmitter,
sensing object of length, laser distance
with scalar output transmitter, position
sensor, visibility sensor
BGD physical dimension distance detector laser distance sensing
sensing object of length, switch, laser distance
with Boolean output switch, movement
detector, movement
sensor (PIR), position
switch, presence
indicator, visibility
detector
BGE physical dimension angle sensor alignment transmitter,
sensing object of angle or end stop, position
direction, with scalar sensor, position
output transmitter, rotary
encoder, wind direction
indicator
BGF physical dimension angle detector alignment threshold
sensing object of angle or detector, angle switch,
direction, with Boolean movement detector,
output movement sensor (PIR),
position sensor,
presence indicator,
radar
IEC CDV 81346-2 © IEC 2025
Criteria for
Class code
Class name
Class definition Examples of terms definition of
(preferred term)
1 2 3
subclasses
BGG physical dimension object scanner 2D-scanner,
sensing object of physical 3D-scanner, coordinates
object scanner, laser scanner
BH sensing object for energy energy sensing Kind of energy
object
BHA energy sensing object of flow energy energy cooling meter,
flow with defined energy meter energy meter, energy
density sensor, gas energy
meter
BHB energy sensing object of thermal energy condensate sensor,
thermal flow with defined meter energy cooling meter,
heat capacity energy meter, energy
sensor
BHC energy sensing object of electric energy kWh sensor
electricity flow meter
BJ sensing object for power power sensing Kind of output
object signal
BJA power sensing object, power sensor kW meter, power meter
with scalar output
BJB power sensing object, power detector power limit switch
with Boolean output
BK sensing object for time time sensing Kind of output
object signal
BKA time sensing object, with time sensor clock, time information
scalar output device
BKB time sensing object, with timer detector time counter, timer
Boolean output switch
BL sensing object for level level sensing Kind of output
object signal
BLA level sensing object, with level sensor level transmitter, liquid
scalar output level sensor
BLB level sensing object, with level detector level switch, liquid level
Boolean output switch
BM sensing object for humidity sensing Kind of output
humidity object signal
BMA humidity sensing object humidity sensor humidity transmitter
with scalar output
BMB humidity sensing object, humidity detector humidity switch
with Boolean output
BP sensing object for pressure sensing Kind of output
pressure object signal
BPA pressure sensing object absolute absolute pressure
for absolute pressure pressure sensor transmitter, manometer,
sensing, with scalar pressure monitor,
output pressure sensor,
pressure transducer
BPB pressure sensing object absolute absolute pressure
for absolute pressure pressure detector switch, pressure switch
sensing, with Boolean
output
BPC pressure sensing object differential differential pressure
for differential pressure pressure sensor transmitter, pressure
sensing, with scalar sensor
output
BPD pressure sensing object differential differential pressure
for differential pressure pressure detector switch, pressure sensor,
sensing, with Boolean pressure switch
output
IEC CDV 81346-2 © IEC 2025
Criteria for
Class code
Class name
Class definition Examples of terms definition of
(preferred term)
1 2 3
subclasses
BPE pressure sensing object relative pressure relative pressure
for relative pressure sensor transmitter
sensing, with scalar
output
BPF pressure sensing object relative pressure relative pressure switch
for relative pressure detector
sensing, with Boolean
output
BQ sensing object for concentration Kind of object
substance concentration sensing object and kind of
output signal
BQA concentration sensing gas sensor CO concentration
object of gas, with scalar sensor, CO2
output concentration sensor,
concentration sensor,
NH concentration
sensor
BQB concentration sensing gas detector concentration detection
object of gas, with switch
Boolean output
BQC concentration sensing liquid sensor concentration sensor,
object liquid with, scalar fog sensor, petrol
output concentration sensor,
visibility sensor
BQD concentration sensing liquid detector concentration detection
object of liquid, with switch, fog detector,
Boolean output visibility detector
concentration sensing solid matter concentration sensor,
BQE
object of solid matter, sensor smoke sensor, turbidity
with scalar output sensor, visibility sensor
BQF concentration sensing solid matter concentration detection
object of solid matter, detector switch, smoke detector,
with Boolean output smoke switch, turbidity
detector, visibility
detector
BR sensing object for radiation sensing Kind of
radiation object radiation and
kind of output
signal
BRA radiation sensing object light sensor
of visible electromagnetic
waves, with scalar output
BRB radiation sensing object light detector light curtain, light
of visible electromagnetic transmitter, line
waves, with Boolean detector, low-light
output relays, lux sensor,
photocell
BRC radiation sensing object electromagnetic gamma-radiation
for non-visible wave sensor detector,
electromagnetic waves, IR-sensor, radar-sensor,
with scalar output UV-sensor
BRD radiation sensing object electromagnetic
for non-visible wave detector
electromagnetic waves,
with Boolean output
BRE radiation sensing object radiation sensor alpha-particle sensor
of nuclear particles, with (helium nucleus), beta-
scalar output particle sensor (electron
nucleus), Geiger meter,
neutron-particle sensor,
radiation counter
IEC CDV 81346-2 © IEC 2025
Criteria for
Class code
Class name
Class definition Examples of terms definition of
(preferred term)
1 2 3
subclasses
BRF radiation sensing object radiation detector
of nuclear particles, with
Boolean output
BS sensing object for time- time-rating object Kind of time
rate object sensed
and kind of
output signal
BSA time-rating object of non- cycle rate sensor cycle rate transmitter,
rotational cycles, with frequency transmitter
scalar output
BSB time-rating object of non- cycle rate cycle rate detecting
rotational cycles, with detecting switch
Boolean output detector
BSC time-rating object of speed sensor movement transmitter,
distance, with scalar speed sensing
output transmitter
BSD time-rating object of speed detector movement detector,
distance, with Boolean
speed detecting switch
output
BSE time-rating object of rotation speed tachometer
rotation, with scalar sensor
output
BSF time-rating object of rotation speed rotation speed relay
rotation, with Boolean detector
output
BSG time-rating object of accelerometer accelerometer
speed, with scalar output sensor transmitter, seismic
sensor
BSH time-rating object of accelerometer accelerometer relay,
speed, with Boolean detector seismic switch, shake
output switch
BT sensing object for temperature Kind of output
temperature sensing object signal
BTA temperature sensing temperature temperature transmitter
object, with scalar output sensor
BTB temperature sensing temperature fire thermostat,
object, with Boolean detector temperature switch
output
BU sensing object for multiple multi-quantity Kind of output
quantities sensing object signal
BUA multi-quantity sensing multi-sensor dew point sensor,
object, with scalar multimeter
output(s)
BUB multi-quantity sensing multi-detector Buchholz relay,
object, with Boolean differential relay,
output(s) distance protection
relay, impedance
protection relay,
negative phase-
sequence relay
BW sensing object for weight, force sensing Kind of object
force or torque object sensed and
kind of output
signal
BWA force sensing object of weight sensor load cell, weight
weight, with scalar output transmitter
BWB force sensing object of weight detector weight detecting switch
weight, with Boolean
output
IEC CDV 81346-2 © IEC 2025
Criteria for
Class code
Class name
Class definition Examples of terms definition of
(preferred term)
1 2 3
subclasses
BWC force sensing object of force value force transmitter
force, with scalar output sensor
BWD force sensing object of force detector force detecting switch
force, with Boolean output
BWE force sensing object of torque sensor torque transmitter,
torque, with scalar output torque value transmitter
BWF force sensing object of torque detector torque switch
torque, with Boolean
output
BX sensing object of sound audio-visual Kind of output
or visual appearance sensing object signal
BXA audio-visual sensing acoustic sensor acoustic survey device,
object of sound, with microphone
scalar output
BXB audio-visual sensing acoustic detector glass breakage detector
object of sound, with
Boolean output
BXC audio-visual sensing image sensor camera, CCTV, PTZ
object of visual camera, scanner
appearance, with scalar
output
BXD audio-visual sensing image detector face recognition device,
object of visual finger-print reader, iris
appearance, with Boolean reader
output
BXE audio-visual sensing video camera
object of sound and visual
appearance, with scalar
output
BY sensing object of stored information Kind of
information sensing object method
BYA Information sensing chip reader chip card reader
object by electrical
connection
BYB Information sensing electromagnetic magnetic stripe reader,
object by electromagnetic reader RFC reader, RFID
fie
...
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