SIST EN IEC 62828-2:2026

• Abstract:

  This part of IEC 62828 establishes specific procedures for testing pressure process measurement transmitters (PMT) used in measuring and control systems for industrial processes and for machinery.; A pressure PMT can feature a remote seal to bring the process variable to the sensing element in the PMT. When the remote seal cannot be separated from the PMT, the complete device is tested.; For general test procedures, reference is made to IEC 62828-1, which is applicable to all types of process measurement transmitters.; NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also to use the terms "industrial transmitters", or "process transmitters".

• Status: Published
• Public Enquiry End Date: 26-May-2024
• Publication Date: 12-Oct-2026
• ICS: 17.100 - Measurement of force, weight and pressure
• ICS: 25.040.40 - Industrial process measurement and control
• Technical Committee: MOV - Measuring equipment for electromagnetic quantities
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 18-Aug-2026
• Due Date: 23-Oct-2026
• Completion Date: 13-Oct-2026
• Ref Project: EN IEC 62828-2:2026 - Reference conditions and procedures for testing industrial and process measurement transmitters - Part 2: Specific procedures for pressure transmitters

• Refers: SIST EN IEC 62828-1:2026 - Reference conditions and procedures for testing industrial and process measurement transmitters - Part 1: General procedures for all types of transmitters (IEC 62828-1:2026)
• Effective Date: 07-Jul-2026
• Refers: SIST EN 61518:2002 - Mating dimensions between differential pressure (type) measuring instruments and flanged-on shut-off devices up to 413 bar (41,3 MPa)
• Effective Date: 07-Jul-2026
• Revises: SIST EN IEC 62828-2:2018 - Reference conditions and procedures for testing industrial and process measurement transmitters - Part 2: Specific procedures for pressure transmitters (IEC 62828-2:2017)
• Effective Date: 18-Jul-2023

SIST EN IEC 62828-2:2026 is the CLC/IEC standard for testing pressure process measurement transmitters (PMT) used in industrial processes and machinery. It specifies pressure-specific reference test conditions and test procedures, and it is intended to be used together with IEC 62828-1 for the general rules. In practice, it tells manufacturers, test laboratories, and users how to check accuracy, overpressure behaviour, static pressure influence, drift, leakage, and diaphragm/remote seal effects.

What does SIST EN IEC 62828-2:2026 specify?

SIST EN IEC 62828-2:2026 establishes specific procedures for testing pressure PMT used in measuring and control systems for industrial processes and machinery. It also covers the case where a pressure PMT uses a remote seal, and it says the complete device is tested when the remote seal cannot be separated.

The standard is organized as a short technical document with general clauses and two informative annexes.

Annex	What it covers
Annex A	Relationship between the SI unit for pressure and other pressure-related units
Annex B	Pressure PMT description and typical PMT configurations

The body of the standard is structured around scope, normative references, terms and definitions, general description, reference test conditions, test procedures, and test report / technical documentation. That structure matters because the document is not only about one test - it gives a complete test workflow from setup to reporting.

What are the key requirements of SIST EN IEC 62828-2:2026?

SIST EN IEC 62828-2:2026 focuses on a small set of pressure-specific checks that matter in calibration, type testing, acceptance testing, and routine testing. The most important point is that it adds pressure transmitter procedures on top of the general rules in IEC 62828-1.

Reference conditions and test setup

SIST EN IEC 62828-2:2026 applies the reference test conditions in IEC 62828-1 for both standard reference test conditions and operating reference test conditions. For test setup, the document allows the pressure source and the standard pressure measuring instrument to be the same device, such as a pressure calibrator or dead weight calibrator.

That matters in practice because a lab can use a realistic calibration chain, but must still control the power supply and output signal arrangement. The document also notes that analogue and digital outputs are mutually exclusive unless a mixed-mode protocol is used.

Accuracy test

SIST EN IEC 62828-2:2026 requires an input-output accuracy test over the full range in one measurement cycle, traversing the range up and down. At least five evenly distributed points are to be measured, including points near 0 % and 100 % of span.

The results are recorded as measured errors, shown in a table and plotted graphically. For differential pressure PMT, the cycle is repeated for the positive and negative sides, and the transmitter output range may need configuration so the whole pressure range can be covered. In practice, this is the core routine or acceptance check for how the transmitter behaves across its measuring span.

Overpressure behaviour

SIST EN IEC 62828-2:2026 covers overpressure for gauge pressure and absolute pressure PMT by checking residual changes in lower range limit and span after over-ranging the input. For differential pressure PMT, it adds further tests for bilateral overpressure and alternating unilateral or bilateral overpressure.

This matters because overload exposure can change zero and span even if the transmitter survives mechanically. The standard therefore asks the tester to record the residual error after the overload and to document any restrictions after return from overload range.

Static pressure influence

SIST EN IEC 62828-2:2026 requires differential pressure PMT to be tested for the influence of static pressure on zero and span. The procedure measures output change as static pressure is stepped between atmospheric pressure and the maximum working static pressure, while the differential input is kept constant.

This is important for transmitters used with line pressure, because static pressure can shift the zero reading or the span even when the measured differential pressure stays the same. If the span cannot be measured in a particular case, the document allows zero influence alone to be reported, with the reason stated in the test report.

Long-term drift

SIST EN IEC 62828-2:2026 includes 30-day long-term drift tests. The transmitter is held at steady input and readings are recorded repeatedly, preferably daily or more often, while environmental effects are controlled so they do not hide the drift.

For gauge pressure PMT and differential pressure PMT, the document gives specific operating conditions for the steady input and the recording method. In practice, this is the main stability check for users who need the transmitter to hold calibration over time.

Leakage and diaphragm/remote seal behaviour

SIST EN IEC 62828-2:2026 requires a leakage test for mounted sealing connections at a pressure corresponding to the overpressure limit declared by the manufacturer. The leakage method follows EN 12266-1, and the measured leakage must stay within the declared specification.

For diaphragm/remote seals, the standard adds a 30-day long-term test for the influence of process temperature. This matters because the fill fluid and seal arrangement can add drift that is separate from the transmitter body itself.

Technical documentation and total probable error

SIST EN IEC 62828-2:2026 requires technical documentation to include accuracy or measurement error, non-linearity, hysteresis, non-repeatability, long-term stability, ambient temperature influence, static pressure influence, overpressure influence, and leakage rate. It also describes total probable error as a root-sum-square style evaluation of the main error contributions.

That helps buyers and users compare transmitters on a like-for-like basis. For remote seal applications, the document notes that the seal contribution is usually kept separate from the transmitter contribution.

What terms does SIST EN IEC 62828-2:2026 define?

SIST EN IEC 62828-2:2026 defines the pressure vocabulary used throughout the test procedures, so the same transmitter characteristics are measured and reported consistently.

• Pressure PMT - a pressure process measurement transmitter used in industrial processes or machinery.
• Maximum Working Pressure (MWP) - the highest pressure the device can be continuously exposed to in operation.
• Overpressure limit (OPL) - the temporary pressure level the device may withstand without permanent damage and without change in guaranteed metrological properties after return to range.
• Static pressure / line pressure - pressure applied on both sides of a differential pressure PMT, acting as an influence factor rather than the measurand.
• Set span - the pressure difference between the upper and lower range values to which the instrument is adjusted.
• Diaphragm seal / remote seal - a component that transfers pressure to the PMT by hydraulic path and reduces influence from the process.
• Burst pressure - the maximum pressure that can be applied without physically damaging the sensing component.
• Variable scale pressure transmitter - a transmitter with an adjustable measuring range.

Who uses SIST EN IEC 62828-2:2026?

SIST EN IEC 62828-2:2026 is used by manufacturers of pressure PMT, test and calibration laboratories, and users of industrial process and machinery measurement systems. It is also relevant to engineers preparing technical documentation and to anyone defining acceptance or routine tests for pressure transmitters.

In practice, these users apply it to verify performance, compare transmitter options, and document test results in a consistent way.

What changed in SIST EN IEC 62828-2:2026 from the previous edition?

SIST EN IEC 62828-2:2026 is identified as the second edition in the IEC 62828-2 project. The publication record shown with the document cites IEC 62828-2 Ed.2 and notes that it supersedes document 65B/1240/RR.

Which standards are used with SIST EN IEC 62828-2:2026?

SIST EN IEC 62828-2:2026 is used together with these standards and companion documents:

• IEC 62828-1 - provides the general procedures for all types of transmitters, including the common reference test conditions and general test framework.
• IEC 61518:2000 - gives mating dimensions for differential pressure measuring instruments and flanged-on shut-off devices, which supports the physical connection used in some differential pressure PMT applications.
• EN 12266-1 - provides the test procedure and acceptance criteria used for the leakage test of mounted sealing connections.

The introduction also places SIST EN IEC 62828-2:2026 in the IEC 62828 series, alongside parts for temperature, level, and flow transmitters.

What does the SIST EN IEC 62828-2:2026 document contain?

SIST EN IEC 62828-2:2026 contains the procedure descriptions, test setup diagrams, and reporting guidance needed to evaluate pressure PMT. It includes a full accuracy test cycle, overpressure procedures, static pressure procedures, long-term drift methods, leakage testing, and an additional long-term temperature test for diaphragm/remote seals.

The document also contains Figure 1 for measuring range terms, Figure 2 for a pressure PMT test setup, Figures 4 to 7 for overpressure and static pressure procedures, Table 1 for example measured errors, Annex A for unit relationships, and Annex B for pressure PMT descriptions and a typical intelligent PMT model.

SLOVENSKI STANDARD
01-november-2026
Referenčni pogoji in postopki za preskušanje industrijskih in procesnih merilnih
oddajnikov - 2. del: Posebni postopki za dajalnike tlaka (IEC 62828-2:2026)
Reference conditions and procedures for testing industrial and process measurement
transmitters - Part 2: Specific procedures for pressure transmitters (IEC 62828-2:2026)
Referenzbedingungen und Testmethoden für Industrie- und
Prozessmessgrößenumformer - Teil 2: Spezielle Testmethoden für Druckmessumformer
(IEC 62828-2:2026)
Conditions de réference et procédures pour l'essai des transmetteurs de mesure
industrielle et de processus - Partie 2: Procédures spécifiques pour les transmetteurs de
pression (IEC 62828-2:2026)
Ta slovenski standard je istoveten z: EN IEC 62828-2:2026
ICS:
17.100 Merjenje sile, teže in tlaka Measurement of force,
weight and pressure
25.040.40 Merjenje in krmiljenje Industrial process
industrijskih postopkov measurement and control
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62828-2

NORME EUROPÉENNE
EUROPÄISCHE NORM August 2026
ICS 17.100; 25.040.40 Supersedes EN IEC 62828-2:2018
English Version
Reference conditions and procedures for testing industrial and
process measurement transmitters - Part 2: Specific procedures
for pressure transmitters
(IEC 62828-2:2026)
Conditions de référence et procédures pour l'essai des Referenzbedingungen und Testmethoden für Industrie- und
transmetteurs de mesure industrielle et de processus - Prozessmessgrößenumformer - Teil 2: Spezielle
Partie 2: Procédures spécifiques pour les transmetteurs de Testmethoden für Druckmessumformer
pression (IEC 62828-2:2026)
(IEC 62828-2:2026)
This European Standard was approved by CENELEC on 2026-07-16. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62828-2:2026 E

European foreword
The text of document 65B/1308/FDIS, future edition 2 of IEC 62828-2, prepared by SC 65B
"Measurement and control devices" of IEC/TC 65 "Industrial-process measurement, control and
automation" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2027-08-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2029-08-31
document have to be withdrawn
This document supersedes EN IEC 62828-2:2018 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document is read in conjunction with EN IEC 62828-1:2026.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62828-2:2026 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC 61010-1:2010 NOTE Approved as EN 61010-1:2010 (not modified)
IEC 61987-13 NOTE Approved as EN 61987-13
IEC 62828 (series) NOTE Approved as EN IEC 62828 (series)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 62828-1 2026 Reference conditions and procedures for - -
testing industrial and process
measurement transmitters - Part 1:
General procedures for all types of
transmitters
IEC 61518 - Mating dimensions between differential EN 61518 -
pressure (type) measuring instruments and
flanged-on shut-off devices up to 413 BAR
(41,3 MPa)
IEC 62828-2 ®
Edition 2.0 2026-06
INTERNATIONAL
STANDARD
Reference conditions and procedures for testing industrial and process
measurement transmitters -
Part 2: Specific procedures for pressure transmitters
ICS 17.100; 25.040.40 ISBN 978-2-8327-1268-9

IEC 62828-2:2026-06(en)
IEC 62828-2:2026 © IEC 2026
CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General description of the device and overview . 9
5 Reference test conditions . 9
6 Test procedures . 10
6.1 General . 10
6.2 Tests at standard and operating reference test conditions . 10
6.2.1 General . 10
6.2.2 Accuracy test suitable for routine and acceptance tests . 11
6.2.3 Influence of the overpressure . 12
6.2.4 Influence of static pressure . 14
6.2.5 Long-term drift . 16
6.2.6 Leakage test . 17
6.2.7 Additional tests for diaphragm/remote seals – Influence of process
temperature (long term) . 18
6.2.8 Additional tests – Burst pressure . 18
7 Test report and technical documentation . 18
7.1 General . 18
7.2 Total probable error . 18
Annex A (informative) Relationship between the SI unit and other pressure related
units . 20
Annex B (informative) Pressure process measurement transmitter (PMT) . 21
B.1 General description of a pressure PMT . 21
B.2 Typical PMTs . 21
Annex C (informative)  Main characteristics for pressure transmitters . 23
Bibliography . 26

Figure 1 – Measuring range and associated properties of a pressure PMT . 7
Figure 2 – Schematic example of a test set-up for pressure PMT . 10
Figure 3 – Example of measured error plot . 12
Figure 4 – Procedure for the determination of the unilateral overpressure error . 13
Figure 5 – Schematic example of test set-up for determining the effect of the static
pressure . 14
Figure 6 – Procedure for the determination of the zero point error with static pressure . 15
Figure 7 – Procedure for the determination of the span error for static pressure . 16
Figure B.1 – Schematic example of intelligent PMT model . 22

Table 1 – Example of measured errors with 20 % steps . 11
Table A.1 – Relationship between the SI unit and other pressure related units . 20
Table C.1 – Pressure-based transmitters . 23

IEC 62828-2:2026 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Reference conditions and procedures for testing industrial and process
measurement transmitters -
Part 2: Specific procedures for pressure transmitters

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 62828-2 has been prepared by subcommittee 65B: Measurement and control devices, of
IEC technical committee 65: Industrial-process measurement, control and automation. It is an
International Standard.
This second edition cancels and replaces the first edition published in 2017. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) revision according to the latest IEC rules;
b) comparison with the general part of IEC 62828-1;
c) additions and more precise definitions in the "Terms and definitions" clause;
d) correction of the calculation formulas for the measurement error;
IEC 62828-2:2026 © IEC 2026
e) more precise formulation of long-term drift;
f) extension of additional tests;
g) transfer of the annex "Example of signal current range for a 4 to 20 mA PMT" in
IEC 62828-1;
h) new Annex C "Main characteristics for pressure transmitters".
The text of this International Standard is based on the following documents:
Draft Report on voting
65B/1308/FDIS 65B/1319/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This International Standard is to be used in conjunction with IEC 62828-1:2026.
A list of all parts in the IEC 62828 series, published under the general title Reference conditions
and procedures for testing industrial and process measurement transmitters, can be found on
the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
IEC 62828-2:2026 © IEC 2026
INTRODUCTION
Most of the current IEC standards on industrial and process measurement transmitters are
rather old and were developed having in mind devices based on analogue technologies. Today's
digital industrial and process measurement transmitters are quite different from those analogue
transmitters: they include more functions and newer interfaces, both towards the computing
section (mostly digital electronic) and towards the measuring section (mostly mechanical). Even
if some standards dealing with digital process measurement transmitters already exist, they are
not sufficient, since some aspects of the performance are not covered by appropriate test
methods.
In addition, existing IEC test standards for industrial and process measurement transmitters are
spread over many documents, so that for manufacturers and users it is difficult, impractical and
time-consuming to identify and select all the standards to be applied to a device measuring a
specific process quantity (pressure, temperature, flow, level, etc.).
To help manufacturers and users, it was decided to review, complete and reorganize the
relevant IEC standards and to create a more suitable, effective and comprehensive standard
series that provides in a systematic way all the necessary specifications and tests required for
different industrial and process measurement transmitters.
To solve the issues mentioned above and to provide an added value for the stakeholders, the
new standard series on industrial and process measurement transmitters covers the following
main aspects:
– applicable normative references;
– specific terms and definitions;
– typical configurations and architectures for the various types of industrial and process
measurement transmitters;
– hardware and software aspects;
– interfaces (to the process, to the operator, to the other measurement and control devices);
– physical, mechanical and electrical requirements and relevant tests; clear definition of the
test categories: type tests, acceptance tests and routine tests;
– performance (its specification, tests and verification);
– environmental protection, hazardous areas application, functional safety, etc.;
– structure of the technical documentation.
To cover in a systematic way all the topics to be addressed, the IEC 62828 series is organized
in several parts. At the moment of the publication of this document, the IEC 62828 series consist
of the following parts:
– IEC 62828-1: General procedures for all types of transmitters;
– IEC 62828-2: Specific procedures for pressure transmitters;
– IEC 62828-3: Specific procedures for temperature transmitters;
– IEC 62828-4: Specific procedures for level transmitters;
– IEC 62828-5: Specific procedures for flow transmitters.

IEC 62828-2:2026 © IEC 2026
1 Scope
This part of IEC 62828 establishes specific procedures for testing pressure process
measurement transmitters (PMT) used in measuring and control systems for industrial
processes and for machinery.
A pressure PMT can feature a remote seal to bring the process variable to the sensing element
in the PMT. When the remote seal cannot be separated from the PMT, the complete device is
tested.
For general test procedures, reference is made to IEC 62828-1, which is applicable to all types
of process measurement transmitters.
NOTE In industrial and process applications, to indicate the process measurement transmitters, it is common also
to use the terms "industrial transmitters", or "process transmitters".
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.
IEC 62828-1:2026, Reference conditions and procedures for testing industrial and process
measurement transmitters - Part 1: General procedures for all types of transmitters
IEC 61518, Mating dimensions between differential pressure (type) measuring instruments and
flanged-on shut-off devices up to 413 bar (41,3 MPa)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62828-1 and in
IEC 61518 as well as the following apply.
ISO and IEC maintain terminology 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
absolute pressure
p
abs
pressure using absolute vacuum as the datum point
[SOURCE: IEC 61987 #ABB181 in the IEC common data dictionary]
3.2
ambient atmospheric pressure
p
amb
pressure exerted by the atmospheric air at a given altitude and temperature
Note 1 to entry: The atmospheric pressure decreases with the altitude by about 10 Pa/m (Pascal per meter).
IEC 62828-2:2026 © IEC 2026
3.3
differential pressure
∆p
p
1,2
difference between the two (absolute) pressures that act simultaneously on opposite sides of a
membrane or a primary element
[SOURCE: IEC 61987 #ABB995 in the IEC common data dictionary]
3.4
gauge pressure
p
g
pressure using atmospheric pressure as the datum point

p = p –p
g abs amb
Note 1 to entry: Gauge pressure assumes positive values when the absolute pressure is greater than the ambient
atmospheric pressure; it assumes negative values when the absolute pressure is less than the ambient atmospheric
pressure.
Note 2 to entry: In certain industrial environments, "gauge pressure" can be referred to as "pressure".
Note 3 to entry: The term "relative pressure" to indicate gauge pressure is obsolete and conceptually wrong, so it
should be avoided.
[SOURCE: IEC 61987 #ABB182 in the IEC common data dictionary]
3.5
line pressure
static pressure
pressure applied on both sides of a differential pressure PMT
Note 1 to entry: For differential pressure PMTs, it is an influence factor that is bilateral and does not represent the
measurand.
3.6
leakage rate
leakage, permeation and/or diffusion effects of the medium through the PMT and/or its mounting
devices over the testing period under static pressure conditions, expressed as normal volume
flow rate
[SOURCE: IEC 61987 #ABD632 in the IEC common data dictionary]
IEC 62828-2:2026 © IEC 2026
3.7
measuring range
range related to the measurement of absolute and gauge pressure PMTs
Note 1 to entry: For a pressure PMT with variable (adjustable or programmable) span, the measuring range and
associated terms are shown in Figure 1.
Note 2 to entry: See also Annex G in IEC 62828-1:2026 for an example of signal current range of a 4 mA to 20 mA
PMT.
Note 3 to entry: The maximum span indicates the measuring range defined by the difference between the upper
and lower range limit.
Figure 1 – Measuring range and associated properties of a pressure PMT
3.8
set span
difference between the upper and lower range value of pressure to which a pressure
measurement instrument is adjusted
[SOURCE: IEC 61987 #ABB570 in the IEC common data dictionary]
3.9
Maximum Working Pressure
MWP
highest pressure a device can be continuously exposed to during operation
Note 1 to entry: Maximum Working Pressure (MWP) is equal to the upper range limit (URL), if not otherwise
specified in the product documentation.
3.10
overpressure limit
OPL
proof pressure
multiple of Maximum Working Pressure with which the device can be temporarily subjected to
pressure without permanent damage and without change of the guaranteed metrological
properties after returning to the measuring range
Note 1 to entry: The output signal at the overpressure limit is sometimes unreliable and/or not predictable.
Note 2 to entry: After returning to the measuring range, the guaranteed metrological properties shall remain
unchanged.
[SOURCE: IEC 61987 #ABC027 in the IEC common data dictionary]
IEC 62828-2:2026 © IEC 2026
3.11
minimum pressure limit
pressure at which the device is permitted to be subjected without permanent damage and
without change of the guaranteed metrological properties after returning to the measuring range
3.12
pressure
force per unit area applied in a direction perpendicular to a surface
Note 1 to entry: The SI unit for pressure is the Pascal (Pa), equal to one Newton per square metre (N/m or
-1 -2
kg m s ).
Note 2 to entry: In Annex A, a table shows the relationship between the SI unit and other units, often used for process
measurement transmitter applications.
Note 3 to entry: For the purpose of this document, a simplified definition could be accepted as follows: Ratio of
orthogonal component of the force per unit area.
3.13
fixed scale pressure transmitter
pressure transmitter with fixed measuring range set by the manufacturer
3.14
variable scale pressure transmitter
pressure transmitter with an adjustable measuring range (turndown ratio)
3.15
burst pressure
maximum pressure that can be applied to the instrument without physically damaging the
internal sensing component and potentially compromising device integrity
Note 1 to entry: Above the burst pressure the device function and integrity is no longer guaranteed.
3.16
vacuum
state of a fluid whose pressure is less than atmospheric pressure
3.17
diaphragm seal
remote seal
functional component that transfers the pressure to be measured to the PMT by hydraulic path
and decouples the PMT from influence factors stemming from the process
Note 1 to entry: A remote seal is connected to the transmitter by a capillary; the diaphragm seal is usually an
integral part of the transmitter.
Note 2 to entry: The primary purpose of using diaphragm/remote seals is to protect the sensing element against
high process temperatures or aggressive media.
Note 3 to entry: A diaphragm made of suitable material is responsible for the separation of the measured
fluids/gases and transmitter. A fluid adapted to the measurement task is responsible for the transfer of the pressure
to the measuring element.
Note 4 to entry: The diaphragm seal is included in the treatment of the total measurement error (e.g. temperature
influence, step response time, vacuum stability, etc.).
IEC 62828-2:2026 © IEC 2026
3.18
manifold
pipe fitting or similar device, such as a flanged joint, that connects multiple inputs or outputs,
allowing differential pressure PMTs to connect to the process
3.19
pressure transmitter
transmitter that outputs a signal representative of a pressure
3.20
destructive range
pressure range in which permanent changes occur to the metrological properties of the pressure
sensor and in which the transducer/transmitter can also be mechanically damaged
Note 1 to entry: It begins at the upper li
...