SIST EN 61207-6:1998
(Main)Expression of performance of gas analyzers -- Part 6: Photometric analyzers
Expression of performance of gas analyzers -- Part 6: Photometric analyzers
Applies to analyzers using non-dispersive and dispersive wavelength selection and using absorption, emission, or wavelength derivative techniques. Applies to analyzers receiving conditioned or unconditioned samples of gas under vacuum or pressurized, and to measurements directly within the sample gas.
Angabe zum Betriebsverhalten von Gasanalysatoren -- Teil 6: Fotometrische Analysatoren
Expression des qualités de fonctionnement des analyseurs de gaz -- Partie 6: Analyseurs photométriques
S'applique aux analyseurs basés sur la sélection de longeur d'onde par méthode non dispersive et dispersive et utilisant des techniques d'absorption, d'émission ou de dérivation par rapport à la longeur d'onde. S'applique aux analyseurs qui reçoivent un échantillon conditionné ou non conditionné soit sous vide, soit sous pression, et qui mesurent les concentrations directement dans le gaz échantillon
Expression of performance of gas analyzers - Part 6: Photometric analyzers (IEC 61207-6:1994)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61207-6:1998
01-november-1998
Expression of performance of gas analyzers - Part 6: Photometric analyzers (IEC
61207-6:1994)
Expression of performance of gas analyzers -- Part 6: Photometric analyzers
Angabe zum Betriebsverhalten von Gasanalysatoren -- Teil 6: Fotometrische
Analysatoren
Expression des qualités de fonctionnement des analyseurs de gaz -- Partie 6:
Analyseurs photométriques
Ta slovenski standard je istoveten z: EN 61207-6:1994
ICS:
71.040.40 Kemijska analiza Chemical analysis
SIST EN 61207-6:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 61207-6:1998
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SIST EN 61207-6:1998
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SIST EN 61207-6:1998
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SIST EN 61207-6:1998
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SIST EN 61207-6:1998
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SIST EN 61207-6:1998
CEI
NORME
IEC
INTERNATIONALE
1207-6
INTERNATIONAL
Première édition
STANDARD
First edition
1994-02
Expression des qualités de fonctionnement
gaz -
des analyseurs de
Partie 6:
Analyseurs photométriques
Expression of performance of gas analyzers -
Part 6:
Photometric analyzers
Copyright — all rights reserved
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SIST EN 61207-6:1998
1207-6 © IEC:1994 - 3 -
CONTENTS
Page
FOREWORD 5
INTRODUCTION 7
Clause
1 Scope and object 9
2 Normative references 9
11
3 Definitions
15
4 Procedure for specification
15
4.1 Specification of essential ancillary units and services
rformance 15
4.2 Additional terms related to the specification of pe
17
5 Recommended standard values and range of influence quantities
17
6 Procedures for compliance testing
23
Figures
Annexes
23
A Techniques and systems of photometric analysis
29
B Methods of preparation of water vapour in test gases
33
Bibliography
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SIST EN 61207-6:1998
1207-6 ©IEC:1994 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
EXPRESSION OF PERFORMANCE OF GAS ANALYZERS -
Part 6: Photometric analyzers
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
rnational Standards.
electronic fields. To this end and in addition to other activities, the IEC publishes Inte
Their preparation is entrusted to technical committees; any IEC National Committee interested in
the subject dealt with may participate in this preparatory work. International, governmental and
non-governmental organizations liaising with the IEC also participate in this preparation. The IEC
collaborates closely with the International Organization for Standardization (ISO) in accordance with
conditions determined by agreement between the two organizations.
The formal decisions or agreements of the IEC on technical matters, prepared by technical committees on
2)
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
They have the form of recommendations for international use published in the form of standards, technical
3)
reports or guides and they are accepted by the National Committees in that sense.
In order to promote international unification, IEC National Committees undertake to apply IEC International
4)
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
International Standard IEC 1207-6 has been prepared by sub-committee 65D: Analyzing
equipment, of IEC technical committee 65: Industrial-process measurement and control.
The text of this standard is based on the following documents:
Report on voting
DIS
65D(CO)7
65D(CO)2
rt
Full information on the voting for the approval of this standard can be found in the repo
on voting indicated in the above table.
6 of the 1207 series of publications under the general title:
rt
IEC 1207-6 constitutes pa
Expression of performance of gas analyzers.
1: General
Pa rt
Part 2: Oxygen in gas
rt 6: Photometric analyzers
Pa
Parts 3, 4 and 5 are under consideration.
Annex A forms an integral pa rt of this standard.
Annex B is for information only.
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SIST EN 61207-6:1998
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1207-6 © IEC:1994
INTRODUCTION
Photometric analyzers utilize detectors which respond to wavelengths in the ultraviolet,
visible and infrared part of the electromagnetic spectrum (wavelengths 180 nm to 20 µm).
Within this range of wavelengths many gases have absorption/emission bands. Analyzers
designed to utilize these bands employ several techniques, including sensing of absorbed
radiation, and sensing of emitted radiation from artificially excited molecules, and sensing
of the radiation intensity/wavelength derivative. The volume of gas measured may be
contained within a sample cell, this sample may or may not be conditioned, or the concen-
tration may be directly measured within the sample gas.
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SIST EN 61207-6:1998
1207-6 ©IEC:1994 - 9 -
EXPRESSION OF PERFORMANCE OF GAS ANALYZERS -
Part 6: Photometric analyzers
1 Scope and object
This part of IEC 1207 applies to all aspects of analyzers using photometric techniques for
the measurement of concentration of one or more components in a mixture of gases or
vapours. It should be used in conjunction with IEC 1207-1.
It applies to analyzers using non-dispersive and dispersive wavelength selection and using
absorption, emission, or wavelength derivative techniques.
It applies to analyzers which receive either a conditioned or unconditioned sample of gas
either under vacuum, at ambient pressure or pressurized.
It applies to analyzers which measure gas concentrations directly within the sample gas.
The object of this pa rt is:
rformance of
- to specify the terminology and definitions related to the functional pe
gas analyzers, utilizing a photometric analyzer, for the continuous measurement of gas
or vapour concentration in a source gas;
to unify methods used in making and verifying statements on the functional perform-
-
ance of such analyzers;
ormance
- to specify what tests should be performed to determine the functional pe rf
and how such tests should be carried out;
rt the application of standards of quality
- to provide basic documents to suppo
assurance ISO 9001, ISO 9002 and ISO 9003.
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this part of IEC 1207. At the time of publication, the editions
rties to
indicated were valid. All normative documents are subject to revision, and pa
of IEC 1207 are encouraged to investigate the possibility of
agreements based on this pa rt
applying the most recent editions of the normative documents indicated below. Members
of IEC and ISO maintain registers of currently valid International Standards.
Operating conditions for industrial-process measurement and control equipment
IEC 654:
Expression of performance of gas analyzers - Part 1: General
IEC 1207-1: 1994,
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SIST EN 61207-6:1998
1207-6 ©IEC:1994 - 11 -
3 Definitions
See figure A.1 for the relationship between types of instruments.
An electro-optical instrument consisting of a single or double
3.1 infrared analyzer:
source of infrared radiation and one or more infrared detectors separated from the source
by a measuring path wherein the specific spectral absorption of the component of interest
is determined.
NOTES
, the analyzer is adjusted by the manufacturer to select only the spectral
1 For the purpose of this pa rt
band(s) at which the component to be determined has its characteristic absorption, and the measuring path
dimensions are appropriate for the rated range of concentration and application of the analyzer.
2 Specific spectral sensitivity is obtained by a selective component such as a selective source, selective
detector or selective filter, gas-filled cell or dispersive element, or any combination of these components.
An analyzer as defined in 3.1 but where the spectral
3.2 ultraviolet (visible) analyzer:
absorption of the component determined occurs at wavelengths between 180 nm and
1 000 nm, hence the source(s), detector(s) and other optical components operate in the
visible light or ultraviolet part of the electromagnetic spectrum.
NOTE - The visible part of the spectrum is included in this definition for ease of reference.
An analyzer whereby the radiation passage through the meas-
3.3 dual-beam analyzer:
ured gas and a reference gas follows separate physical paths.
An analyzer whereby the radiation follows a single path
3.4 single-beam analyzer:
through the sample gas, and measuring and reference signals are derived from wave-
length selection (see 3.5), or for a single-beam single-wavelength analyzer, no reference
signal is generated.
An analyzer where measuring and
dual-wavelength filter-correlation analyzer:
3.5
reference signals are derived by optical filter wavelength selection within and outside an
absorption band respectively. These two signals are processed to derive a concentration
value.
An analyzer where measuring and reference signals are
3.6 gas correlation analyzer:
derived by utilizing a cell filled with the gas to be measured to absorb selectively radiation
corresponding to the fine structure of the absorption line spectrum of that gas. The two
signals are processed to derive a concentration value.
NOTE - The gas-filled component may be part of the detector.
An analyzer which measures gas-component
3.7 wavelength derivative analyzer:
concentrations using wavelength modulation of the radiation, and thereby uses the first
derivative or second derivative of intensity versus wavelength to measure the shape of the
absorption band.
An analyzer which measures gas-component concentrations
3.8 fluorescence analyzer:
by detecting the emission of radiation from excited molecules in relaxation to the ground
state.
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SIST EN 61207-6:1998
1207-6 © IEC:1994 - 13 -
The components that cause excitation are part of the analyzer.
NOTES
1 Fluorescence can occur when molecules absorb short-wavelength radiation, an electron is excited to a
higher energy level, and subsequently relaxes with emission of radiation.
2 Chemiluminescence analyzers utilize a chemical reaction to produce molecules in an excited state.
extractive analyzer: An analyzer which receives a continuous stream of gas with-
3.9
drawn from a process by a sample handling system.
A system which connects one or more process analyzers
3.10 sample-handling system:
with the source fluid and the disposal points.
NOTE - The performance of this system is not dealt with in this pa rt except for dilution sampling systems.
system which samples process fluid and adds a
3.11 dilution sampling system: A
diluent to the sample stream prior to measurement.
NOTE - This type of system generally applies calibration gas prior to the dilution point and hence the
rt in situ analyzer for the purposes of this part .
dilution system is treated as pa of an
An analyzer where the volume of gas sensed, that is within the
3.12 In situ analyzer:
measuring path for a photometric analyzer, is situated within the process source fluid.
analyzer will contain a fixed-length measuring cell within the duct and its calibration is not
NOTE - An in situ
affected by the dimensions of the duct.
An analyzer where the measuring path is formed by the
3.13 across-duct analyzer:
entire width of the process duct.
NOTE - The radiation source and detector can be mounted on opposite sides of the duct, or both can be
mounted on the same side and a retroreflector employed. Where the retroreflector is within the duct, the ana-
lyzer is of the in situ type.
A continuous stream of gas withdrawn from the source gas
3.14 conditioned sample:
and filtered, cooled, and dried to within specified limits before application to a sampling
analyzer.
A continuous stream of gas withdrawn from the source gas, which
3.15 heated sample:
may or may not be filtered but is maintained at a temperature above its dew-point, includ-
ing within the analyzer.
The absorption of radiation, at the wavelengths used for measurement, by
3.16 opacity:
components of the sample gas, other than the component to be measured.
Essential ancillary units are those without which the
3.17 essential ancillary units:
analyzer will
...
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