EN 17255-1:2019

SLOVENSKI STANDARD
01-september-2019
Emisije nepremičnih virov - Sistemi za zajem in vrednotenje podatkov (DAHS) - 1.
del: Specifikacija zahtev za vrednotenje podatkov in poročanje
Stationary source emissions - Data acquisition and handling systems - Part 1:
Specification of requirements for the handling and reporting of data
Emissionen aus stationären Quellen - Auswerteeinrichtungen - Teil 1: Festlegung von
Anforderungen an die Handhabung und den Bericht von Daten
Émissions de sources fixes - Systèmes d'acquisition et de traitement de données - Partie
1 : Spécification des exigences relatives au traitement et à la déclaration de données
Ta slovenski standard je istoveten z: EN 17255-1:2019
ICS:
13.040.40 Emisije nepremičnih virov Stationary source emissions
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17255-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2019
EUROPÄISCHE NORM
ICS 13.040.40
English Version
Stationary source emissions - Data acquisition and
handling systems - Part 1: Specification of requirements
for the handling and reporting of data
Émissions de sources fixes - Systèmes d'acquisition et Emissionen aus stationären Quellen - Datenerfassungs-
de traitement de données - Partie 1 : Spécification des und Auswerteeinrichtungen - Teil 1: Festlegung von
exigences relatives au traitement et à la déclaration de Anforderungen an die Handhabung und den Bericht
données von Daten
This European Standard was approved by CEN on 26 May 2019.

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, Turkey 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17255-1:2019 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 and abbreviations . 12
4.1 Symbols . 12
4.2 Abbreviations . 13
5 Principles . 14
5.1 General . 14
5.2 Outline of approach . 15
6 Input data . 16
6.1 Emission data. 16
6.2 Peripheral data . 16
6.3 Flow data . 16
6.4 Plant process data . 16
6.5 Manually entered data . 16
7 First level data . 16
7.1 General . 16
7.2 FLD values . 17
7.3 Data outside the measurement range . 17
7.4 Status information associated with FLD . 17
7.4.1 AMS status . 17
7.4.2 Status of peripheral data . 18
7.4.3 Plant information . 18
7.5 Calculation of standardized first level data . 18
7.6 QAL3 . 19
7.7 Flow data . 19
8 Calculation of reported data . 20
8.1 General . 20
8.2 Averages . 20
8.2.1 General . 20
8.2.2 Block Averages . 20
8.2.3 Rolling Averages . 21
8.3 Calculation of short-term averages . 21
8.4 Status information associated with STA . 21
8.4.1 Status of the data . 21
8.4.2 Plant operation mode . 22
8.5 Validity of the STA . 22
8.6 STA of peripheral data. 23
8.6.1 Peripheral data from AMS . 23
8.6.2 Missing peripheral values . 24
8.7 Calculation of standardized short-term averages . 24
8.8 Calculation of SSTA for a common stack . 24
8.9 Calculation of mass emission for each STA period . 25
8.10 Calibration range check . 26
8.11 Validated short-term averages . 26
8.12 Long-term averages . 26
8.13 Percentage of values complying with ELV . 26
8.14 Mass emissions . 27
8.15 Invalidated days . 27
9 Reporting and summary statistics. 27
9.1 DAHS operational requirements . 27
9.2 Reports . 27
Annex A (informative) Data flow charts . 29
A.1 General . 29
A.2 Formation of first level data . 29
A.3 Determination of short-term averages . 30
A.4 Determination of standardized short-term averages . 31
A.5 Determination of validated short-term averages . 32
A.6 Determination of short-term averages of mass emissions . 32
A.7 Determination of long-term averages . 33
Annex B (normative) Conversion procedures . 34
B.1 General . 34
B.2 Conversion of volume fraction to mass concentration . 34
B.3 Conversion of volume to standard conditions . 34
B.4 Conversion of mass concentration with peripheral parameters . 35
B.5 Conversion of waste gas volume to standard conditions . 36
B.6 Calculation of volumetric gas flow . 36
B.7 Calculation of mass flow . 37
B.8 Calculation of NO as NO equivalent . 37
x 2
Annex C (informative) Determining capping levels . 38
C.1 Capping values . 38
C.2 Setting the level for capping . 38
Annex D (normative) Calculation of exceedance for CO over a rolling 24 h period . 39
Bibliography . 40

European foreword
This document (EN 17255-1:2019) has been prepared by Technical Committee CEN/TC 264 “Air
Quality”, the secretariat of which is held by DIN.
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 January 2020, and conflicting national standards shall
be withdrawn at the latest by January 2020.
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 1 of the EN 17255 series.
The EN 17255 series, published under the general title Stationary source emissions — Data acquisition
and handling systems, specifies:
— requirements for the handling and reporting of data;
— requirements on data acquisition and handling systems;
— requirements for the performance test of data acquisition and handling systems;
— requirements for the installation and on-going quality assurance and quality control of data
acquisition and handling systems.
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, Republic of North Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
This document forms part of a series of standards which, between them, govern the process for the
quality assurance of data received by a data acquisition and handling system (DAHS) from automated
measuring systems (AMS), being used for monitoring emissions from stationary sources and quality
ensured to EN 14181.
The input data can be either in analogue representation or in digital form directly from an AMS or via a
digital bus system. Inputs can include the data from the AMS, peripheral data needed for calculation of
reported data and information on plant conditions needed to apply data selection criteria.
The data acquisition and handling system (DAHS) receives the raw data, as they are measured, averaged
and presented by the AMS, and converts, averages, stores and reports data as required by legislation.
This series of standards suggests that the process of data handling is best performed in a dedicated DAHS.
It does not preclude the use of other options for all or part of the process provided that it can be shown
that they meet all of the requirements of the standard, particularly in relation to speed, accuracy, access,
security and validation.
This series of standards applies to DAHS installed after the date of implementation.
EN 17255-1 relates specifically to the handling of the data. It defines the calculations to be carried out to
produce the data outputs that DAHS provide. It specifies the minimum outputs required to meet the
requirements of legislation such as the European Industrial Emissions Directive (IED) and the regulations
defining the European Pollutant Release and Transfer Register (E-PRTR). The calculations are based on
the requirements in these directives and regulations. These two reporting requirements form the basis
of this series of standards. However, although DAHS can provide other data outputs, such calculations are
outside the scope of this standard. The European emissions trading regulation defines different validation
and procedures for missing data, but the general principles in this standard can be used.

1 Scope
This document specifies the conversion of raw data from an automated measuring system (AMS) to
reported data by a data acquisition and handling system (DAHS). This specification includes:
— requirements for the handling of data;
— requirements for the reporting of data;
— calculation procedures required.
The main items covered by this document are given by, but not limited to raw data acquisition, raw data
validation, data correction and data averaging.
This document supports the requirements of EN 14181 and legislation such as the IED and E-PRTR. It
does not preclude the use of additional features and functions provided the minimum requirements of
this document are met and that these features do not adversely affect data quality, clarity or access.
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 14181:2014, Stationary source emissions — Quality assurance of automated measuring systems
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 http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
data acquisition and handling system
DAHS
system, which automatically receives, processes, stores and outputs data from automated measuring
systems
3.2
automated measuring system
AMS
measuring system permanently installed on site for continuous monitoring of emissions or measurement
of peripheral parameters
[SOURCE: EN 14181]
Note 1 to entry: Apart from the analyser, an AMS includes facilities for taking samples (e.g. probe, sample gas
lines, flow meters and regulator, delivery pump) and for sample conditioning (e.g. dust filter, pre-separator for
interferents, cooler, converter). This definition also includes testing and adjusting devices that are required for
functional checks and, if applicable, for commissioning.
Note 2 to entry: The term “automated measuring system” (AMS) is typically used in Europe. The term
“continuous emission monitoring system” (CEMS) is also typically used in the UK and USA.
Note 3 to entry: An AMS can provide data on reportable quantities (e.g. mass concentration of a pollutant),
peripheral parameters used to adjust the data (e.g. oxygen) or measured quantities which are subsequently
combined with other data to form reported data (e.g. flow subsequently used with mass concentration to form mass
emission data).
3.3
measurand
particular quantity subject to measurement
[SOURCE: EN 15259:2007]
Note 1 to entry: The measurand is a quantifiable property of the stack gas, for example mass concentration of a
measured component, temperature, velocity, mass flow, oxygen content and water vapour content.
3.4
peripheral parameter
specified physical or chemical quantity which is needed for conversion of measured values to specified
conditions
[SOURCE: EN 14181:2014]
Note 1 to entry: Peripheral parameters are called “reference quantities” in EN 15259.
Note 2 to entry: Peripheral parameters for standardizing the mass concentration of a pollutant are for instance
the concentration of oxygen, concentration of water vapour, temperature, and pressure.
3.5
plant process parameter
specified quantity describing plant conditions or other plant information
3.6
emission limit value
ELV
limit value given in regulations such as EU Directives, ordinances, administrative regulations, permits,
licences, authorisations or consents
Note 1 to entry: ELV can be stated as concentration limits expressed as half-hourly, hourly and daily averaged
values, or mass flow limits expressed as hourly, daily, weekly, monthly or annually aggregated values.
Note 2 to entry: ELV is mostly stated at standard conditions for dry gas and at a reference oxygen concentration.
3.7
maximum permissible uncertainty
uncertainty requirement on AMS measured values given by legislation or competent authorities
[SOURCE: EN 14181:2014]
3.8
legislation
directives, acts, ordinances and regulations
[SOURCE: EN 15267-1:2009]
3.9
calibration function
linear relationship between the values of the SRM and the AMS with the assumption of a constant residual
standard deviation
[SOURCE: EN 14181:2014]
Note 1 to entry: The calibration function is determined in QAL2.
Note 2 to entry: EN 13284-2 allows the use of quadratic calibration functions in specific cases.
3.10
valid calibration range
range of calibrated measured values at standard conditions determined during QAL2 or AST
Note 1 to entry: The valid calibration range is defined in EN 14181 and EN ISO 16911-2.
3.11
measurement range
range of values that the raw data from an AMS can lie within and be considered valid
Note 1 to entry: For AMS using an analogue 4 mA to 20 mA output the measurement range is conventionally
taken as being equivalent to the 4 mA to 20 mA range. For analogue and digital data the valid range of values can be
defined by legislation, derived from instrument testing or be an internal configuration of the AMS.
Note 2 to entry: The measurement range is not the same as the calibration range as the calibration range is
defined in terms of standardized calibrated values.
3.12
data
recorded value with associated information
Note 1 to entry: Associated information can be status signals.
3.13
raw data
value received directly from the AMS, optionally after scaling e.g. to units representing concentrations,
and associated status signals
Note 1 to entry: Status signals can be the status of the measured values or plant operation status.
3.14
valid data
data which are deemed to have passed particular quality requirements related to a specified usage
3.15
data product
defined data, recorded or calculated from input data, with a specified method of determination, and
available to the user of the DAHS as a recognised data set
Note 1 to entry: Examples specified in this standard include FLD, STA and LTA.
3.16
first level data
FLD
raw data or average values calculated from the raw data, both including status signals
Note 1 to entry: The raw data can be converted to concentration units.
3.17
standardized first level data
SFLD
first level data calibrated and converted to standard conditions using peripheral first level data
Note 1 to entry: This value is not for compliance assessment but can used to provide data that are used by the
operator for process or abatement control or optimization.
3.18
status signal
binary value or enumerated value from the plant, AMS or operation personnel signifying a specific state
of operation
3.19
binary value
value which can assume one of two discrete values
Note 1 to entry: The two discrete values are usually associated with the Boolean values 0 and 1, FALSE and TRUE.
Note 2 to entry: Binary values can be received from the plant, be generated by the DAHS, from the AMS or be
keyed in by the operator's personnel.
3.20
enumerated value
value which can only assume one of a number of defined states
3.21
average
arithmetic mean of valid data over a specified time period T
Note 1 to entry: The time period over which the average is calculated can be fixed, rolling, partial or accumulating.
3.22
accumulating average
arithmetic mean of valid data over a time period with a fixed starting point and floating end point up to a
limit T
Note 1 to entry: An accumulating average can be calculated as an average in which the time period begins at
midnight or any integral multiple of a specified time period T thereafter. With t being the time between two data
samples, an accumulating average is calculated during each period of length T. During the time of calculation, the
average period increases from t to T as the number of data included in the calculation is increased from 1 to T/t.
The accumulating average is calculated at the end of each time period t.
Note 2 to entry: At the end of each time period T the accumulating average is the same as the block average over
the same time period.
Note 3 to entry: Accumulating averages are not used for emissions reporting but can be used by operators for an
early identification of possible exceedances of an emission limit value.
3.23
block average
average over a fixed time period at a fixed time
Note 1 to entry: A block average is an average in which the time period begins at midnight or any integral multiple
of this time period thereafter. The block average is calculated at the end of each time period.
3.24
rolling average
average over a fixed time period and calculated at regular time intervals
3.25
short-term average
STA
average related to the shortest time period used for reporting
Note 1 to entry: Short-term averages are based on the shortest time period of averages the plant shall report to
the authorities for each measured component. According to variations in different EU Directives the shortest time
period can be 10 min, 30 min or 1 h, depending on the type and application of the plant.
3.26
standardized short-term average
SSTA
short-term average converted to standard conditions using short-term averages of peripheral
parameters
3.27
cumulative standardized short-term average
CSSTA
value determined according to the calculation for a standardized short-term average but determined as
an accumulated average calculated over a shorter time period
Note 1 to entry: This value is not for reporting. It can be used to provide an indication of whether the next SSTA
value is likely to exceed an ELV, before the full STA period has elapsed, potentially allowing for mitigating actions.
3.28
validated short-term average
VSTA
standardized short-term average with the relevant confidence interval subtracted to comply with EU
Directive reporting requirements
3.29
long-term average
LTA
average calculated from SSTA or VSTA over a specified time period as specified in 8.12
Note 1 to entry: A long-term average can be e.g. a daily, monthly or yearly average.
3.30
substitute value
value used instead of a missing value, e.g. due to fault or malfunction of the AMS
3.31
Coordinated Universal Time
UTC
time scale maintained by the International Bureau of Weights and Measures (BIPM) and the International
Earth Rotation Service (IERS) that forms the basis of a coordinated dissemination of standard frequencies
and time signals
Note 1 to entry: Adapted from EN ISO 19108:2005.
Note 2 to entry: UTC provides the basis of standard time, the use of which is legal in most European countries.
See also ISO 8601-1:2019.
Note 3 to entry: UTC divides time into days, hours, minutes and seconds.
3.32
time stamp
UTC or UTC plus a fixed offset throughout the year
Note 1 to entry: This does not include adjustment for daylight saving.
3.33
standard time
time scale derived from UTC, by a time shift established in a given location by the competent authority
[SOURCE: ISO 8601-1:2019, 3.1.1.14]
Note 1 to entry: The time shift of a standard time may vary in the course of a year, such as due to daylight savings.
3.34
Daylight Saving Time
DST
standard time during the summer months commonly obtained by adjusting the time forward by one hour
Note 1 to entry: Daylight saving time (DST), also known as summer time, is a conventional local time adopted
by many countries of the world on a seasonal basis. Most commonly DST is obtained by adjusting the time forward
by one hour for the spring, summer and early autumn periods.
3.35
reportable mode
mode or modes of plant operation during which reporting is required for a specific regulatory
requirement
Note 1 to entry: Reportable modes can include start-up, shut-down and normal operation.
Note 2 to entry: Different reporting requirements define different reportable modes. The term 'reportable mode'
is therefore used in this document to refer collectively to whichever specific conditions are applicable for a given
reporting regulation.
Note 3 to entry: The calculation stages defined in this document are repeated for different reportable modes and
for each pollutant.
4 Symbols and abbreviations
4.1 Symbols
c mass concentration
c mass concentration under standard conditions
ref
c(T ) mass concentration at standard temperature T
ref ref
c(p ) mass concentration at the reference pressure p
ref ref
c(h ) mass concentration at dry conditions
ref
c(o ) mass concentration at the standard oxygen volume fraction o
ref ref
E percentage of 10 min STA which do not exceed the ELV for the previous 24 h
−6
f volume fraction (e.g. in 10 )
f percentage of values that comply with the ELV
c
f percentage of values that shall comply with the ELV according to the appropriate regulation
r
F conversion factor for the conversion of volume measured at water vapour content h to
h m
standard conditions of water vapour content
F conversion factor for the conversion of volume measured at oxygen content o to standard
o m
conditions of oxygen content
F conversion factor for the conversion of volume measured at pressure p to standard
p m
conditions of pressure
F conversion factor for the conversion of volume measured at temperature T to standard
T m
conditions of temperature
h measured sample water vapour content (volume fraction) of the gas sampled
m
h standard water vapour content (volume fraction, h = 0 % at dry conditions)
ref ref
i counter
M molar mass (e.g. in kg/mol)
mol
N number of all VSTA or LTA values within reporting period
N number of VSTA or LTA that comply with the ELV within reporting period
c
N number of valid 10 min STA for the previous 24 h
v
*
number of valid 10 min STA which do not exceed the ELV for the previous 24 h
N
v
o measured oxygen content (volume fraction) of the gas sampled
m
o standard oxygen content (volume fraction)
ref
p measured pressure of the gas sampled
m
p standard pressure (p = 101,3 kPa)
ref ref
SSTA SSTA of the flow
F
SSTA SSTA of the flow in the common stack
FS
SSTA SSTA of the flow in the ith flue
FF,i
SSTA SSTA of the pollutant mass concentration
P
SSTA SSTA of the pollutant mass concentration in the ith flue
PF,i
SSTA SSTA of the pollutant mass concentration in the common stack
PS
STA STA of the flow
F
STA STA of the pollutant mass concentration
P
STA STA of the pollutant mass emission
PME
t STA period
STA
T (absolute) measured temperature of the gas sampled
m
T (absolute) standard temperature (T = 273,15 K)
ref ref
V waste gas volume under measuring conditions
m
V 3
mol molar volume (e.g. in m /mol)
V waste gas volume under standard conditions
ref

volumetric gas flow under measuring conditions

V
m

volumetric gas flow under standard conditions

V
ref
4.2 Abbreviations
AMS automated measuring system
AST annual surveillance test
BAT best available technique
BIPM International bureau of weights and measures
CSSTA cumulative standardized short-term average
DAHS data acquisition and handling systems
DST daylight saving time
ELV emission limit value
FLD first level data
IED Industrial Emissions Directive
LCP large combustion plant
LTA long-term average
OTNOC other than normal operating conditions
SFLD standardized first level data
SRM standard reference method
SSTA standardized short-term average
STA short-term average
UTC coordinated universal time
VSTA validated short-term average
5 Principles
5.1 General
This document specifies the requirements for calculations to be performed by data acquisition and
handling systems (DAHS) to provide reported data and other outputs. It fulfils a role within the overall
quality assurance of emissions monitoring data which is explicitly excluded from the EN 14181.
The primary function that the DAHS performs is to acquire, store and process AMS data to produce
emissions measurement results for evaluation in accordance with legislation. In order to meet the
reporting requirements of the relevant regulations (e.g. EU Directives), data are required with different
averaging times, and with different levels of conversion to reference conditions and quality assurance
checking. Within this standard, different levels of data are defined, termed data products. These consist
of data which have had successive levels of processing applied (e.g. averaging, application of calibration
functions, removal of data not meeting quality levels). This document defines three types of data
products:
a) first level data (FLD)
First level data are the lowest level data that are calculated and stored by the DAHS. They form the
basis for the calculations used to provide the reported data products. Storing of these data ensures
that other reportable data products can always be subsequently re-calculated.
b) reported emission data
Reported emission data are data such as validated short-term averages or long-term averages
required by legislation and used to compare against legislative limits or for entry into reporting
registers.
c) reported descriptive data
Reported descriptive data are required to demonstrate conformance with requirements of
legislation, usually for quality assurance purposes. These include, for example, data capture
requirements or counts of the number of exceedances of limits.
In addition this document defines some intermediate data (e.g. flags) which are recommended to enable
the correct calculation of the reported data, but which are not required if the functionality can be
implemented in a different way.
Those data outputs, that are solely required to implement quality assurance checks on the operation of
the DAHS itself, are not defined in this standard, but are defined where required in prEN 17255-2.
This document is intended to define common practice and approaches for data calculations and
transformation for the cases where legislation is ambiguous or does not specify an approach. In the case
where applicable legislation is unambiguous in defining the calculation then this may be implemented by
the DAHS.
5.2 Outline of approach
The conceptual flow of this document is as follows:
a) Data from AMS, plant and other data sources are input into the DAHS. Clause 6 defines the input data
handled by the DAHS.
b) The input data are processed to produce first level data (FLD). The determination of FLD is described
in Clause 7. The FLD are the data which shall be stored by the DAHS. This may include averaging and
validation stages, and correction according to QAL3 procedures if this is carried out by the DAHS.
c) FLD are converted to reported data following calculation procedures defined in Clause 8:
1) averaging FLD over the period of the short-term average (STA) as defined in 8.3;
2) conversion of averaged FLD to STA using the QAL2 calibration function as defined in 8.3;
3) evaluation of the validity of the STA as defined in 8.5;
4) conversion of STA to standard conditions using peripheral STA to form standardized short-term
averages (SSTA) as defined in 8.7;
5) calculation of mass emissions, where required, as defined in 8.9;
6) calculation of validated short-term averages (VSTA) as defined in 8.11;
7) calculation of long-term averages (LTA) as defined in 8.12.
Reported data may include data to be used by regulatory authorities, including competent authorities as
defined in the IED, for comparison against emission limit values. In such cases the DAHS shall implement
the calculation procedures required to provide emission data over the same conditions, averaging times,
operating modes and reference conditions as the limit values are expressed. In addition, further optional
data sets may be determined and displayed for use by the operator, but not intended for compliance
assessment. This document covers cumulative standardized STA (CSSTA), and instantaneous
standardized FLD (SFLD) as optional data sets.
Within this document where the term 'an AMS' is used it is implicit that the DAHS may handle data from
more than one AMS.
A single DAHS may take data from more than one AMS and produce reported data for different
measurands. These different data products may be determined using the same input data for peripheral
and plant status information. Conceptually the data handling process described in this document shall
apply to each measurand separately, although in implementation the DAHS may use the same peripheral
data, plant data and other relevant information in common for each measurand.
The same DAHS may be used for different AMS measuring different emissions sources. In such cases there
are separate peripheral data for each emissions source. In some situations there may be a final stage of
combination of multiple emission points in accordance with particular 'common stack' reporting
requirements.
In the case where parallel AMS are used on a single stack (to provide amongst other things redundancy)
these shall be treated as AMS measuring separate measured components. The DAHS may implement a
processing stage to assess the agreement between 'hot spares' as described in EN 14181:2014, 7.1.
Data products shall have an associated validity and status to allow interpretation of the data. In certain
cases the validity depends on the use for which the data product is intended. Within this document the
term 'flagging' of data are used to describe the information on validity and status that should be
associated with each data product. It does not define how this information should be associated, or imply
the use of specific flags. The DAHS shall provide the means to unambiguously associate the required
information with the specified data at the required level of granularity and be able to report these.
6 Input data
6.1 Emission data
The main input data are the emission data as provided by an AMS. Various status values can be associated
with the data, related to the functioning of the AMS.
6.2 Peripheral data
The peripheral data are data of peripheral parameters. The peripheral data can be provided by an AMS
or other sources. These data can include oxygen and water-vapour concentration data, temperature and
pressure required to calculate data at standard conditions.
The peripheral data shall be averaged over the same period of time as the data to which they are applied.
6.3 Flow data
If required for mass emission reporting flow data may be provided by a flow AMS. Alternatively flow data,
if required may be provided from plant systems or calculated from plant process parameters.
6.4 Plant process data
Plant process data related to plant process parameters are often required in order to flag certain data and
to determine which data are used to form data products. For example certain reporting requirements
exclude data from plant start-up and shut-down conditions. These data are usually acquired from the
process control system of the plant being monitored, but they can also be derived from the peripheral
data or entered manually. In addition in some cases plant process data may be used to derive other data
streams, for example the calculation of flue gas flow from surrogates.
6.5 Manually entered data
Data which are not provided automatically may be entered manually by an operator. Manual input shall
not overwrite automatically transmitted data.
7 First level data
7.1 General
The set of first level data (FLD) is the complete set of data from which reported emission data are derived.
It is composed of records of simultaneous values of AMS data for the emission data and any associated
peripheral AMS as well as AMS status data, other peripheral data, flow data if required and plant data,
marked with a time and date. It shall contain all data quantities required to form the reported data. The
status signals associated with the AMS providing the raw data input shall be associated with the relevant
FLD.
Each FLD shall be associated uniquely and unambiguously with values for all other parameters covering
the same time period.
Each FLD shall be associated with an unambiguous time stamp.
7.2 FLD values
FLD value
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