ASTM D7235-10
(Guide)Standard Guide for Establishing a Linear Correlation Relationship Between Analyzer and Primary Test Method Results Using Relevant ASTM Standard Practices
Standard Guide for Establishing a Linear Correlation Relationship Between Analyzer and Primary Test Method Results Using Relevant ASTM Standard Practices
SIGNIFICANCE AND USE
This guide is intended to be used in conjunction with Practice D3764 (Case 1) and Practice D6122 (Case 2). Methodology in this guide can be used to determine if a linear correlation can improve the performance of the total analyzer system in terms of its ability to predict the results that the PTM would have been if applied to the same material. This methodology, which is based on the same statistical data treatment as Practice D6708, is use to derive the parameters of the linear relationship and to assess the degree of improvement.
This guide provides developers or manufacturers of process stream analyzer systems with useful procedures for developing the capability of newly designed systems for industrial applications that require reliable prediction of measurements of a specific property by a primary test method of a flowing component or product.
This guide provides purchasers of process stream analyzer systems with some reliable options for specifying performance requirements for process stream analyzer systems that are used in applications requiring reliable prediction of measurements of a specific property by a primary test method of a flowing component or product.
This guide provides the user of a process stream analyzer system with useful information on the work process for establishing the PTM prediction relationship and prediction performance.
Prediction (correlation) relationship obtained in the application of this guide is applicable only to the material type and property range of the materials used to perform the study. Selection of the property levels and the compositional characteristics of the samples must be suitable for the application of the analyzer system. Users are cautioned against extrapolation of the prediction relationship beyond the material type and property range used to obtain the relationship.
The degree-of-agreement assessment promoted in this guide is based on the statistical principles articulated in Practice D6708, which i...
SCOPE
1.1 This guide covers a general methodology to develop and assess the linear relationship between results produced by a total analyzer system versus the results produced by the corresponding primary test method (PTM) that the analyzer system is intended to emulate, using the principles and approaches outlined in relevant ASTM standard practices and guides.
1.2 This guide describes how the statistical methodology of Practice D6708 can be employed to assess agreement between the PTM and analyzer results, and, if necessary, develop linear correlation to further improve the agreement over the complete operating range of the analyzer. For instances where there is insufficient variation in property level to apply the Practice D6708 multi-level methodology, users are referred to Practice D3764 to perform a level specific bias evaluation. The correlation relationship information obtained in the application of this guide is applicable only to the material type and property range of the materials representative of those used to perform the assessment. Users are cautioned against extrapolation of the relationship beyond the material type and property range being studied.
1.3 This guide applies if the process stream analyzer system and the primary test method are based on the same measurement principle(s), or, if the process stream analyzer system uses a direct and well-understood measurement principle that is similar to the measurement principle of the primary test method. If the process stream analyzer system uses a different measurement technology from the primary test method, provided that the calibration protocol for the direct output of the analyzer does not require use of the PTM, this practice also applies.
1.4 This guide does not apply if the process stream analyzer system utilizes an indirect or mathematically modeled measurement principle such as chemometric or multivariate analysis techniques where results from PTM...
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Designation: D7235 − 10
StandardGuide for
Establishing a Linear Correlation Relationship Between
Analyzer and Primary Test Method Results Using Relevant
1
ASTM Standard Practices
This standard is issued under the fixed designation D7235; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Operation of a process stream analyzer system typically involves four sequential activities: (1)
Analyzer Calibration—When an analyzer is initially installed, or after major maintenance has been
performed, diagnostic testing will typically be performed to demonstrate that the analyzer meets
manufacturer’sspecificationsandhistoricalperformancestandards.Thesediagnostictestsmayrequire
that the analyzer be adjusted so as to provide predetermined output levels for certain reference
materials. (2) Correlation to Primary Test Method—For process stream analyzer systems where the
application objective is to provide prediction of results from a Primary Test method, once the
diagnostic testing is completed, process stream samples will typically be analyzed using both the
analyzer system and the corresponding primary test method.Amathematical function will be derived
thatrelatestheanalyzeroutputtotheprimarytestmethod(PTM).Theapplicationofthismathematical
function to an analyzer output produces a predicted PTM result. (3) Initial Validation—Once the
relationship between the analyzer output and primary test method results has been established, an
initial validation is performed using an independent data set to demonstrate that the predicted PTM
results agree with those from the primary test method within the tolerances established from the
Correlation activities and with no statistically observable systemic bias. (4) Continual Validation—
During normal operation of the process analyzer system, quality assurance testing is conducted to
demonstrate that the agreement between analyzer and primary test method results during the Initial
Validation is maintained. This document provides guidance for item (2) above.
1. Scope correlation to further improve the agreement over the complete
operating range of the analyzer. For instances where there is
1.1 Thisguidecoversageneralmethodologytodevelopand
insufficient variation in property level to apply the Practice
assess the linear relationship between results produced by a
D6708 multi-level methodology, users are referred to Practice
total analyzer system versus the results produced by the
D3764 to perform a level specific bias evaluation. The corre-
corresponding primary test method (PTM) that the analyzer
lation relationship information obtained in the application of
system is intended to emulate, using the principles and ap-
this guide is applicable only to the material type and property
proaches outlined in relevant ASTM standard practices and
range of the materials representative of those used to perform
guides.
the assessment. Users are cautioned against extrapolation of
1.2 This guide describes how the statistical methodology of
the relationship beyond the material type and property range
Practice D6708 can be employed to assess agreement between
being studied.
the PTM and analyzer results, and, if necessary, develop linear
1.3 This guide applies if the process stream analyzer system
1
and the primary test method are based on the same measure-
This guide is under the jurisdiction of ASTM Committee D02 on Petroleum
Products and Lubricants and is the direct responsibility of Subcommittee D02.25 on ment principle(s), or, if the process stream analyzer system
Performance Assessment and Validation of Process Stream Analyzer Systems.
usesadirectandwell-understoodmeasurementprinciplethatis
Current edition approved July 1, 2010. Published October 2010. Originally
similar to the measurement principle of the primary test
approved in 2005. Last previous edition approved in 2005 as D7235–05. DOI:
10.1520/D7235-10. method. If the process stream analyzer system uses a different
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D7235 − 10
measurement technology from the primary test method, pro- Measurement System Performance
vided that the calibration protocol for the direct output of the D6624 Practice for Determining a Flow-Proportioned Aver-
analyzer does not require use of the PTM, this practice also age Property Value (FPAPV) for a Collected Batch of
applies. Process Stream Material Using Stream Analyzer Data
D6708 Practice for StatisticalAssessment and Improve
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D7235–05 Designation: D7235 – 10
Standard Guide for
Establishing a Linear Correlation Relationship Between
Analyzer and Primary Test Method Results Using Relevant
1
ASTM Standard Practices
This standard is issued under the fixed designation D7235; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Operation of a process stream analyzer system typically involves four sequential activities: (1)
Analyzer Calibration—When an analyzer is initially installed, or after major maintenance has been
performed, diagnostic testing will typically be performed to demonstrate that the analyzer meets
manufacturer’sspecificationsandhistoricalperformancestandards.Thesediagnostictestsmayrequire
that the analyzer be adjusted so as to provide predetermined output levels for certain reference
materials. (2) Correlation to Primary Test Method—For process stream analyzer systems that are not
primary test methods (PTM),where the application objective is to provide prediction of results from
aPrimaryTestmethod,oncethediagnostictestingiscompleted,processstreamsampleswilltypically
be analyzed using both the analyzer system and the corresponding primary test method. A
mathematical function will be derived that relates the analyzer output to the primary test method
(PTM).TheapplicationofthismathematicalfunctiontoananalyzeroutputproducesapredictedPTM
result. (3) Initial Validation—Once the relationship between the analyzer output and primary test
method results has been established, an initial validation is performed using an independent data set
to demonstrate that the predicted PTM results agree with those from the primary test method within
the tolerances established from the Correlation activities and with no statistically observable systemic
bias. (4) Continual Validation—During normal operation of the process analyzer system, quality
assurance testing is conducted to demonstrate that the agreement between analyzer and primary test
method results during the Initial Validation is maintained. This document provides guidance for item
(2) above.
1. Scope
1.1 This guide covers a general methodology to develop and assess the linear relationship between results produced by a total
analyzer system versus the results produced by the corresponding primary test method (PTM) that the analyzer system is intended
to emulate, using the principles and approaches outlined in relevant ASTM standard practices and guides.
1.2 This guide describes how the statistical methodology of Practice D6708 can be employed to assess agreement between the
PTM and analyzer results, and, if necessary, develop linear correlation to further improve the agreement over the complete
operating range of the analyzer. For instances where there is insufficient variation in property level to apply the Practice D6708
multi-level methodology, users are referred to Practice D3764 to perform a level specific bias evaluation. The correlation
relationship information obtained in the application of this guide is applicable only to the material type and property range of the
materials representative of those used to perform the assessment. Users are cautioned against extrapolation of the relationship
beyond the material type and property range being studied.
1.3 This guide applies if the process stream analyzer system and the primary test method are based on the same measurement
principle(s), or, if the process stream analyzer system uses a direct and well-understood measurement principle that is similar to
the measurement principle of the primary test method. If the process stream analyzer system uses a different measurement
technology from the primary test method, provided that the calibration protocol for the direct output of the analyzer does not
1
This guide is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.25 on
Performance Assessment and Validation of Process Stream Analyzer Systems for Petroleum and Petroleum Products.
Current edition approved Dec. 1, 2005. Published February 2006. DOI: 10.1520/D7235-05.on Performance Assessment and Validation of Process Stream Analyzer
Systems.
Current edition approved July 1, 2010. Published October 2010. Originally approved in 2005. Last previous edition
...
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