ASTM D7808-12
Standard Practice for Determining the Site Precision of a Process Stream Analyzer on Process Stream Material

Standard No.

ASTM D7808-12

Release Date

2012

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D7808-18

Latest

ASTM D7808-22

Scope

4.1 The analyzer site precision is an estimate of the variability that can be expected in a UAR or a PPTMR produced by an analyzer when applied to the analysis of the same material over an extended time period.

4.2 For applications where the process analyzer system results are required to agree with results produced from an independent PTM, a mathematical function is derived that relates the UARs to the PPTMRs. The application of this mathematical function to an analyzer result produces a predicted PPTMR. For analyzers where the mathematical function, that is, a correlation, is developed by D7235, the analyzer site precision of the UARs is a required input to the computation.

4.3 After the correlation relationship between the analyzer results and primary test method results has been established, a probationary validation (see D3764 and D6122) is performed using an independent but limited set of materials that were not part of the correlation activity. This probationary validation is intended to demonstrate that the PPTMRs agree with the PTMRs to within user-specified requirements for the analyzer system application. The analyzer site precision is a required input to the probationary validation procedures.

4.3.1 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 PTM then validation is done via D3764. Practice D3764 also applies if the process stream analyzer system uses a different measurement technology from the PTM, provided that the calibration protocol for the direct output of the analyzer does not require use of the PTM.

4.3.2 If the process stream analyzer system utilizes an indirect or mathematically modeled measurement principle such as chemometric or multivariate analysis techniques where PTMRs are required for the development of the chemometric or multivariate model, then validation of the analyzer is done using Practice D6122.

4.3.3 Both the D3764 and D6122 validation practices utilize the statistical methodology of Practice D6708 to conduct the probationary validation. This methodology requires that the site precision for the PTM and the analyzer site precision be available.

4.4 The procedures described herein also serve as the basis for a process analyzer quality cont......<......

ASTM D7808-12 Referenced Document

• ASTM D3764 Standard Practice for Validation of Process Stream Analyzer Systems
• ASTM D6122 Standard Practice for Validation of Multivariate Process Infrared Spectrophotometers
• ASTM D6299 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
• ASTM D6708 Standard Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
• ASTM D7235 Standard Guide for Establishing a Linear Correlation Relationship Between Analyzer and Primary Test Method Results Using Relevant ASTM Standard Practices
• ASTM D7278 Standard Guide for Prediction of Analyzer Sample System Lag Times
• ASTM D86 Standard Test Method for Distillation of Petroleum Products

ASTM D7808-12 history

• 2022 ASTM D7808-22 Standard Practice for Determining the Site Precision of a Process Stream Analyzer on Process Stream Material
• 2018 ASTM D7808-18 Standard Practice for Determining the Site Precision of a Process Stream Analyzer on Process Stream Material
• 2012 ASTM D7808-12 Standard Practice for Determining the Site Precision of a Process Stream Analyzer on Process Stream Material