Quality assurance of automated measurement systems
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Quality assurance of automated measurement systems. EN14181 approach General Quality Assurance Level 1 (QAL 1) Quality Assurance Level 2 (QAL 2) Quality Assurance Level 3 (QAL 3) Annual Surveillance Test (AST). Contents of this presentation. Incited by (European) environmental legislation

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Quality assurance of automated measurement systems

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Quality assurance of automated measurement systems

Quality assurance of automated measurement systems


Contents of this presentation

EN14181 approach

General

Quality Assurance Level 1 (QAL 1)

Quality Assurance Level 2 (QAL 2)

Quality Assurance Level 3 (QAL 3)

Annual Surveillance Test (AST)

Contents of this presentation


En 14181 approach general 1

Incited by (European) environmental legislation

Quality assurance of Automated Measurement Systems (AMS) without specification of measurement principle

Netherlands: Continuous and Predictive emission monitoring systems (CEMS and PEMS)

Required uncertainty specified in legislation/permit

Expressed as 95% confidence interval

Confidence interval expressed as % of emission limit value

EN 14181 approach: general (1)


En 14181 approach general 2

EN 14181 approach: general (2)

  • four Quality Assurance Levels (QAL)

    • QAL1-3

    • Annual Surveillance Test (AST)


En 14181 approach qal1

EN 14181 approach: QAL1

  • Once only; during selection of measurement system

  • Identification of all uncertainty sources

  • Quantification of each uncertainty source

    • Specification of equipment

    • Actual circumstances

  • Calculation of the total uncertainty

  • Compliance test for uncertainty and response time

  • Calculation of statistical data for QAL3


En 14181 approach qal2 1

EN 14181 approach: QAL2 (1)

  • After installation and every 3/5 years

  • Calibration

    • Accredited laboratory

    • At least15 parallel measurements with Standard Reference Method (SRM) in 3 days within 4 weeks

    • Sampling system included

    • Calculation of calibration line (y=a+bx)

    • Implementation of calibration line

    • Determination of the valid calibration range


En 14181 approach qal2 2

EN 14181 approach: QAL2 (2)

  • Test for variability

    • compliance test for uncertainty

  • Functionality tests (see AST)


En 14181 approach qal 3

EN 14181 approach: QAL3

  • Periodic test for on going quality controlby operator

    • Zero and span check with control gasses

    • Evaluation of responses with Cusum/Shewart cards

    • Action when limits (QAL1) are exceeded

      • Adjustment of settings of analyser

      • Maintenance

  • Check on operation of AMS within valid calibration range

    • Less than 40% of measurements outside valid range

    • 5 weeks: less than 5% of measurements in a week outside valid range


En 14181 approach ast 1

EN 14181 approach: AST (1)

  • Yearly verification test

  • Functionality test

    • Inspection of sampling system for leakages and contamination

    • Inspection on alignment of in-situ measurements

    • Check on responstime and linearity

    • Check on documentation (log books, maintenance an functionality reports)

    • Serviceability


En 14181 approach ast 2

EN 14181 approach: AST (2)

  • Verification measurements

    • Accredited laboratory

    • 5 parallel measurements with Standard Reference Method (SRM) in 1 day

    • Check on validity of calibration line


En 14181 approach

EN 14181 approach

  • four Quality Assurance Levels (QAL)

    • QAL1-3

    • Annual Surveillance Test (AST)


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