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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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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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