T/SXICS 006-2024 Calibration Specification for Multi-parameter Water Quality Analyzer

Scope

Scope: This document specifies the metrological characteristics, calibration conditions, calibration items, and calibration methods, as well as the expression of calibration results and calibration intervals for multi-parameter water quality analyzers (hereinafter referred to as the instrument). This document applies to the calibration of multi-parameter water quality analyzers capable of measuring the following parameters: - pH range: (0~14) - Conductivity range: (0~20) mS/cm - Turbidity range: (0~4000) NTU - Dissolved oxygen concentration range: (0~20) mg/L - Redox potential range: (-2000~2000) mV - Temperature range: (0~60) °C Main technical content: - Preface - Scope - Normative references - Overview - Metrological characteristics - Calibration conditions 5.1 Environmental conditions 5.2 Measurement standards and other equipment - Calibration items and methods 6.1 Calibration items 6.2 Calibration methods - Calibration result expression - Calibration intervals Appendix A (informative) Preparation of calibration water Appendix B (informative) Saturation concentration of oxygen in water at different water temperatures and atmospheric pressures, and calculation of saturated dissolved oxygen concentration in water by interpolation Appendix C (informative) Example of uncertainty evaluation of pH indication error Appendix D (informative) Example of uncertainty evaluation of redox potential indication error Appendix E (informative) Example of uncertainty evaluation of conductivity indication error Appendix F (informative) Example of uncertainty evaluation of dissolved oxygen concentration indication error Appendix G (informative) Example of uncertainty evaluation of turbidity indication error Appendix H (informative) Example of uncertainty evaluation of temperature indication error

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