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Particle Counters: Influence of Flow Rate and Associated Standards
Particle Counters: Influence of Flow Rate and Associated Standards
I. Introduction: Why Sampling Flow Rate Matters   In high-cleanliness industries (e.g., semiconductor manufacturing, pharmaceutical production), particle counters are core equipment for ensuring production environment compliance. Sampling flow rate—a key parameter—directly determines monitoring data reliability and environmental representat. Understanding its mechanism is critical for accurately evaluating cleanroom quality.   II. Technical Principles & International Standards for Sampling Flow Rate   1. Light Scattering Mechanism & Flow Rate Correlation   The technical principle of sampling flow rate is based on the light scattering counting mechanism. Its core is correlating particle counting efficiency with environmental representat via sampling volume per unit time:   Larger flow rate: Collects more air per unit time → higher detection efficiency, suitable for rapid overall environmental status assessment.   Smaller flow rate: Ideal for long-term local monitoring or low-concentration environments.   2. ISO Standards for Flow Rate Specifications   International standards define clear flow rate ranges:   ISO 21501-4: Requires instruments with flow control systems to have a deviation ≤±5%.   ISO 14644-1: Mandates a flow rate ≥28.3L/min for detecting large particles (≥5μm); condensation nucleus laser particle counters are required for small particles (
July 29, 2025 1089
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