GB/T 27991-2011

Water resources departments, hydrological agencies, research institutes, and instrument manufacturers use this standard to design, produce, and test sediment measurement and particle size analysis instruments. It ensures accuracy and reliability in measuring suspended load, bed load, and bed material, which is critical for river management, reservoir operation, and sediment research.

水利部门、水文机构、科研院所和仪器制造商使用该标准来设计、生产和检验河流泥沙测验及颗粒分析仪器。该标准确保仪器在测量悬移质、推移质和床沙时的准确性和可靠性，对河流治理、水库调度和泥沙研究至关重要。

This standard specifies fundamental technical requirements for sediment measurement and particle size analysis instruments in open channels, covering terms, classification, technical requirements, test methods, inspection rules, and marking/packaging. It applies to instruments used in rivers, lakes, reservoirs, and canals. The standard details technical parameters and performance requirements for suspended load, bed load, and bed material samplers, as well as sediment concentration meters and particle size analyzers, including sampling efficiency, measurement error, and environmental adaptability, along with corresponding test methods. It provides a unified basis for instrument design, production, and quality inspection.

该标准规定了河流泥沙测验及颗粒分析仪器的基本技术条件，包括术语定义、分类、技术要求、试验方法、检验规则及标志包装等。适用于江河、湖泊、水库、渠道等水体的泥沙测验。标准详细规定了悬移质、推移质、床沙采样器及含沙量测量仪、粒度分析仪的技术参数和性能要求，如采样效率、测量误差、环境适应性等，并提供了相应的试验方法。该标准为仪器设计、生产和质量检验提供了统一依据。