1.1 本试验方法包括测定催化剂和催化剂载体的粒度分布（见术语 D3766 )颗粒使用导电传感方法，是测量颗粒尺寸的几种有价值的方法之一。 1.2 研究的颗粒尺寸范围为20 μm至150 μm（参见 IEEE/atm 硅 10 )等效球面直径。该技术能够测量高于和低于该范围的粒子。用于该方法的仪器是一个小尺寸的电流路径，由单个粒子通过孔径进行调制，并产生振幅与粒子体积成比例的单个脉冲。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 该试验方法可用于确定流化裂化催化剂中通常遇到的颗粒尺寸范围内的材料规格、制造控制和研发工作的颗粒尺寸分布。

1.1 This test method covers the determination of particle size distribution of catalyst and catalyst carrier (see Terminology D3766 ) particles using an electroconductive sensing method and is one of several valuable methods for the measurement of particle size. 1.2 The range of particle sizes investigated was 20 μm to 150 μm (see IEEE/ASTM SI 10 ) equivalent spherical diameter. The technique is capable of measuring particles above and below this range. The instrument used for this method is an electric current path of small dimensions that is modulated by individual particle passage through an aperture, and produces individual pulses of amplitude proportional to the particle volume. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 This test method can be used to determine particle size distributions for material specifications, manufacturing control, and research and development work in the particle size range usually encountered in fluidizable cracking catalysts.