1.1本试验方法包括使用电导传感方法测定催化剂和催化剂载体颗粒的粒度分布，是测量粒度的几种有价值的方法之一。 1.2所研究的粒径范围为20至150μm（见IEEE/ASTM） 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。该方法使用的仪器是一个小尺寸的电流路径，由穿过孔径的单个粒子通道调制，并产生与粒子体积成比例的单个振幅脉冲。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 4.1本试验方法可用于确定可流化裂化催化剂中常见粒径范围内的材料规格、制造控制和研发工作的粒径分布。

1.1 This test method covers the determination of particle size distribution of catalyst and catalyst carrier 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 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== 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.