ASABE S572.1-2023 Droplet Spectrum Classification Matrix (Excel)

The ASABE S572.1-2023 standard replaces earlier classifications (e.g., ASAE S572.1-2004) with an improved, statistically robust framework grounded in laser diffraction measurements and extensive inter-laboratory validation. At its core, the classification matrix uses two primary hydraulic performance descriptors: the volumetric median diameter (DV0.5), representing the droplet size where 50% of the total spray volume is contained in droplets smaller than this value; and the relative span (RS), calculated as (DV0.9 - DV0.1) / DV0.5, which quantifies the breadth and uniformity of the droplet size distribution. By plotting DV0.5 (logarithmic scale, µm) against RS (linear scale), the standard partitions the plane into 12 non-overlapping, convex regions—each assigned a distinct droplet size class name, color code, and application guidance. This Excel resource implements these boundaries as conditional formatting rules, lookup tables, and automated classification logic, allowing users to input measured DV0.5 and RS values and instantly receive standardized class designation, uncertainty flags, and visual feedback. The matrix supports regulatory compliance (e.g., EPA pesticide label requirements), drift risk assessment, biological efficacy modeling, and nozzle selection workflows across crop protection, horticulture, and specialty agriculture.