DPS
Drejtoria e Përgjithshme e Standardizimit
Phone: +355 4 222 62 55
E-mail: info@dps.gov.al
Address: Address: "Reshit Collaku" Str., (nearby ILDKPKI, VI floor), Po.Box 98, Tiranë - Albania
Main menu

ISO/PWI 21501-2

Determination of particle size distribution — Single particle light interaction methods — Part 2: Light scattering liquid-borne particle counter

General information

00.00     Apr 10, 2025

ISO

ISO/TC 24/SC 4

International Standard

Scope

This document describes a calibration and verification method for a light scattering liquid-borne particle counter (LSLPC), which is used to measure the size and particle number concentration of particles suspended in liquid. The light scattering method described in this document is based on single particle measurements. The typical size range of particles measured by this method is between 0,1 µm and 10 µm in particle size.
The method is applicable to instruments used for the evaluation of the cleanliness of pure water and chemicals, as well as the measurement of number and size distribution of particles in various liquids. The measured particle size using the LSLPC depends on the refractive index of particles and medium; therefore, the measured particle size is equivalent to the calibration particles in pure water.
The following are within the scope of this document:
— size setting error;
— counting efficiency;
— size resolution;
— false count;
— maximum particle number concentration;
— sampling flow rate error;
— sampling time error;
— sampling volume error;
— calibration interval;
— reporting results from test and calibration.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 21501-2:2019

NOW

IN_DEVELOPMENT
ISO/PWI 21501-2
00.00 Proposal for new project received
Apr 10, 2025