particle counter Articles

  • Particle Counters and PoE

    Abstract Connecting instruments and electronics to power outlets can be challenging—especially in remote locations where an outlet is not easily reached. A technology that is quickly expanding is Power over Ethernet (PoE) because it provides power and network communications through a standard network cable. This application note discusses PoE technology and the ...


    By Particle Measuring Systems

  • LiQuilaz® Particle Counter Maintenance: Capillary Cleaning Procedures

    Abstract For optimal performance of a liquid particle counter occasional cleaning of the liquid capillary is required. Multiple methods can be used to achieve better cleanliness. This is a basic instruction guide for multiple cleaning methods for the capillary of a LiQuilaz II liquid particle ...


    By Particle Measuring Systems

  • Performance Calculator Instructions

    Introduction Frequently, particle counter users are faced with trying to determine which particle counting system will provide the best statistical data for monitoring their ultrapure liquid system. When comparing the specifications of different particle counters, many of the specifications appear similar making it difficult to ascertain which system is superior and most appropriate for ...


    By Particle Measuring Systems

  • Statistical Analysis: Liquid-Borne Particles

    Abstract The impact of statistics on choosing and using a liquid particle counter is reviewed. The statistical techniques used with liquid particle counters are well known and relatively simple, but the simultaneous impact of both sample volume and size sensitivity on liquid particle data has not been fully explored in the literature. Both sample volume and sensitivity effect the total number of ...


    By Particle Measuring Systems

  • How to Select a Portable Airborne-Particle Counter for ISO Certification of Cleanrooms

    Basics Certain factors are routinely considered for any particle counter purchase, such as price, warranty, quality, and expected laser lifetime. When selecting a particle counter for cleanroom certification it is important to consider additional factors. Of these, sensitivity and flowrate are the most important parameters, both of which determine the sampling time required to complete ...


    By Particle Measuring Systems

  • Powder Filling – When And Where To Monitor

    Abstract Powder filling is the process predominately associated with active pharmaceutical ingredients (API) where bulk powdered materials are filled into vessels prior to shipping to secondary processors. The very act of powder filling in a Restricted Access Barrier System (RABS) enclosure will create a dust cloud so dense that a particle counter operating in that area will become saturated and ...


    By Particle Measuring Systems

  • Guide to How Aerosol Particle Counters Work

    Abstract Aerosol particle counters are built to rapidly count and size contaminant particles in cleanroom air and other controlled environments. Users tend to see this equipment as simply a device which, when the appropriate button is pressed, absolute results are displayed. However, it is important to be aware of the technology within the instrument in order to understand the relevance of the ...


    By Particle Measuring Systems

  • Counting efficiency and resolution in optical particle counters

    Abstract Counting Efficiency and Resolution in Optical Particle CountersCounting efficiency and size resolution are important concepts to understand when discussing the performance of a particle counting system. These concepts and how they apply to a particle counter are described in this application ...


    By Particle Measuring Systems

  • New Particle Monitoring Strategies in UPW for 300 mm Fabs

    Abstract Process failures caused by particles in Ultra Pure Water (UPW) are relatively infrequent events, but with the move to 300 mm wafers and 90 nm line widths, they can have significant financial impact. Most particle monitoring strategies in the past focused on the use of the mobile and inline high sensitivity 0.05 micron particle counters. This paper examines the opportunities to improve ...


    By Particle Measuring Systems

  • Counting Efficiency and Resolution in Optical Particle Counters

    Counting efficiency is the probability that an Optical Particle Counter (OPC) will sense and accurately count a particle passing through the particle counter’s sample volume. This probability describes the percentage of particles counted at—or above—a specified particle size. In the adjacent figure, three plots illustrate counting efficiency versus particle size. Curve A (the ...


    By Particle Measuring Systems

  • Sampling compressed gas with the Lasair III particle counter

    Abstract This document provides technical information and recommended methods for sampling compressed gas using the Lasair® III Particle Counter in combination with the High Pressure Diffuser III (HPD ...


    By Particle Measuring Systems

  • Syringe Sampling for Counting Particles in Fluids

    Before measuring particles in fluid, consider the method for delivering the sample fluid to the particle counter. For unpressurized fluid sources, the choices available depend on the sample fluid. Water provides the greatest range of options, while fluorinated chemistries such as HF can significantly restrict the options. Compatibility of the wetted surfaces with the sampling fluids will help you ...


    By Particle Measuring Systems

  • Particle counter is used for subsea injection control

    “Production chemicals used in subsea applications have to be produced to a high specification of cleanliness, typically to better than NAS 8 (or the equivalent SAE AS4059 specification). This is because subsea injection systems typically terminate in narrow bore control valves that are prone to blockage by even the smallest particulates. Measurement of these production chemicals is ...


    By Spectrex Corporation

  • NanoVision Technology Liquid Optical Particle Counters Enter the Digital Age

    Abstract There are many industries that use Optical Particle Counters (OPC) to monitor particle contamination in liquids. While liquid OPCs have evolved with time they have employed the same general light-scattering design principles. Now, NanoVision Technology brings particle counters to the digital age, utilizing a high density two dimensional array of high-efficiency detector elements. This ...


    By Particle Measuring Systems

  • CLS-700T Communications Technical Information

    Abstract Corrosive Liquid Sampler (CLS) model 700T is a computer controlled device which includes a pressurized sampler system and a liquid particle counter. Both devices must be communicated with separately via different network addresses. This paper outlines the communication requirements as applied to a CLS-700T/ LiQuilaz instrument ...


    By Particle Measuring Systems

  • Particle Tubing Transportation to a Particle Counter

    The following describes particle behavior mechanisms and will assist in the understanding of sampling difficulties and how to improve the efficiency of sampling using a particle counter. The Stokes number is the ratio of a particle’s radius to the dimension of an obstacle in fluid flow. This is an important factor in determining when a particle in motion will be collected by an obstacle ...


    By Particle Measuring Systems

  • Syringe Sampling for Counting Particles in Fluids

    Abstract A syringe sampler represents the simplest delivery system for precisely delivering a sample to the particle counter. The precision motion of the syringe drive produces a steady flow of fluid that is free of pulsations that are typical of most pumps suitable for chemical delivery. An overview of the syringe sampling system is ...


    By Particle Measuring Systems

  • Sizing Accuracy of a LiQuilaz-S Particle Counter

    Abstract The need to verify the performance of a volumetric Optical Particle Counter (OPC) is necessary in many applications. This paper describes the correct method to verify the performance of a LiQuilaz-S series OPC by calculating the sizing accuracy. In order to calculate the sizing accuracy, you must precisely collect particle count data and know the instrument’s resolution. These ...


    By Particle Measuring Systems

  • The particle counter useful for formulation and process developement of parenterals

    Comments by major pharmaceutical company research scientist. We've found the Spectrex to be a very useful tool in formulation and process development for parenteral products in cases where the volume of solution available is limited, and we are primarily interested either in 1) differences in relative numbers and sizes of particles when comparing various formulations or processing treatments, or ...


    By Spectrex Corporation

  • Selecting an Airborne Particle Counter: Terminology and Standards (Series Part 1 of 4)

    Your needs for an airborne particle counter can depend on monitoring environment, communications, desired flowrate, and the particle sizes of interest. Don’t know where to start? Read on for an overview of the basics for choosing the method to monitor your process air. Common Specs: Flowrate and Sample Volume All airborne particle counters sample air at a specified volumetric flowrate, or ...


    By Particle Measuring Systems

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