sampling system Articles

  • Automated Consignment Sampling Systems

    Introduction The following is a case study where consignment sampling has been implemented at a UK coal fired power station. Bias-Free Sampling The production of consistent and repeatable ‘bias-free’ samples is not possible but all international sampling standards give precise limits within which systems can be considered as being ...


    By Eriez Magnetics Europe Ltd

  • Use of Diaphragm pumps in Sampling systems

    INTRODUCTION Sample system design can take many forms, influenced by factors including cost, size, maintenance, source conditions, and analyzer requirements – to mention a few. The following discussion takes into account the operating characteristics of a diaphragm pump, and choices that will improve system performance, reduce measurement errors, and lower pump maintenance. Illustrated below are ...


    By Air Dimensions Inc

  • Partial Flow Sampling System For Transient Engine Testing

    For on-highway engine manufacturers, meeting model year 2007 emissions levels represents a major measurement challenge. However, future off-road engine emissions testing requirements are anticipated to include not only lower steady-state emissions levels, but also the possibility of using transient cycle data. As a result, engine manufacturers are seeking more cost-effective methods of ...


    By Sierra Instruments, Inc.

  • Sample System Best Practices for Water and Hydrocarbon DP Applications

    Abstract Sampling techniques for BTU and moisture measurements are well understood but applications beyond the routine requires additional attention to detail. Two such applications are the subject of this paper. The first is the measurement of low level moisture (1 – 1,000 ppbv) for cryogenic processes. Measuring moisture below 1 ppm is an entirely different world from the traditional ...

  • Technical Bulletin: Multilevel Sampling

    The topic of this CL:AIRE Technical Bulletin is multilevel sampling systems for characterising contaminated groundwater. Contaminated groundwater can present considerable problems for landowners: it can occur at significant depth, sources of the contamination are not often obvious, it can migrate from one property to another, and groundwater flow directions can be altered due to seasonal ...


    By Solinst Canada Ltd.

  • Area Monitoring: Diffusion Sampling

    Indoor and outdoor gas hazards that exist in open areas are usually monitored using diffusion-type sensors. A diffusion sensor has no active sample-drawing system; diffusion sensors rely on the ambient air movement and pressure to deliver the sample to the sensing element. Diffusion-type sensors are a reliable and cost-effective way to monitor open area gas hazards. When installing diffusion ...

  • Biodegradation Tests for Wastewater Samples

    Biodegradation Tests for Wastewater Samples Biodegradation tests usually involve comparison of the oxygen uptake of a test sample – or gas production for anoxic or anaerobic tests – to that for a readily biodegradable control substrate (usually acetic acid, ethanol, or aniline). While biodegradation characteristics can vary among chemical types and wastewater sources, typical patterns are shown ...


    By Challenge Technology

  • Oil Sampling Best Practices

    Obtaining a representative oil sample from a closed loop lubrication system is essential to any good oil analysis program. As oil analysis programs become more standardized for routine monitoring, especially within equipment warranty support programs, equipment makers provide more sampling points on new equipment. These ...


    By Spectro Scientific

  • Decontaminating Groundwater Sampling Devices

    These studies are the second part of a two year project that examines decontaminating groundwater sampling devices. In the first year, the efficiency of various decontamination protocols was tested using small test pieces of materials that are commonly used in groundwater sampling devices. Those tests showed that a hot detergent wash and rinse followed by hot air drying (105°C) was the most ...

  • Ground Water Sampling - A Workshop Summary

    Monitoring purposes have evolved in the past decade reflecting an increasing emphasis on assessment and remedial action performance over detection monitoring. The recognition of many potential contamination sources as well as the regulatory inclusion of a large number of sites in need of investigation have spurred this evolution in practice. New more efficient methods and tools for ...

  • Occurrence of Aeromonas spp. in a random sample of drinking water distribution systems in the USA

    Aeromonads are aquatic bacteria found in drinking water supplies worldwide. Some species, such as Aeromonas hydrophila, can cause disease in humans. For this survey, 293 United States public water systems were selected using random sampling, stratified by water source and system type. Water samples were collected during one year from three sites (six samples per site) in each system. Temperature, ...


    By IWA Publishing

  • Air Sampling During NPP Accident

    There has been considerable interest recently generated regarding emergency air sampling protocols as a result of the Fukushima accident in Japan. A major concern involving air sampling requirements is the accurate determination of gaseous-radioactive iodine species emitted from the NPP to the environment as a result of an accident. During normal NPP operation gaseous radioactive iodine ...

  • Setting the standards for headspace sampling by PID

    The responsiveness of PIDs to virtually all VOCs has seen them become the accepted tool for initial site entry assessment, ensuring optimal detection of unknown and often toxic or hazardous chemicals found at hazardous waste sites and chemical emergencies. The speed and accuracy of modern PID equipment means that many worker and community safety concerns during initial and ongoing operations can ...


    By Ion Science Ltd.

  • Ground Water Sampling for Metal Analyses

    The Regional Superfund Ground Water Forum is a group of ground-water scientists, representing EPA’s Regional Superfund Offices, organized to exchange up-to-date information related to ground-water remediation at Superfund sites. Filtration of ground-water samples for metals analysis is an issue identified by the Forum as a concern of Superfund decisionmakers. Inconsistency in EPA Superfund ...

  • Groundwater: Low-flow Purging and Sampling

    Significant timesavings, improved sample process integrity, quality assurance and minimal quantities of potentially contaminated purge water to manage - are attractive as the focus on groundwater quality sharpens and economics demand best cost-benefit based methods Water has become a vitally important resource.  Maintaining its quality and quantity and avoiding pollution are set to be ...

  • Joint estimation of hydraulic conductivities of two sand samples in a W-tube system with a bi-exponential response

    The motivation for this paper is the practical problem of interpreting bi-exponential rate-of-rise curves that are observed during many field piezometric tests. In the authors' previous study, a laboratory W-tube system of water flow through two samples of sand was introduced with an adequate mathematical model. The desired bi-exponential character of water flow was obtained by placing two ...


    By IWA Publishing

  • Leader in sample preparation systems benefits from Axetris MFCs’ high dynamic range - Case Study

    Split ratio flexibility of GC injector increased 30-fold A leading manufacturer of analytical sample preparation systems in gas chromatography (GC) switched to Axetris MFCs - and in doing so, simplified their product range, while offering their customers at least 30 times more flexibility in split ratio. The market-leading dynamic range of Axetris mass flow controllers (MFCs)—with ...


    By Axetris Ag

  • Two innovative devices for depth sampling in granular filtration systems. Desalination 286: 115–119, 2012.

    Appropriate devices for obtaining either interstitial water or grain particle samples or for measuring dissolved oxygen (DO) at depth within the interior of large-scale, industrial granular bed filters are currently lacking. We developed two innovative samplers for studying a Rapid Sand Filter (RSF) at an operational SWRO plant: the first for water and granular material, the second ...

  • Multilevel Systems

    Untitled Document Introduction A multilevel system is a groundwater monitoring device which allows ...


    By Solinst Canada Ltd.

  • Hitting the Bull`s-Eye in Groundwater Sampling

    Many commonly used groundwater sampling techniques and procedures have resulted from methods developed for water supply investigations. These methods have persisted, even though the monitoring goals may have changed from water supply development to contaminant source and plume delineation. Unfortunately, the use of these methods can result in an incorrect understanding of the contaminant ...

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