calibration system Articles

  • How a contract research lab advanced its polymer characterization capabilities

    Realizing the Advantages of Ultra-High-Performance Size Exclusion Chromatography Compared to GPC Intertek is a global provider of quality and safety services designed to help businesses improve products, assets and processes, overcome market constraints and reduce risks. From auditing and inspection, to testing, training, and certification, Intertek enables customers to meet end ...


    By Waters Corporation

  • 10 Reasons why you should continuously monitor low temperature and liquid chemical sterilants for worker safety

    1. Sterilant chemicals are highly toxic Low temperature and liquid chemical sterilants are designed to kill all microorganisms including resistant spores and if they were not toxic, they would not be effective in sufficiently high concentration to destroy all microbial life including the chemically resistant sporicidal forms of certain ...


    By ChemDAQ, Inc.

  • Automatic calibration saves big

    Automatic gas sensor calibration technology was developed by Rel-Tek and proven over a decade of industrial applications involving large alternative fuel, transit bus garages.  CNG, LNG, LPG and hydrogen fuels present the possibility of explosive gas buildup indoors, so sustaining the accuracy of the installed gas monitoring system is a never-ending responsibility for the owner.  ...


    By Rel-Tek Corporation

  • Free-field calibration in China

    Practically all reference microphone calibrations that are performed by national metrology institutes are pressure response calibrations. This is the case even if most practical measurements are carried out under free- or diffuse-field conditions. Fortunately, for measurement microphones, there are essentially fixed ratios between the pressure-, free- and diffuse-field responses. Therefore, the ...

  • Calibration and characterisation of extremity dosimeters

    The increasing use of radiation in the medical field is providing great advances in health improvement. However, these techniques can generate an increase in the number of professionals exposed to radiation. The Brazilian authorities (Brazilian Nuclear Energy Commission ? CNEN) have imposed the monitoring of specific body parts of professionals. One of these obligations is the monitoring of the ...


    By Inderscience Publishers

  • Why calibrate PULSE?

    This famous remark emphasises the importance of measurement in the world of science, industry and commerce. We all use and depend on it daily, in even the most mundane aspects of life – from setting your wristwatch to the radio time signal, to filling the car fuel-tank, or checking the weather forecast. All of these things depend on proper calibration and traceability to national and ...

  • Design of a Large Calibration Chamber

    The design and operation of a conceptually simple, low-cost chamber for calibration of cone penetrometers and other in situ devices is described. The chamber weighs over 5500 kg and houses a 4400-kg soil sample that is 1.5 m in diameter and height. Operations in the chamber are automated using a self-equilibrating hydraulic insertion frame, a soil pluviation system for sand placement, a vacuum ...


    By ASTM International

  • A Calibration Chamber for Cohesive Soils

    The paper describes the design and performance of a calibration chamber system for testing in-situ test devices in cohesive soils. Techniques for preparing “undisturbed” clay specimens from a slurry and consolidating them under zero lateral strain K0 conditions are presented. The chamber was used for strain controlled model pressurementer tests during which pore pressure was monitored. Duplicate ...


    By ASTM International

  • Recommendations for Implementing a Calibration Program

    Introduction This article is limited to the principles of organization for calibration work in relation to cGMP and other pharmaceutical standards. Calibration and metrology methods related to actual calibration techniques, statistics, and theories are not explored in our discussions.1 Each class of instruments requires specific techniques and approaches to achieve stated accuracies. All ...


    By Prime Technologies, Inc.

  • Calibration – the sure way to accurate measurements

    Calibration   During testing, microphones and accelerometers can change sensitivity or break. They might look intact, but what happens if you continue measuring without having calibrated your transducer? Can you trust your data? Do you have to redo the entire test? In cases of extreme testing you might only have one shot at getting your measurement right as the product gets ...

  • The Cost of Inaccurate CEM Calibration Gases

    Utility companies and other users of Continuous Emissions Monitoring (CEM) calibration gases often mistakenly consider them a commodity, making price the primary purchase consideration. Consequently, many are willing to settle for calibration gases that are ...

  • A Profiling System in Amazonia with Automatic Calibration based on the CIRAS-SC Analyzer

    Amazonia constitutes a large global store of carbon. Forest conversion in Amazonia is a net source of carbon to the atmosphere, while recent measurements indicate that undisturbed forest systems may be a net carbon sink. The importance of sequestration of carbon in regrowing forest and abandoned lands is unclear. These issues represent uncertainties in the global carbon balance and may influence ...


    By PP Systems

  • Water distribution system model calibration under uncertainty environments

    The calibration process of water distribution system models allows for accurate and reliable hydraulic analysis results. Thus, calibration is of utmost importance if adequate operation and maintenance model-based procedures are sought. However, in emerging economies, there is a series of factors that make it more difficult to construct accurate models, including very poor information management, ...


    By IWA Publishing

  • On data requirements for calibration of integrated models for urban water systems

    Modeling of integrated urban water systems (IUWS) has seen a rapid development in recent years. Models and software are available that describe the process dynamics in sewers, wastewater treatment plants (WWTPs), receiving water systems as well as at the interfaces between the submodels. Successful applications of integrated modeling are, however, relatively scarce. One of the reasons for this ...


    By IWA Publishing

  • System dynamics and auto-calibration framework for NSM model: Murrumbidgee River

    Water sharing management is the major problem for water resources and irrigation management decision makers. However, irrigation systems are very complex and interconnected, posing significant difficulties in managing irrigation economically and environmentally. Therefore, it is imperative that innovative modelling approaches are employed to deal with the feedback loops inherent in these systems. ...


    By Inderscience Publishers

  • Pipe roughness calibration in water distribution systems using grey numbers

    This paper presents a procedure based on the use of grey numbers for the calibration (with uncertainty) of pipe roughness in water distribution systems. The pipe roughness uncertainty is represented through the grey number amplitude (or interval). The procedure is of a wholly general nature and can be applied for the calibration (with uncertainty) of other parameters or quantities, such as nodal ...


    By IWA Publishing

  • Development of method for X-band weather radar calibration

    Calibration of the X-band LAWR (Local Area Weather Radar) is traditionally based on an assumed linear relation between the LAWR radar output and the rainfall intensity. However, closer inspection of the data reveal that the validity of this linear assumption is doubtful. Previous studies of this type of weather radar have also illustrated that the radar commonly has difficulties in estimating ...


    By IWA Publishing

  • Intelligent manipulation and calibration of parameters for hydrological models

    It would be greatly helpful to neophytes if knowledge-based system technology incorporating the existing heuristic knowledge about model manipulation can be integrated into the hydrological system. This paper delineates the development and implementation of a prototype knowledge-based system for model manipulation for hydrological processes by employing an expert system shell. The architecture ...


    By Inderscience Publishers

  • Environics - Reducing calibration gas cost by up to 60%

    EPA's appendix 'M' 40 CFR 51 reduces calibration gas cost by 60%By: Terrence P. Dunn, President of EnvironicsOn May 30, 1995, the EPA published the final version of Method 205 for inclusion in Appendix M of 40 CFR Part 51 entitled, 'Verification of Gas Dilution Systems for Field Instrument Calibrations.' Continuous emissions monitoring systems (CEMS) require ...


    By Environics, Inc.

  • Pressuremeter Creep Testing in Ice: Calibration and Test Procedures

    In situ pressuremeter creep tests of ice require that particular attention be paid to the precision with which the borehole diameter is measured because failure of ice often occurs at strains as small as 1%. Therefore, precision is important to obtain an accurate picture of the stress-strain-time response of the ice before failure. Also, the pressure applied to the ice must be known precisely ...


    By ASTM International

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