flow calibrator Articles

  • What is turbidity?

    Turbidity measures the relative clarity of a water sample. It is determined by the amount of scattering that occurs when a light source is shined through a water sample. Light scattering is caused by increased concentrations of suspended particles in water that are not individually visible to the naked eye, which can give the water a cloudy appearance. This parameter is used as a general ...


    By MANTECH

  • Recent Improvements in Air Flow Calibration Reference Instruments

    A key element in radiation protection programs at commercial nuclear power plants, nuclear research facilities, fuel fabrication plants and regulatory agency oversight programs of licensees is management's ability to validate the accuracy of the many air sampling instruments utilized in the facility's radiation protection air monitoring programs. The volume of air sampled in each sample ...


    By F&J SPECIALTY PRODUCTS, INC.

  • Primary Standard Gas Flow Calibration—The Only Guarantee of Accuracy

    At Sierra, we have a saying: “An instrument’s accuracy is only as good as its calibration.” The accuracy of your mass flow controller (MFC) is essential in assuring the efficiency, performance, and quality of your flow meter. In many cases, if your instrumentation is not calibrated, then a decline in performance is possible due to ...


    By Sierra Instruments, Inc.

  • Valve actuation at the world’s largest flow metering calibration facility - Case Study

    Currently nearing completion, EuroLoop will be the world’s largest test site for industrial flow meters. Two separate circuits are available, for testing both gas meters and liquid meters. Both circuits are fully automated, making extensive use of electric and pneumatic actuators with sophisticated control systems. Situated by the New Meuse River in Rotterdam, EuroLoop will be the ...


    By Rotork

  • Calibration using 5 flow sensors saves the effort of extensive reconstruction measures

    "Abwasserzweckverband Breisgauer Bucht", a municipal association for sewage treatment in the south of Germany, operates a central wastewater treatment plant for its members (29 communities and cities). The WWTP covers a catchment area of 650km² and its treatment capacity is 600.000 population equivalents. The plant is treating wastewater from 375.000 residents as well as from industry and ...


    By NIVUS GmbH

  • The Fundamentals of the Air Sampler Calibration-Verification Process

    INTRODUCTION The calibration of an air sampling instrument using a reference air flow calibrator requires attention to scientific detail in order to establish that the instrument’s reported values are correctly stated and valid under the actual operating conditions of the air sampling instrument. DEFINITIONS For the purposes of this ...

  • 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.

  • Commonly Asked Questions About Calibration Gas

    Argus-Hazco's Becky Schneider answers the most commonly asked questions about calibration gas. The questions range from disposal and refilling protocol to shelf life to MSDS availability. Argus-Hazco offers a complete line of reactive and non-reactive gases in cylinder sizes that range from 17 to 221 liters. We have a large collection of common blends and we can also accommodate virtually any ...


    By Argus-Hazco

  • Specification and calibration requirements for industrial scales in pharmaceutical applications

    Introduction Performance and accuracy of industrial scales in pharmaceutical applications are covered by current Good Manufacturing Practices (cGMPs). Verification of proper operation of process scales is an important factor in finished product Quality Assurance (QA) programs. Incorrect weighing, additions of materials and components in validated processes of formulation, dispensing, and ...


    By Prime Technologies, Inc.

  • Minute Flow Tip Video - Mass Flow Versus Volumetric Flow Technology

    When engineers and systems integrators need to measure gas flow rate in an industrial process or scientific research, there are many types of technologies to choose from.  This makes selecting the right gas flow meter a challenge. In addition to technology, engineers must consider many other parameters: price for value, cost of ownership, size of footprint, ...


    By Sierra Instruments, Inc.

  • Improving calibration of two key parameters in Hydrologic Engineering Center hydrologic modelling system, and analysing the influence of initial loss on flood peak flows

    Parameter calibration is a key and difficult issue for a hydrological model. Taking the Jinjiang Xixi watershed of south-east China as the study area, we proposed methods to improve the calibration of two very sensitive parameters, Muskingum K and initial loss, in the Hydrologic Engineering Center hydrologic modelling system (HEC-HMS) model. Twenty-three rainstorm flood events occurring from ...


    By IWA Publishing

  • Compensation Flow Gauge

    Hydro-Logic have been engaged by Dwr Cymru/Welsh Water since 2000 to operate, maintain and improve their hydrometric network. One of the projects involved the feasibility, design and installation of a new ultrasonic transit-time flow gauge on the discharge compensation flow channel from Cwmystradllyn Reservoir in North Wales. The new gauging station was required to replace a flume which was not ...

  • The Function of an Ultrasonic Flow Meter

    Running a water management operation requires taking a wide range of measurements. In addition to measuring the flow in your system, many systems must measure the water level of their channel, and one of the best tools for accomplishing this goal is an ultrasonic flow meter. ...


    By TRACOM Inc.

  • Sonic nozzles for gas calibrators, when simplicity provides accuracy!

    Gas analyser’s calibration is a task required in many applications according to either legislation or quality systems management. This is the case for Air Pollution Monitoring or Continuous Emissions Monitoring devices installed in cabinets, for continuous analysis in remote locations. Measurements in traces range are performed and analytical devices specifications need to be validated and ...


    By LNI Swissgas SA

  • Does traditional calibration hide errors in your demand analysis?

    Untitled Document A well-calibrated water distribution model can address numerous ...


    By Innovyze

  • Calibration of The LISFLOOD Model For Europe: Current Status And Way Forward

    The hydrological model LISFLOOD model forms the core of the European Flood Alert System (EFAS) and is used for impact studies to evaluate the effect of changes in land use and climate on the hydrological behaviour in catchments across Europe. The accuracy of the model predictions depends on the ability of the model to capture the dominating hydrological processes that transfer precipitation into ...


  • Water distribution network calibration using enhanced GGA and topological analysis

    The calibration of hydraulic models of water distribution networks (WDN) is of preeminent importance for their analysis and management. It is usually achieved by solving a constrained optimization problem based on some priors on decision variables and the demand-driven simulation of the entire network, given the observations of some hydraulic status variables (i.e. typically nodal heads and ...


    By IWA Publishing

  • Impact of sound attenuation by suspended sediment on ADCP backscatter calibrations

    Abstract. Although designed for velocity measurements, acoustic Doppler current profilers (ADCPs) are widely being used to monitor suspended particulate matter in rivers and in marine environments. To quantify mass concentrations of suspended matter, ADCP backscatter is generally calibrated with in situ measurements. ADCP backscatter calibrations are often highly site-specific and season ...


    By Teledyne RD Instruments

  • Integration of Subsurface Data Management and GIS to Facilitate Model Calibration

    Abstract The development of numerical codes, as well as pre- and post-processors to support these codes, has made the discipline of groundwater modelling increasingly more automated and efficient. The value of such modelling is reliant on the site-specific data used to build and calibrate the models. The integration of EarthSoft's EQuISÒ Geology and any of several popular modelling environments ...


    By EarthSoft, Inc

  • Water distribution network quality model calibration: a case study – Ahar

    In water distribution network calibration of quality models, bulk and wall decay coefficients are considered to be the adjustable parameters. The bulk decay coefficient is usually gained by using a laboratory bottle test method, but the wall decay coefficient is calibrated with field data of residual chlorine at nodes. This paper aims to present a method to adjust the wall decay coefficients ...


    By IWA Publishing

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