flow calibrator Articles

  • Flow Calibration Best Practices

    We held a webinar on thermal mass flow meter / controller calibration best practices. Topics included: Equipment Techniques and Tips Record Keeping / Documentation If you are interested in calibrating in-house or using a third party then be sure to watch this webinar presented by Teledyne Hastings Instruments and guest speaker Jaime Shanahan of Chell Instruments, Ltd. Teledyne ...

  • Environics - Full-scale error vs. Setpoint error

    A flow controller's accuracy is typically expressed as a percent of Full-Scale flow (%FS). This means that the flow controller is most accurate when operating at its rated full-scale flow rate. This also means that its accuracy, expressed as a percent of Setpoint, drops off significantly when operating at lower flow rates. For example, a 1000 cc/min flow controller with a +/- 1%FS accuracy, ...


    By Environics, 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 sensor drift from the factory calibration. ...


    By Sierra Instruments, Inc.

  • 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 event is ...


    By F&J SPECIALTY PRODUCTS, INC.

  • New Developments in Thermal Dispersion Mass Flow Meters: In-The-Field Compensation for Changes in Natural Gas Composition

    Introduction The flow of natural gas in pipelines is often complicated by changes in the composition of the gas. The method described in this paper solves the problem of variable composition via a new four-temperature mass flow sensor. The new (low sensor feeds its measurements into the algorithms of an advanced mathematical model that includes gas properties in its calculations. The method ...


    By Sierra Instruments, Inc.

  • A Tale of Two Thermals: Capillary & Immersible

    About: The Core Technology White Paper Series is a four part series detailing the flow technologies that allow Sierra to offer a flow solution for nearly any gas, liquid and steam application. Part 1 focuses on Sierra’s two types of thermal mass flow technologies for gas mass flow measurement and control—Capillary Thermal & Immersible Thermal. Part 2 will focus on our ...


    By Sierra Instruments, Inc.

  • 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 paper, the following definitions shall apply: Gas of ...

  • Evaluation of the causes of inundation in a repeatedly flooded zone in the city of Cheongju, Korea, using a 1D/2D model

    Currently, unprecedented levels of damage arising from major weather events have been experienced in a number of major cities worldwide. Furthermore, the frequency and the scale of these disasters appear to be increasing and this is viewed by some as tangible proof of climate change. In the urbanized areas sewer overflows and resulting inundation are attributed to the conversion of previous ...


    By IWA Publishing

  • Advances in Thermal Dispersion Mass Flow Meters - Part 2 Installation and Flow Calibration

    Abstract Part 1 of this two-part series describes the principle of operation of a new microprocessor-based thermal dispersion mass flow meter that uses four temperature sensing elements in its flow sensor and has a dry velocity sensor. Part 1 shows how this unique system provides automatic management of changes in gas selection, gas temperature, gas pressure, and outside temperature. This Part 2 ...


    By Sierra Instruments, Inc.

  • Combining modeling and monitoring to study fecal contamination in a small rural catchment

    The present study sought to identify Escherichia coli sources in a small catchment and to use the agro-hydrological model soil and water assessment tool (SWAT) to estimate their impact on river water quality. The innovative aspects of this research are to assess the hourly variations of fecal contamination and to take these variations into account in the model to provide a better evaluation of ...


    By IWA Publishing

  • Your complete flow energy solution is here

    Flow meter technologies designed, built and calibrated in California by Sierra. For what we call our Big-3, Sierra has become a recognized expert in thermal mass (QuadraTherm®), vortex shedding (InnovaMass®), and transit-time ultrasonic (InnovaSonic®). Sierra is the only company in the USA to design, build and calibrate all three flow technologies. The Big-3 are optimized to be a ...


    By Sierra Instruments, Inc.

  • Experiences from a round Robin test for flue gas temperature, volume and flow measurements

    ABSTRACT In Flanders, laboratories, recognised for emission measurements in the framework of the environmental legislation (Vlarem II), have to implement a quality system that meets the requirements of EN 45001 and are forced to participate in external quality controls organised by AMINAL, the Flemish Administration for environment and/or the reference laboratory for air measurements, e.g. Vito ...

  • Modeling and evaluation of compliance to water quality regulations in bathing areas on the Daoulas catchment and estuary (France)

    The microbiological quality of waters in estuaries determines their acceptability for recreational uses. Microbiological contamination often results from urban wastewater discharges or non-point source pollution (manure spreading), and can cause bathing zones to be closed. European regulations (EC/7/2006) have proposed standards (500 E. coli/100 ml) for the acceptability areas for bathing. In ...


    By IWA Publishing

  • Selection of capillaries for the production of Equal Capillaries Type Diluters

    In the manufacturing process of glass capillaries the internal diameter (capillary hole) necessarily has a certain tolerance and therefore presents a certain dispersion, which is normally specified in the purchase order. When a batch of capillaries is used as a "calibrated flow resistance", the induced flows may be calculated depending on the fourth power of the diameter and the dispersion of the ...


    By Be.T.A. Strumentazione Srl

  • Mass Flow Controller Calibration Report - What Does it Mean?

    In this short blog, we are going to look at one of our mass flow controller calibration reports and discuss some of the terms that you will see. There is good information at the bottom of these reports, so let’s jump in and take a closer look… At the bottom of every one of our calibration data sheets, you will see the following statement: This calibration complies with ANSI/NCSL ...

  • Comparison of short-term rainfall forecasts for model-based flow prediction in urban drainage systems

    Forecast-based flow prediction in drainage systems can be used to implement real-time control of drainage systems. This study compares two different types of rainfall forecast – a radar rainfall extrapolation-based nowcast model and a numerical weather prediction model. The models are applied as input to an urban runoff model predicting the inlet flow to a waste water treatment plant. ...


    By IWA Publishing

  • Uncertainties of inverse transient modelling with unsteady friction and pipe-wall viscoelasticity

    The current paper aims at the discussion of the uncertainties of hydraulic transient modelling using the classic method of characteristics and incorporating unsteady friction (UF) and pipe-wall viscoelasticity. A two-stage calibration procedure is used for estimating the model parameters: the first stage refers to the calibration of steady state conditions and the second stage to the ...


    By IWA Publishing

  • Advances in Thermal Dispersion Mass Flow Meters - Part 1 Principle of Operation

    Abstract This paper describes an advanced microprocessor-based thermal dispersion mass flow meter that uses four temperature sensing elements in its flow sensor instead of the traditional two elements and has a dry velocity sensor that uses no potting materials instead of the traditional potted velocity sensor. This unique new mass flow meter automatically manages changes in gas selection, gas ...


    By Sierra Instruments, Inc.

  • New Video: Master Your Mass Flow Control Challenges

    For over 40 years, Sierra has pioneered the development of precision gas mass flow controllers. Today, our high-performance SmartTrak lineup, with over 100,000 successful installations, proves we’ve never let up. For Lab Researchers and Systems Integrators/OEMs, SmartTrak is often called the Swiss Army Knife of gas mass flow controllers. Find out why in our new video. The SmartTrak ...


    By Sierra Instruments, Inc.

  • 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 calibration during compliance audits ...


    By Environics, Inc.

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you