current flow meter Articles

  • Airborne particle measurements: 100 LPM vs. 1 CFM particle counters in a semiconductor cleanroom environment

    Abstract Many current standards define airborne particle monitoring in units of particles-per-cubic-meter (particles/m3). Often, these standards require sampling an entire cubic meter (1 m3) to provide an accurate measurement of airborne particulate levels. Using a conventional aerosol particle counter that samples 1-cubic-foot per minute (1 CFM) requires more than 35 minutes to sample 1 ...


    By Particle Measuring Systems

  • EA Framework ADCP

    Hydro-Logic have lead the introduction of ADCP technology into UK hydrometric practice, and have been exclusive distributors in the UK and Ireland for Teledyne RDi ADCP instruments since 2002. Subsequently, the EA appointed Hydro-Logic to a National Framework Contract for the supply of ADCP equipment. Hydro-Logic have since sold hundreds of profilers for both current meter gauging and continuous ...

  • Scottish Environment Protection Agency (SEPA), 2004 - 2005 case study

    Supply and installation of flood warning system Supply of 12 no. Hawk XT telemetry loggers for use with tipping-bucket rain-gauges plus supply and installation of 6 no. telemetered flow gauges to the SEPA west area as part of a flood warning instrumentation project. Each flow gauge was comprised of a Teledyne RDi Channelmaster H-ADCP with a Hawk XT outstation.  The Isodaq FEP6 telemetry ...


    By Hydro-Logic Services

  • Low Cost Flood Warning Solution

    Scottish Environment Protection Agency (SEPA) Supply and installation of flood warning system Supply of Hawk XT telemetry loggers for use with tipping-bucket rain-gauges plus supply and installation of telemetered flow gauges to the SEPA west area as part of a flood warning instrumentation project. Each flow gauge was comprised of a Teledyne RDi Channelmaster H-ADCP ...

  • A step closer toward maintenance-free gear

    Abstract—A difficult-to-predict electrical failure is the continuity failure. Pressure junctions are common problem sources for continuity failures. Available tools to search for pressure-junction problems include low-resistance testing, temperature monitoring using physical contact between sensor and heated part, pyrometer temperature monitoring, infrared photography, and visual ...


    By Eaton Corporation

  • Core technology part 3: thermal--multivariable mass vortex

    In 1997, Sierra Instruments took proven vortex shedding technology to the next level with the launch of the Innova-Mass® Model 240 & Model 241 Multivariable Mass Vortex Flow Meter. Sierra was the first to offer this unique solution for measuring the mass flow of gases, liquids and steam. Vortex shedding flow meters have been in use for many years. The typical device is a flanged in-line ...


    By Sierra Instruments, Inc.

  • Industrial thermal mass flow meters Pt.1 -Pt.2 - measurement & control

    An industrial thermal mass flowmeter measures either the mass velocity at a point in a flowing gas or the total mass flow rate through a channel or pipe. Figure 1 shows a typical thermal mass flow sensing element. It consists of two sensors: a mass flow sensor and a temperature sensor, which automatically corrects for changes in gas temperature. Both sensors are reference- grade platinum ...


    By Sierra Instruments, Inc.

  • Conductivity Theory and Measurement

    Electrical conductivity is a measure of the ability of a solution to cany* a current. Current flow in liquids differs from mat in metal conductors in that electrons cannot flow freely, but must be carried by ions. Ions are formed when a solid such as salt is dissolved in a liquid to form electrical components having opposite electrical charges. For example, sodium chloride separates to form Na" ...


    By IC Controls Ltd.

  • Purifying wastewater with Peristaltic Industrial Tube Pumps - Case Study

    The Challenge A leading multi-national electronics company with numerous plants across South Korea has for many years been using Metering pumps for dosing Aluminium Sulphate in their wastewater treatment facilities. The plant engineers approached the local Verderflex distributor Dong-Il Ent Co Ltd, looking for a solution to the following problems ...

  • Heat From Wastewater

    When it comes to using wastewater heat from channels, provision and evaluation of hydraulic and thermal wastewater data is urgently needed prior to planning and implementation of facilities. Knowing the wastewater temperatures as well as the flow rates - particularly as dry weather discharge – is an indispensable component. It is therefore essential to carry out preliminary measurements ...


    By NIVUS GmbH

  • OTT ADC measurement - Germany

    Background As the open pit Cottbus Nord is making use of the water of the ponds in the protected landscape of Lakoma (a village 6 km from Cottbus) the Vattenfall Europe Mining AG (VEM) as owner of the pit was obligated to take compensation measurements. VEM entrusted the engineers of the gerstgraser Ingenieurbüro für Renaturierung (gIR) in Cottbus with the planning of the ...


    By OTT HydroMet

  • Coupled ADCPs can yield complete Reynolds stress tensor profiles in geophysical surface flows

    We introduce a new technique to measure profiles of each term in the Reynolds stress tensor using coupled acoustic Doppler current profilers (ADCPs). The technique is based on the variance method which is extended to the case with eight acoustic beams. Methods to analyze turbulence from a single ADCP rely on questionable assumptions on turbulence anisotropy ratios and on the requirement of ...


    By Teledyne RD Instruments

  • Online discharge measurement with horizontal doppler-flow sensor

    Background The regional authority responsible for the barrages in the Free State of Saxony is in charge of the water management of the Rötha. Reservoir. This reservoir is situated close to the river Pleiße, from which the water is led over a weir into the reservoir.. Knowledge about the inflows of the reservoir is important for the water management there. So far, the ...


    By OTT HydroMet

  • Discharge Measurement in a Short Intake with a Converging Section – a Case Study

    In the context of a planned retrofit and upgrade of the hydropower plant Wettingen, operated by the Elektrizitätswerke Zürich, three intakes were equipped with acoustic transit time flow measuring devices. Since the flow meters are installed in a converging section, downstream of a pier, it became necessary to perform numerical flow simulations in order to weight the acoustic path ...


    By HydroVision GmbH

  • 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 ...


    By Sierra Instruments, Inc.

  • Flowmeter Portable Handhold Ultrasonic Flow Meter

    The Technologists from A.YITE Electronic(America) Laboratory, have done much efforts to design portable ultrasonic flowmeter, we would like to supply suitable measurement for the travelling engineer.  There is no moving part in the EU-109H ultrasonic instrument, which is a kind of movable and reliable static instrument. With its accuracy up to 0.8% and comparatively large dynamic ...


    By A.YITE Technology

  • Abha water utility comes out on top with automated control valves

    Abha is a small modern city in the fertile mountains of southwestern SAUDI ARABIA. Its cool summers make it a popular destination for tourists, but in general the population hovers around 250,000. The city has a new reservoir on top of a hill that releases water through 6 km of piping down to its main Noaman reservoir. The top tank is 100 meters higher than the lower tank. This makes for a great ...


    By Singer Valve Inc.

  • Balancing Wetland Regulation with Stormwater Management on a Watershed-Wide Basis: A Case Study.

    Maryland reconciles rapid growth, water-quality goals, and habitat protection. In response to increasing regulatory authority over its water resources, the Maryland Department of the Environment (MDE) has combined various programs and processes into a 'one-stop shop' where various issues can be addressed in a uniform and consistent manner. As part of this process, onsite conditions are assessed, ...

  • Generation-next mass flowmeter arrives

    This vortex mass flow device directly measures three parameters. Then, it computes seven more properties of liquids, gases, and steam. The next generation of mass flowmeters offers improved accuracy, lower installed cost, and enhanced functionality, including multiple outputs of process conditions. The multiparameter How vortex mass flowmeter (MVMF) was developed to reduce total cost ...


    By Sierra Instruments, Inc.

  • Thermally Enhanced Soil Vapor Extraction

    Introduction Thermally enhanced SVE is a full-scale technology that uses electrical resistance/electromagnetic/fiber optic/radio frequency heating or hot-air/steam injection to increase the volatilization rate of semi-volatiles and facilitate extraction. Thermally enhanced SVE is normally a short- to medium-term technology. Electrical Resistance Heating Electrical resistance heating uses ...

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