mass flow meter Articles
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FAQ Corner – What is turndown ratio?
We are occasionally asked for the turndown ratios of our flow meters and flow controllers. There are varying perceptions as to what this term actually means. The turndown ratio of a Mass Flow Meter (MFM) or Mass Flow Controller (MFC) defines the usable range for which it can operate while maintaining its published accuracy. It can be expressed using the following formula: A flow meter ...
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Capillary Tube Thermal Mass Flow Meters & Controllers - A User`S Guide - White Paper
Abstract Capillary tube thermal mass flow meters directly measure the mass flow rate of clean gases and gas mixtures in lower flow ranges. A capillary tube thermal mass flow controller adds an integrally mounted flow control valve to the flow body of the mass flow meter and bom monitors the mass flow rate and controls it to be equal to a set-point value selected by the user. This paper ...
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New Developments in Thermal Dispersion Mass Flow Meters
Introduction This paper describes a newly developed microprocessor-based thermal dispersion mass flow meter that uses four temperature sensing elements in its flow sensor instead of the traditional two elements and automatically manages changes in gas selection, gas temperature, gas pressure, and outside temperature. This new mass flow meter is ideally suited for apportionment applications in ...
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How to Specify the Best Mass Flow Meter or Controller for Your Application
A question we get a lot from our customers is how to determine which Sierra mass flow meter or mass flow controller is best for their application. Followed up by: What’s the difference between an economical mass flow controller and a premium mass flow controller. Our new video explains the differences between Sierra’s economical and premium mass flow meters and controllers (our ...
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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 ...
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Applications guide to mass flow measurement in the primary metals
Mass flow meters can provide precision measurement and control of proccss gases in many phases of plant operation. They make processes more repeatable and provide greater control over quality and costs. Sierra mass flow meters were designed for these purposes. They can make any plant more cost-effective in several ways: Aluminum Purification: Automated Gas Flow Control The last step before ...
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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 ...
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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 ...
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It’s a sensor game
From Sierra’s beginning over 40 years ago, founder Dr. John G. Olin was driven by the vision of supplying industrial customers with the world’s most accurate mass flow meter. And, he knew it was a ‘sensor’ game. With a background – and Ph.D. – in mechanical engineering and specialised in fluid mechanics and heat transfer, Olin was a driven innovator and ...
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Delivering mission critical for NASA – Case Study
Early developments in the evolution of mass flow meters in the 1950’s were largely driven by the need for highly accurate readings. Over the last 50 years the demand for substantially reduced margins of error has only intensified. For the last 25 years, NASA has relied on the accuracy of Sierra's SideTrak® 830/840 thermal mass flow meters to get the right mixture of nitrogen, argon ...
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Mass flow sensing improves leak test efficiency
Mass flow meters reduce risk of measurement error and provide a reliable, quantitative measurement of product quality and production process control. In the leak testing application, mass flow meters offer advantages unmatched by other instruments. Today, leak testing must be not only precise, accurate and irrefutable, but also easy-to-use, fast and efficient. With mass flow sensing, dry air ...
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Desired Characteristics of a Thermal Mass Flow Sensor - Part 1 of 2
This is part 1 of a 2 part blog on Thermal Mass Flow Sensor. We will describe the desired characteristics of a thermal mass sensor in Part 1 and Part 2 will discuss the operation of the 300 Series flow sensor (Patent #6,125,695) from Teledyne Hastings. A thermal mass flow meter consists of the following: Electronic Circuit Card Flow Sensor Bypass Shunt Base A cutaway is shown in the ...
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Tech Note: Flare Gas Measurement Innovation; Retain Flow Metering Accuracy Even if Gas Composition Changes
It’s a fact oil wells almost always produce natural gas along with the petroleum. Nine times out of ten, the excess gas (typically hydrocarbons) is flared off or simply vented as-is during upset conditions in the process. The environmental impacts of “flaring” this excess gas into our atmosphere has resulted in government regulations like 40 CFR Part 60 Subpart OOOO (also known ...
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Thermal mass flow meter for Compressed air solution - Case study
iCenta delivered the IC-MCF Air Flow Meter complete with ancillary accessories. The IC-MCF air flow meter is indispensable for managing energy use with compressed air / nitrogen up to 12000 L/min (normal). The inexpensive mass flow meter provides precision and wide rangeability as a result of being micro-machined, integration of a micro-flow sensor and advanced channel-design technology. The ...
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The evolution of thermal mass flow meters
Who were some of the pioneers in thermal mass flow technology? A. Thermo-Systems, Inc. (TSI) began in its founder’s basement in 1959, with a cooled-film anemometer designed for transient measurements in high temperature fluid flows. This led to TSI’s hot-film and hot-wire anemometers, the first commercial products of this type. These immersion-type devices were used mainly as ...
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Applications guide to mass flow measurement in the pulp & paper industry
Rising costs and tighter emission control requirements have created a need for information that is more useful and precise. Sierra thermal mass flow meters fill this need and support cost-effective mill management in die following applications: Increased Boiler Efficiency Mills need to measure the How of combustion air to the recovery or power boiler to provide accurate air flow signals during ...
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Cultivating geothermal energy sources – Case Study
Since the early twentieth century, geothermal energy has been used to produce electricity. In the 1980’s and 90’s, rapid expansion in the demand for geothermal energy put pressure on suppliers to reduce costs and increase efficiencies. Because of high temperatures and varying pressures, measuring steam flow through "Differential Pressure" methods was fraught with inconsistencies. ...
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Flare Gas Measurement Innovation: Retain Flow Metering Accuracy Even if Gas Composition Changes
It’s a fact oil wells almost always produce natural gas along with the petroleum. Nine times out of ten, the excess gas (typically hydrocarbons) is flared off or simply vented as-is during upset conditions in the process. The environmental impacts of “flaring” this excess gas into our atmosphere has resulted in government regulations like 40 CFR Part 60 Subpart OOOO (also known ...
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Increase biogas production, aeration basin efficiency with the right flow meter
In our competitive economic climate, many plant operators have a mandate to tune their plant’s performance by efficiently using biogas in cogeneration processes and increasing aeration basin efficiency, both of which can save thousands of dollars in the critical secondary stages of wastewater treatment. In many cases, these facilities are retrofitting with new flow measurement ...
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In-Situ Calibration - Methods & Pitfalls of Thermal Mass Flow Meter Sensor Field Validation
Introduction Mid-to-large size facilities and campuses inevitably have hundreds of ¬ ow instruments to monitor, maintain, and repair. For a reliability engineer, ensuring that all instrumentation meets ISO 9000 or similar standards is a time-consuming responsibility. These standards mandate that precision instrumentation needs to be checked (validated) or recalibrated as often as once a year. ...
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