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Greetings,
Welcome to Cross Instrumentation's CI-Journal. The CI-Journal
Series has been created, written and distributed to our customers for
use primarily as a learning tool. Our intent is not to burden you with
another advertisement for our products, rather to educate you on
them... Their purpose, their design & construction, advantages
& disadvantages and finally some typical & not so typical
applications. Over the next 12 months we'll be distributing a series
of CI-Journals, each with a specific focus pertaining to industrial
process measurement and & control. First up... Flow Measurement
Whether your application calls for rate of flow, totalization or
even a batching process, it's imperative that you begin your search
for a flowmeter. by choosing the correct sensor type. A flow
measurement system is only as good as the performance of the selected
sensor in a specific application, and the compatibility of its sensor
with the process fluid. In this edition of the CI-Journal, we'll focus
on four of the most popular forms of flow measurement: Turbines,
Thermal Mass Flow, Magnetic and Oval Gear flowmeters.
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this issue... |
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| Turbine
Flow Meters for Liquid Measurement |
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The
turbine meter is a volumetric measurement device which operates by
sensing the linear velocity of the fluid passing through it. Using
a known cross-sectional area of the meter housing enables it to
determine the volumetric flow rate.
As fluid passes through the meter, it conveys an angular
velocity (RPM) to the rotor, which is proportional to the linear
velocity of the flowing fluid. Since the linear velocity of the
flowing fluid though a given area is directly proportional to the
volumetric flow rate, it follows that the speed of rotation of the
rotor is directly proportional to the volumetric rate.
Learn
more about Turbine Style Flowmeters... »
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| Thermal
Mass Flowmeters |
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Thermal
Mass Flow Meters are based on an operational principle that states
that the rate of heat absorbed by a flow stream is directly
proportional to its mass flow. As molecules of a moving gas come
into contact with a heat source, they absorb heat and thereby cool
the source. At increased flow rates, more molecules come into
contact with the heat source, absorbing even more heat. The amount
of heat dissipated from the heat source in this manner is
proportional to the number of molecules of a particular gas (its
mass), the thermal characteristics of the gas, and its flow
characteristics..
Learn
more about Thermal Mass Flowmeters... »
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| Magnetic
Flowmeters |
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Magnetic
Flowmeters are based on Faraday's Law of Magnetic Induction.
According to Faraday's Law, the flow of a conductive liquid
through the magnetic field will cause a voltage signal to be
sensed by electrodes located on the flow tube walls. When the
fluid moves faster, more voltage is generated. Faraday's Law
states that the voltage generated is proportional to the movement
of the flowing liquid.
Huh?
Faraday's Law in Plain English... »
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| Positive
Displacement - Oval Gear Meters |
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Oval
Gear meters are a member of the Positive displacement flowmeter
family. They operate by repeatedly filling and emptying
compartments of a known volume with a liquid. The flowrate is then
calculated based on the number of times these compartments are
filled and emptied.
Learn
more about Oval Gear Meters... »
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CI-Solutions
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| Gas
Sub-Metering / Utility Auditing
In any industry, finding a better means to monitor and control
your operating expenses is one sure way to improve your
competitive position.
The ability to monitor the actual amount of gas entering your
facility and to accurately track it's use throughout the
individual areas of consumption, can give you the information you
need to adjust for peak usage and to correctly assign costs when
reviewing general operating expenses and specific product
profitability.
Find
out more....
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