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Types of Flowmeters |
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Flowmeters Related products |
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| Electromagnetic
Flowmeter |
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Electromagnetic
Magnetic Flowmeter - A conductive process
fluid is run through a magnetic field. As it creates
an electric charge through its interaction with
the field, the charge is measured to find the
speed of the flow. |
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| Featured
Suppliers |
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Customers around the world depend on George Fischer
Signet for quality flow and analytical products
which are simple to operate, and generate reliable
results for all their process requirements. George
Fisher Signet is part of the Georg Fischer Piping
Systems Group based in Schaffhausen, Switzerland,
providing piping solutions for nearly 200 years.
More
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Featured Magmeters suppliers |
| George Fischer Signet
: 2551 Magmeter Flow Sensor |
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The Signet 2551 Magmeter
is an insertion style magnetic flow sensor that features
no moving parts. The patented* sensor design is available
in corrosion-resistant materials to provide long-term
reliability with minimal maintenance costs. Material
options include PP with stainless steel, PVDF with stainless
steel, PVDF with Hastelloy-C, or PVDF with Titanium.
Utilizing the comprehensive line of Signet installation
fittings, sensor alignment and insertion depth is automatic.
These versatile, simple-to-install sensors deliver accurate
flow measurement over a wide dynamic range in pipe sizes
ranging from DN15 to DN300 (0.5 to 12 inches), satisfying
the requirements of many diverse applications.
Signet 2551 Magmeters offer many output options of
frequency/digital (S3L), 4 to 20 mA or relays which
are available on both the blind and display versions.
The frequency or digital (S3L) sensor output can be
used with Signet’s extensive line of flow instruments
while the 4 to 20mA output can be used for a direct
input to PLCs, chart recorders, etc. Both the 4 to 20
mA output and digital (S3L) sensor interface is available
for long distance signal transmission of up to 1,000
ft. An additional benefit is the empty pipe detection
which features a zero flow output when the sensors are
not completely wetted. Also, the frequency output is
bi-directional while the 4 to 20mA output can be set
for uni- or bi-directional flow using the display or
the RS232 set-up tool which connects to PCs for programming
capabilities.
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about Electromagnetic Flowmeters |
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The operating principle
of magnetic flowmeters is based upon Faraday's Law of
electromagnetic induction,
" It states that a
voltage will be induced in a conductor moving through
a magnetic field."
Faraday's Law :
E=kBDV Where
E = Induced Voltage,
B = Strength of the magentic field,
D = Conductor Width,
V = Velocity of the conductor. |
The magnitude
of the induced voltage E is directly proportional to
the velocity of the conductor V, conductor width D,
and the strength of the magnetic field B. Magnetic field
coils placed on opposite sides of the pipe generate
a magnetic field. As the conductive process liquid moves
through the field with average velocity V, electrodes
sense the induced voltage. The width of the conductor
is represented by the distance between electrodes. An
insulating liner prevents the signal from shorting to
the pipe wall. The only variable in this application
of Faraday's law is the velocity of the conductive liquid
V because field strength is controlled constant and
electrode spacing is fixed. Therefore, the output voltage
E is directly proportional to liquid velocity, resulting
in the linear output of a magnetic resulting in the
linear output of a magnetic flowmeter
Magnetic Flowmeters
Magnetic flowmeters are based on Faraday's Law
of Magnetic Induction. In a magnetic flowmeter,
the liquid acts as a conductor as it flows through
the pipe. This induces a voltage which is proportional
to the average flow velocity - the faster the
flow rate, the higher the voltage. This voltage
is picked up by sensing electrodes mounted in
the meter tube and sent to the transmitter which
takes the voltage and calculates the flow rate
based on the cross sectional area of the meter
tube.
Where to use
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High percentage of solids
Sludges, slurries, minerals, paper, sewage -
flows with high levels of solids which cannot
be measured other types of meters.
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Obstructionless measurement
Nothing projects into the flow stream, no head
loss, no parts to maintain.
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Very corrosive liquids
Acids, caustics and corrosive chemical additives
are isolated from the meter by inert linings
and electrodes.
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Conductive Liquids
Liquids where conductivity is at sufficient
levels to induce measurable voltage
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Flowmeters Related products |
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References |
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