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How
do the different type of meters work? Which types best suit your
applications?
Click on the icons above to find out.
Propeller
Flowmeters
 Where
to Use
Clean
water flows:
Props can measure liquids with up to 5% suspended solids at temperatures
up to 100°F.
Uncertain
or unavailable power: Does
not require power to operate.
Wide size
range:
Available in sizes up to 72".
Accuracy:
Fairly good at ±2% standard.
How
they Work
Propeller Meters have
a blade which rotates as the flow passes. These rotations are interpreted
as flow by a totalizer usually mounted on the meter. Propeller meters do
not require a power source to totalize flow. When equipped, the propeller
meter can send an output signal (requiring an external power supply) to a
remote location.The
propeller meter is a low cost, low maintenance meter.
Sparling
Propeller Meters
Sparling Propeller Meters
are engineered for a long, trouble-free life. Many have been in service
for 25, 30 even 40 years with only minor service! Click here to learn more
about our newest
addition to the Sparling
Propeller Meter Family!
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me more on
Propellers
Ultrasonic
Time-of-Flight
 Where
to Use
Relatively
clean liquids in closed pipes
Ideal for relatively clean liquids in closed pipes such as raw water,
influent, filter effluent, backwash water, raw sewage, treated effluent,
plant water, acids, bases, light hydrocarbons, acid mine drainage.
Do not use in application with higher
percentages of suspended solids or entrained gasses as these can cause
loss of echo (meter failure).
Low or no conductivity
Since the time-of-flight meter uses ultrasonics, there is no liquid
conductivity requirement as with a magnetic flow meter. Like magmeters,
they are unaffected by changes in
temperature, density, conductivity or viscosity and provide
obstructionless flow.
Accuracy
Good accuracy is ±1% of actual flow or better.
How
they Work
Ultrasonic
pulses are beamed from transducers mounted on opposite sides of the pipe.
These pulses are fired alternately upstream and downstream. Pulses fired
downstream travel faster as they are carried by the flow. Pulses fired
upstream travel slower as it fights the flow. The difference in time for a
pulse to travel upstream and downstream is measured. The greater the
difference in time between upstream and downstream pulses, the faster the
flow. The flow rate is calculated
based on the cross sectional area of the meter tube.
Sparling
Ultrasonic TOF Meters
Sparling Ultrasonic Time of Flight Meters come in two configurations: As
an integral unit complete with tube assembly and as an on-site field
installation kit. Click here to find out more about Sparling TOF meters.
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Time
of Flight Meters
Magnetic
Flowmeters
 Where
to use
High percentage of solids
Sludges, slurries,
minerals, paper, sewage - flows with high levels of solids which cannot be
measured other types of meters.
Obstructionless
measurement
Nothing projects
into the flow stream, no head loss, no parts to maintain.
Very
corrosive liquids
Acids, caustics and
corrosive chemical additives are isolated from the meter by inert linings
and electrodes.
Conductive
Liquids
Liquids where conductivity is at sufficient levels to induce measurable
voltage.
How
they Work
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.
About
Sparling Magmeters
Sludge, slurry, soup or salsa -
there is a Sparling magmeter to fit your application. Sparling Magmeters
come with a two-year warranty and offer a wide selection of meter sizes,
liners and electrode materials to suit your application. Click
here to learn more about
Sparling Mags including the newest
addition
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me more on
Magnetic
Meters
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