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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.
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!
Show
me more on
Propellers
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.
Show
me more on
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
Show
me more on
Magnetic
Meters
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