Different Types of Flow Meters

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Different Types of Flow Meter
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Different Types of Flow Meter
Flow meter is an instrument that is used to gauge
the flow of gases or fluid through a pipe. Flow
measurement applications differ extensively with
respect to the conditional benchmarks,
situational limitations, and engineering
requirements. Flow meter has other names such
as fluid meter, fluid sensor, flow sensor and
flow gauge. They have a wide range of
applications across different industries based on
its basic function, which is to offer precise
monitoring and measurement for flow of fluids or
gases.
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Differential Pressure Flow Meters
Differential pressure flow meters measure the
differential pressure across an orifice where
flow is directly related to the square root of
the differential pressure produced. There are
also primary and secondary elements in
differential flow meters. The primary element
produces change in kinetic energy using either
flow nozzle, pitot tube, orifice plate, or
venturi flow meters. The secondary element
measures the differential pressure and provides
the signal.
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Orifice Plates An orifice plate is a plate with
a circular hole in the middle of it. When fluid
flows through the hole, the velocity will
increase and the pressure will decrease. Orifice
plates are commonly used when the flow is
continuous and occupies the entire pipe.
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Flow Nozzles A Flow Nozzle is very similar to an
orifice plate, the main difference is that flow
nozzles have a gradual constriction rather than
the abrupt constriction of an orifice plate. Flow
nozzles are common for high velocity, low
viscosity flows. Flow nozzles also have a greater
flow capacity when compared to other differential
pressure meters.
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Positive Displacement Flow Meters
Positive displacement (PD) flow meters measure
the volume filled with fluid, deliver it ahead
and fill it again, which calculates the amount of
fluid transferred. It measures actual flow of any
fluid while all other types of flow meters
measure some other parameter and convert the
values into flowrate. In PD flow meters, output
is directly related to the volume passing through
the flow meter. PD flow meters include piston
meters, oval-gear meters, nutating disk meters,
rotary vane type meters, etc.
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Piston Flow Meters Piston flow meters or rotary
piston displacement meters are most commonly used
for domestic water measurement. They operate by
having a piston rotate in a chamber with a known
volume. Every rotation the piston makes passes a
volume of water equivalent to the chambers known
volume down the pipe.
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Gear Flow Meters Gear flow meters consist of two
round gears that are mounted in overlapping
compartments. When a fluid flows through the
inlet it gets trapped in the teeth of the gear
and is transported to the outlet. Knowing the
volume of the voids between the teeth and the
wall and the number of rotation, the flow rate
can be calculated.
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Open Channel Flow Meters
Measurement of liquid in open channels include
v-notch, weirs and flumes. These dam-like
structures, or overflows, allow for a limited or
concentrated free-flow of liquids based on the
unique shape and size of the structure. This type
of flow meter allows for a reading of the
flowrate to be calculated.
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Flumes Flumes are specifically shaped structures
that are placed in the flowing fluid. Under free
flow the flume forces the flow to accelerate in a
way that can be characterized by known
relationships between the head of the fluid, and
the fluids flow rate. Flumes generally consist of
three sections the inlet, the throat, and the
diverging exit.
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Weir Weirs are generally structures that are
placed as an obstruction in the fluid flow such
as a dam with a special shaped opening at the
top. When the weir is placed perpendicular to the
flow its causes the fluid level to rise, this
rise is usually recorded by a device upstream of
the weir.
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Electromagnetic Flow Meters
Magnetic flow meters or, mag meters, use the
principal of Faradays law of electromagnetic
induction to calculate the fluid flow rate.
Faradays law states that a voltage will be
induced when a conductor moves through a magnetic
field. For this case, the liquid fluid serves as
the conductor and the magnetic field is applied
to the metering pipe.
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• Proteus Industries Inc.
• 340 Pioneer Way Mountain View California USA
  94041,
• [phone]
• [phone]
• sales_at_proteusind.com

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943-4111 Mark Malfatti [phone] Alex
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