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About Flow Meters
Flow meters are used to measure the flow of air, fluids
and gas. Some of the most popular flow meters are: peak flow meters,
water flow meters, fuel flow meters, air flow meters, ultrasonic flow
meters and flow monitor services. Many flow meters measure the volume
of the material while other flow meters measure the speed, and still
other flow meters measure the mass of the materials. For the most part,
flow meters are used to infer mass flow through calculations that flow
meters and flow monitor instruments make after taking various flow measurements,
such as absolute pressure, differential pressure, viscosity and temperature.
Most flow meters are made of three parts: the primary device, transducer
and transmitter. These three flow meters parts are usually combined so
that the flow meter is one complete instrument.
Flow meter distributors offer various instruments for different measurements
of flow. Thermal mass flow meters take measurements with two sensors
that work together. A temperature sensor reference and an active heated
sensor take measurements by calculating how much heat loss occurs in
the flowing liquid, and thus these flow meters can determine the flow
rate based on this amount. Another type of flow meter is the Coriolis
mass flow meter, which operates on the basis of the Coriolis Effect.
Basically, an excitation force is applied to the flow meter tube, causing
the fluid or gas to rotate because the acceleration is acting in opposite
directions on both sides of the applied force. A flow meter measurement
can then be taken. Other kinds of flow meters operate using sound: These
are called ultrasonic flow meters, and include several types, like Doppler
Effect flow meters and time-of-flight flow meters.
Flow meter distributors offer products that are useful in a variety of
fields. Medically, flow meters are used to measure a patient’s
air intake. These types of flow meters are called peak flow meters and
are particularly beneficial for asthma patients. In plumbing, water flow
meters are used to measure the amount of fluid running through a tube
for efficiency purposes. In general, flow meters are used in many industrial
purposes for flow measurements to help companies determine profit gain
or loss. Other industries that benefit from the use of flow meters, peak
flow meters, fuel flow meters, water flow meters and flow monitor services
include automotive, petroleum and gas, utility services, HVAC, food processing
and raw materials.
Each type of flow meter has specific guidelines that must be followed
for proper use. For example, when using gas flow meters, the flow meters
must remain full of gas. Liquid in gas flow meters can affect the flow
meter’s accuracy. Similarly, in order for liquid flow meters to
work properly, they must remain full of liquid. Gas in liquid flow meters
can affect the accuracy of flow meters’ readings. Generally, contaminants
of any kind will cause an inaccurate reading of flow meters, so flow
meter distributors advise that flow meters and flow monitor instruments
must be treated with care and cleaned regularly.
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Types of Flow Meters
- are used to measure the flow of air.
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are used to measure the force of acceleration resulting from a moving
object towards or away from the center of rotation.
- are used to measure the flow of fluids and gases
in a pipe by introducing constriction that causes the pressure to drop.
The pipe must be clean to result in accurate measurements.
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measure flow at one position in a pipe, and then, based on the measurement,
they estimate the flow rate for the entire pipe.
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measure by creating a magnetic field that is channeled into the liquid
and causes a voltage signal to be sensed that is proportional to the
flow of liquid.
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are used to measure gas flow and are one of the more popular flow meters.
This meter is relatively unaffected by changes in temperature or pressure
in the tube or pipe.
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are used to measure the flow of liquids when they are open to the atmosphere.
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are used by patients with asthma or other lung disorders to measure
the amount of air patients take into their lungs. These flow meters
allow physicians to determine the severity of the illness.
- trap liquid to measure its flow by rotating parts
that move between seals and the meter body.
- have a rotating float that moves vertically through a tapered tube.
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allow the operator to view the liquid as it is moving. Some models come
equipped with lights to enhance the visibility of the fluids.
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measure the amount of force that is exerted on a target in a particular
liquid or gas. This should not be used to measure high viscosity liquids
because the target can be damaged.
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are meters that use thermal properties of fluids to measure the flow.
The meter is heated and as the liquid flows by, it can tell the flow
rate by the amount of heat lost.
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consist of a rotor that measures the fluid when it passes through the
blades. The blade speed is translated into the speed of the fluid
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use sound to determine flow rate. Both Doppler Effect meters and time-of-flight
meters are different kinds of this type.
- measure by letting the flow stream change the opening
in the meter with a movement of an internal part.
- generate oscillations as a result of the flow that allows
a measurement to be taken.
- are flow meters designed for measuring flow rates of water in various channels, tubes, partially filled pipes, streams, and rivers.
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