www.mccrometer.com Open in urlscan Pro
45.60.155.100  Public Scan

Submitted URL: https://go.mccrometer.com/MzU4LU9URS00MjEAAAGCy7IR_zvzzJZqhs1VoM7QWdbVHypkjrtZb08FZ9UMb_YnYkjMdEIPz5_Fb4qzWmkEshuZF_0=
Effective URL: https://www.mccrometer.com/technical-articles/electromagnetic-and-ultrasonic-meters-comparison&utm_source=marketo&utm_mediu...
Submission: On February 24 via api from US — Scanned from DE

Form analysis 4 forms found in the DOM

POST https://www.mccrometer.com/authentication-login.jsa

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      value="/home"></div>
  <div class="formActions"><input type="submit" value="Login"> <a href="/password-request.reset.prep.jsa" style="float: left; margin: 0pt;">Forgot your login info?</a></div>
</form>

GET /quick.search-quick.search.jsa

<form id="quickSearchForm" action="/quick.search-quick.search.jsa" method="get" __bizdiag="523149226" __biza="WJ__">
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          <option value="Croatia">Croatia</option>
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ELECTROMAGNETIC METERS AND ULTRASONIC METERS — A COMPARISON

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Water and wastewater professionals rely on accurate flow measurements for
process operation and regulatory compliance. Selecting the best flow meter for
each application is essential to obtaining accurate flow data.

A starting point is detailed knowledge of the application and the fluid being
measured. It’s also necessary to understand the characteristics of different
meter types to determine a best fit. Electromagnetic meters and ultrasonic
meters are popular for use in the water industry. Below is a comparison of these
two meter types to assist with decision-making.

Operating Principles

Electromagnetic flow meters, called “mag” meters, operate on the principle of
Faraday’s Law. This principle basically states that as a conductor, such as
water, moves through a magnetic field it produces an electrical signal.
Full-bore magmeters use an electromagnet mounted on the outside of the pipe,
perpendicular to the flow direction. As flow passes through the magnetic field,
electrically charged ions accumulate, with negative ions on one side and
positive on the other. The resulting change in voltage is directly proportional
to the velocity of the fluid passing through the pipe, which can be converted to
volume.

Insertion magmeters operate a little differently. For an insertion meter, a very
small, localized magnetic field is inserted into the pipe. Electrodes cause
charge bearers to separate. With a full-profile insertion meter, electrodes are
located along the entire cross-section of flow to measure average velocity
across the pipe centerline.

Ultrasonic flow meters use sound waves to measure the velocity of fluid flowing
through a pipe and convert that data to volume. Two basic types of ultrasonic
meters are transit-time and Doppler meters.

Transit-time meters send ultrasound signals into the flow using transducers that
are either clamped onto or inserted into the pipe at two locations. The
difference between the time it takes for sound to travel upstream and downstream
between the two sensors is directly proportional to flow velocity.

Doppler meters use sound waves reflected off materials in the fluid, such as air
bubbles or particulates, to measure flow velocity.

Applications And Limitations

Both magmeters and ultrasonic flow meters can be used for various water and
wastewater applications, including measurement of sludges, slurries, and some
chemicals.

Magmeter performance is not affected by temperature, pressure, or viscosity.
These meters can handle rapid changes in flow. They can accurately measure clean
fluids like drinking water or those with heavy solids like sewage lift stations
and biosolids facilities.  However, magmeters cannot measure non-conductive
fluids like oils, steam, or gases. Magmeters can measure flow going vertically
or horizontally. With today’s high-resolution microprocessors, they can measure
flows as low as 0.2 to 0.3 feet per second.

Transit-time ultrasonic meters can measure conductive and non-conductive fluids.
These meters may have problems measuring fluids with suspended solids, debris,
or air bubbles, which interrupt the path of the sound signal. Temperature
compensation may be required to maintain accuracy. Corrosion, pitting, or
biofilm buildup on the pipe wall can cause problems as well.

Doppler meters need some type of material — air bubbles or solids — in the
stream to measure flow.

Installation Factors

Ultrasonic and magmeters can both be installed on a wide variety of pipe
materials and sizes, from ½-inch to over 100 inches in diameter.

For tight sites or retrofit projects, magmeters require less straight pipe to
avoid inaccuracies from flow disturbers. A full-bore magmeter only needs one
diameter length upstream and two downstream, whereas the ultrasonic
meters typically need 10 upstream and five downstream.

Insertion-type magmeters offer the ability to install the meter with a hot-tap
for cases where shutting down the process is undesirable.

An important consideration for magmeter installation is to ensure an
electrically quiet atmosphere, with good grounding and shielded cables.

Transit-time ultrasonic meters can be clamped on or hot-tapped into the pipe.
Coatings must be removed from the outside of the pipe and a material added
between the pipe and sensor. The exact thickness and material of the pipe must
be known in order to obtain desired accuracy.

Maintenance

Magmeters have no moving parts and require no maintenance.

Ultrasonic meters are also devoid of moving parts. The clamp-on types require a
material between the sensor and the pipe to properly transmit the sound. This
material degrades over time and needs replacement. Also, the clamps must
occasionally be tightened.

Both types of meters have problems with lightning strikes and power surges.

Accuracy

Magmeters are highly accurate, with inaccuracies of ±0.5 percent of rate or
less. In comparison, transit-time ultrasonic meters have inaccuracies of ±1 to 2
percent of rate.

Cost

Cost comparisons depend greatly on the specific project rather than meter cost.
Both meters can provide cost-effective flow measurement. Would the project use a
full-bore magmeter or insertion type? A transit-time ultrasonic or Doppler? The
additional straight pipe needed for ultrasonic meters could add extensive
capital costs.

The higher accuracy level of the magmeters combined with minimal straight pipe
requirements and long life provide a very low lifecycle cost. A New York City
magmeter installation from 1920 is still working and providing accurate flow
data.

Choosing The Best Meter For Your Application

Both magmeters and ultrasonic meters provide highly accurate flow readings for
water and wastewater applications.

However, the magmeters provide a higher level of accuracy and more flexibility.
Magmeters are available for full-bore installations but can also be provided for
instances where hot-taps are needed to avoid process shutdown. A full-profile
insertion magmeter provides the high accuracy level of a full-bore installation
without the need to cut into an existing pipe.

For retrofit projects or those where space is limited, the need for only one
diameter length of straight pipe upstream and two downstream lowers capital
costs and makes life easier.

With no maintenance requirements and extremely long operating life, magmeters
have low lifecycle costs for dependable, accurate flow measurement.

Ask For Technical Assistance

Water professionals shoulder the responsibility for protecting the public health
and the environment. Accurate flow measurement is an important part of process
operation. Choosing the right flow meter saves time, money, and headaches.

Manufacturers’ representatives have deep knowledge and experience that can help
in making the right decision. Ask for their assistance when deciding which meter
works best for your project.





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