BOOK_CONTENT
From Flow Measurement
Flowmeters that measure mass directly using the properties of mass, as opposed
to those that measure volume or velocity, were developed and commercialized in
the 1980s. Meters of this type have found wide application because the fluid measurement
is virtually independent of changing fluid parameters. Many of the other
flowmeter technologies are affected by changes in fluid density, viscosity, pressure,
and/or temperature. Meters that measure mass directly, in effect, weigh the
fluid as it passes through the meter, yielding a highly accurate measurement that is
virtually independent of varying process conditions that often occur. Because of
this unique ability, it is possible to use a mass flowmeter on a wide variety of process
fluids without need for recalibration or compensation to specific fluid parameters.
Mass flowmeters can
be used for the following
applications:
Clean liquids
Dirty liquids
Slurries
Gases
Steam
Liquids with entrained
gases

The Coriolis principle flowmeter is a true mass flowmeter because it uses the
properties of mass to measure mass. It is relatively easy to apply and size. Because
it possesses no moving parts, it exhibits low maintenance requirements and does
not require frequent calibration. Wetted parts that can be constructed of a variety
of materials make...


More >>
© 2001 ISA

Products & Services
Flow Controllers
Flow controllers monitor and maintain flow-rate variables, typically in process applications.
Gas Flow Meters
Gas flow meters are used for measuring the flow or quantity of a moving gas in an enclosed pipe or passage.
Liquid Flow Meters
Liquid flow meters are used to measure the volumetric flow rate or amount of a moving liquid.
Volumetric Gas Flow Switches
Volumetric gas flow switches are devices with a switch output used for measuring the flow or quantity of a moving gas in terms of a unit of volume per unit time, such as cubic feet per minute.
Volumetric Liquid Flow Switches
Volumetric liquid flow switches measure the flow or quantity of a moving fluid in terms of a unit of volume per time, such as liters per minute. These flow sensing devices have a switch output.

Topics of Interest

The majority of industrial liquid flows are carried in closed conduits that flow completely full and under pressure. However, this is not always the case for high volume flows of liquids in industrial...

Mass Flowmeters Mass flowmeters measure mass directly, using the properties of mass, as opposed to those who measure volume or velocity. This type of meter is found in applications with changing...

Mass Methods Mass flowmeters measure actual mass flow. While it is possible to calculate mass flow from a velocity or inferential measurement and other variables like temperature for known fluids,...

By Vince Salupo, Eli Lilly & Co. and Franki Parson, Emerson Process Management, Micro Motion Division This article provides discussion and suggestions on the role of Coriolis flowmeters in...

The selection of six types of flowmeters was previously discussed here (previous article, pp 176- 182, in this book). These were: variable-area, mass, Coriolis, differential-pressure, turbine, and...