BOOK_CONTENT
From Flow Measurement

Most flow measurements are made by meters that are installed in-line such that
all of the fluid passes through the meter body. Insertion (sampling) flow measurement
is a different technique because the meter is inserted into the pipe and the
flow rate is inferred from the measurement at a point in the flow stream.
There are both similarities and differences between in-line and insertion techniques.
On the one hand, fluid properties, pipe flow phenomena, and the basic
principles of flow sensing are the same. There are significant differences, however,
in operating principles, installation, and applications.

What Is an Insertion Flowmeter?

An insertion flowmeter consists of three basic components: a sensor, a probe
assembly, and electronic circuitry. The sensor provides a signal proportional to the
velocity or flow rate at a point in the flowstream from which total flow rate is
inferred. The circuitry properly conditions the raw signal from the sensor and performs
required computational functions. The probe assembly rigidly positions the
sensor within the flow and provides a process seal.
An insertion meter is inserted into the line. An inline meter is installed in the line.

Where Can an Insertion Meter Be Used?

An insertion meter can be used...


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© 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

Why should a separate chapter be written about custody transfer measurement since flow measurement is flow measurement? This is true, except that, when money is to be exchanged, achieving the best...

Hoffer Flow Controls continues to supply many "insertion" type turbine flowmeters to the petroleum pipeline industry. This type of meter is commonly used for leak detection and not custody transfer.

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Turbine flowmeters are designed to accurately measure the flow of liquids and gases in pipes. They are volumetric flow measuring devices and have been commercially available since the late 1940s.

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...