ONICON F-2600 - Manual (Page 17)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 17
1.3 Flow Meter Configurations
Our vortex mass flow meters are available in two model configurations:
In-line F-2600 Series Flow Meters (replaces a section of the pipeline)
Insertion F-2700 Series Flow Meters (requires a tap into an existing pipeline)
Both the in-line and insertion configurations are similar in that they both use identical electronics
and have similar sensor heads. Besides installation differences, the main difference between an
in-line flow meter and an insertion flow meter is their method of measurement.
For an in-line vortex flow meter, the shedder bar is located across the entire diameter of the
flow body. Thus, the entire pipeline flow is included in the vortex formation and measurement.
The sensing head, which directly measures velocity, temperature and pressure, is located just
downstream of the shedder bar.
Insertion vortex flow meters have a shedder bar located across the diameter of a short tube. The
velocity, temperature and pressure sensor is located within this tube just downstream of a built-
in shedder bar. This entire assembly is called the insertion sensing head. It fits through any entry
port with a 1.875 inch minimum internal diameter.
The sensing head of an insertion vortex flow meter directly monitors the velocity at a point in
the cross-sectional area of a pipe, duct, or stack (referred to as “channels”). The velocity at a
point in the pipe varies as a function of the Reynolds number. The insertion vortex flow meter
computes the Reynolds number and then computes the total flow rate in the channel. The output
signal of insertion meters is the total flow rate in the channel. The accuracy of the total flow rate
computation depends on adherence to the piping installation requirements given in Section 2. If
adherence to those guidelines cannot be met, contact ONICON for specific installation advice.
1.3.1 Multivariable Options
The both versions of the meter are capable of providing the following flow measurement
options:
Volumetric flow; Mass flow with temperature compensation; Mass flow with temperature
and pressure compensation; Steam energy flow with temperature compensation;
Steam energy flow with temperature and pressure compensation, Mass or Energy flow
with temperature and external pressure compensation and Net Energy using a second
temperature sensor.