Onicon F-2600 Bedienungsanleitung PDF herunterladen (Seite 17)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 17

1.3 Flow Meter Congurations

Our vortex mass ow meters are available in two model congurations:

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 congurations are similar in that they both use identical electronics

and have similar sensor heads. Besides installation differences, the main difference between an

in-line ow meter and an insertion ow meter is their method of measurement.

For an in-line vortex ow meter, the shedder bar is located across the entire diameter of the

ow body. Thus, the entire pipeline ow 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 ow 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 ts through any entry

port with a 1.875 inch minimum internal diameter.

The sensing head of an insertion vortex ow 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 ow meter

computes the Reynolds number and then computes the total ow rate in the channel. The output

signal of insertion meters is the total ow rate in the channel. The accuracy of the total ow 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 specic installation advice.

1.3.1 Multivariable Options

The both versions of the meter are capable of providing the following ow measurement

options:

Volumetric ow; Mass ow with temperature compensation; Mass ow with temperature

and pressure compensation; Steam energy ow with temperature compensation;

Steam energy ow with temperature and pressure compensation, Mass or Energy ow

with temperature and external pressure compensation and Net Energy using a second

temperature sensor.

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