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Thus, one obtains for the average flow velocity:
v
v
= ∑ w
∙v
w
i
ki
i=1
Flow velocity
Legend
=
v
w
=
w
i
The summation and the weighting specified result from the mathematic Gaussian
integration procedure.
Quality of installation
The USM-GT-400 provides parameters that allow a rating of the installation. If the
values are within given ranges, then good measurement conditions can be as-
sumed. If the values are outside the accuracy of the reading may be affected by
disturbed flow conditions. Please contact in this case the RMG service.
"Manufacturer" on page I
Turbulence
Due to the actual flow, in particular the turbulence, there will be
characteristic variations (variance
(i = 1..6; number of ultrasonic measuring paths), which
allow an assessment of the installation. The ultrasonic path averaged
turbulence (Tu
) is calculated as follows:
i
��
1
= √
��
∑(��
��
��,��
�� − 1
��=1
Variance
Turbulence
4 Functional principle – Ultrasonic-flow measurement
Average flow velocity
Weighting factor with regard to the flow profile
σ
) of the individual path velocities
i
2
− ��̅
)
˄ �� = 1. .6; �� = 20
��
��
����
=
��
��̅
��
��
Manual USM GT400 · EN10 · May 2021
35
(m/s)
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