48
Reference Manual
00809-0200-4840, Rev BA
December 2014
Section 4: Configuration
4.3.13
Flow measurement
lists the
Tank Shape/Non-Linear Profile
(
P011
) options that select a
standard flow structure profile and the conversion (scale) factors used to calculate a flow
process value (PV).
Tank Shape/NLP (P011) = “Special Plot”
The “
Special Plot
” option is used for
irregular-shaped
flow profiles.
See
for a full description.
Tank Shape/NLP (P011) = “Flume/Weir-3/2”
This setting is applicable when flow rate measurements are needed from an open channel with a
flume or weir profile (see
).
The rate of flow per second is calculated by:
Q = k x h
Pwr
Where ‘h’ is the live liquid level, ‘Q’ is flow rate per second, ‘Pwr’ is the power factor and ‘k’ is a
user-entered scale factor.
The transmitter automatically populates parameter
Power Factor / Profile Height
(
)
with a power factor from
Flumes that deviate from the standard “3/2 power law”, e.g. round-bottomed flumes, must use
the “
Special Plot
” profile option that is based on flow versus height tabulations (see
).
Setting-up Procedure for “
Flume/Weir-3/2
”:
1.
Use parameter
Tank Shape/NLP
(
P011
) to select “
Flume/Weir-3/2
”.
2.
Enter the scale factor into the
PV Scale Factor
parameter (
).
Tank Shape/NLP (P011) = “V-Notch-5/2”
This setting is applicable when flow measurements are needed from an open channel with a
V-notch profile.
The rate of flow through a V-notch is calculated using:
Q = k x h
Pwr
Where ‘h’ is the live liquid level, ‘Q’ is flow rate per second, ‘Pwr’ is the power factor, and ‘k’ is a
user-entered scale factor.
The transmitter automatically populates parameter
Power Factor / Profile Height
(
)
with a power factor from
Setting-up Procedure for “
V-Notch-5/2
”:
1.
Edit parameter
Tank Shape/NLP
(
P011
) to select “
V-Notch-5/2
”.
2.
Enter the scale factor into the
PV Scale Factor
parameter (
).
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