Reference Manual
00809-0100-4840, Rev. BA
July 2008
Rosemount 3100 Series
F-10
P011 = “Flume/Weir-3/2”
This setting is applicable when flow measurements involving an open channel
with a flume or weir profile is required.
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
(P014) and k is a user-entered factor (P013).
Flumes that deviate from the standard “3/2 power law”, such as
round-bottomed flumes, must use the “Special” shape option (P011) that is
based on flow versus height tabulations (see “P011 = “Special”” on page F-6).
Setting-up Procedure for “Flume/Weir-3/2”:
1. Select “Flume/Weir-3/2” option using P011.
2. Enter the K-factor in P013.
Figure F-5. Rectangular Weir
Example (Using 3/2 Power Law)
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