PULSAR MEASUREMENT
89
Example 2 BS3680 U-Throated Flume
In this example, it is required to calculate to BS3680 the flow through a U-
Throated Flume without any hump. Absolute calculation will be used, and
there is a requirement for an alarm to indicate a low flow condition which
will be set to relay 1. The flow rate is to be displayed in cubic meters/hour
and the totaliser is also to record the flow in cubic metres, the resettable
totaliser is to be displayed during RUN.
The application is to be assigned to point 2 (Transducer 2).
The distance from the end of the transducer horn (dB Mach3) or face of the
transducer to
zero
flow (
P2-105
) is 1 metre and
max head
(
P2-704
) is 15
inches,
maximum flow
(
P2-705
) will be calculated by the UltraTWIN as
0.1784 Mil USG/Hour.
The dimensions of the flume are as follows:
Approach
Channel
diameter
(
Dim “A”
)
P2-710
= 28 inches
Throat diameter
(
Dim “B”
)
P2-711
= 20 inches
Throat length
(
Dim “C”
)
P2-712
=
40 inches
