PULSAR MEASUREMENT
71
Choose Your Application
There are five categories of Primary Measuring Device, which are all described
in this chapter. They are exponential, BS3860 flumes, BS3860 weirs, special
and universal. Calculations for flow can be performed using absolute or
ratiometric calculations. The answer will be the same, the choice of calculation
method being limited to the amount of information available, with regards to
the primary measuring device. For ratiometric calculation it is normally
sufficient to know the maximum flow at maximum head for the device in
question. All types of primary measuring devices can be set up with a choice
of alarms.
If you want to set-up a basic exponential device, as described in the following
example 1, then choose 1. You then need to select the PMD for your
application from the following available options: suppressed rectangular
weir, Cipolletti (trapezoidal) weir, Venturi flume, Parshall flume, Leopold
Lagco flume, V notch weir or other, for any other type of exponential device.
To set-up an application for a BS3680 flume, as described in the following
example 2, then choose 2. You then need to select PMD the following
available options: rectangular flume with or without hump, U-throated
flume with or without hump.
To set-up an application for a BS3680 weir, as described in the following
example 3, then choose 3. You then need to select the PMD for your
application from the following available options: rectangular weir, V notch
full 90
o
(90degrees), V notch half 90
o
(53 degree 8 minutes) or a V notch
quarter 90
o
(28 degree 4 minutes).
To set-up an application for a device contained in special, choose 5. You then
need to select the PMD for your application from the following available
options: Palmer Bowlus flume, H-flume or a V notch, other than BS3680.
For devices, which do not match any of the above devices the application can
be setup using a universal flow calculation, to select this option choose 6.
You then need to select the PMD device for your application from the
following available options: linear flow or curved flow. Once you have
chosen your application you will be asked a series of questions which are
answered by choosing the appropriate option as detailed in the flow chart
below. Once all the questions have been answered you will be prompted to
provide further information, as detailed in the tables below, to complete the
programming of the unit.
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