Siemens OCM III, Instruction Manual, Page: 95 / 112

UNIVERSAL AREA X VELOCITY, P3 = 20
Arbitrary area is typically used when the primary element and/or its flow do not fit any
of the primary elements covered by P3. There is no user difference between absolute
and ratiometric calculations P4.
The flow curve is characterized by entering the head (A
even
) and area (A
odd
)
ordinates for the number of data points (n, 4 to 16) over the flow range. The first
point (A0,A1) generally being at 0 head and the last point (A
2n-2
,A
2n-1
) generally being
at maximum head .
‘U’ parameters required * ‘U’ parameters calculated **
U0 = number of data points
(n, 4 to 16)
U1 = area (h)
A
even
= head
A
odd
= area
*
obtain from manufacturer’s specifications.
**
calculated by OCM-3. May be viewed by accessing ‘U’ parameter.
e.g. typical open channel
transducer *
* The transducer must be above the maximum head by at least the
blanking value, P47.
7ML19985AB01 OCM III 96