Siemens OCM III - Primary Element Flow Calculation Setup; Simple Exponential Devices (P3=0)

SIMPLE EXPONENTIAL DEVICES, P3 = 0
‘U’ parameters required *
U0 = exponent
U1 = k factor (P4 = 0 only)
Typical Exponential Devices:
» Sutro (proportional) weir
» head measurement only
» Rectangular (suppressed) or Trapezoidal (Cipolletti) weir
» Kahfagi venturi
» Parshall flume
» Leopold Lagco
» Triangular (V-notch) weir
*
obtain from manufacturer’s specifications.
Reference
ABSOLUTE CALCULATION, P4 = 0
¤
For flows that can be calculated by the equation:
q = k h
x
where q = flowrate x = exponent (U0)
k = constant factor (U1) h = head
RATIOMETRIC CALCULATION, P4 = 1
¤
For flows that can be calculated by the equation:
q = q
cal
(h/h
cal
)
x
where q = flowrate q
cal
= flowrate at maximum head
h = head h
cal
= maximum head
x = exponent (U0)
Refer to manufacturers specifications for the exponent value.
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01 OCM III 53