Siemens OCM III Instruction Manual page 52

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:
x
q = k h
where q = flowrate
k = constant factor (U1)
RATIOMETRIC CALCULATION, P4 = 1
For flows that can be calculated by the equation:
x
q = q (h/h )
cal cal
where q = flowrate
h = head
x = exponent (U0)
Refer to manufacturers specifications for the exponent value.
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01
¤
x = exponent (U0)
h = head
¤
q = flowrate at maximum head
cal
h = maximum head
cal
OCM III 53