Bs-3680 Thin Plate V-Notch Weir, P3 = 7 - Siemens OCM III Instruction Manual

BS-3680 THIN PLATE V-NOTCH WEIR, P3 = 7

'U' parameters required *
U0 = notch angle
*
obtain from manufacturer's specifications.
**
calculated by OCM-3. May be viewed by accessing 'U' parameter.
Reference
ABSOLUTE CALCULATION, P4 = 0
For flows that can be calculated by the equation:
q = Ce x 8/15 x tan(
where : q = flow rate
g = gravitational acceleration
α
= notch angle alpha
◊
angle is restricted to 90°, 53.133° or 28.066°. Otherwise use ratiometric calculation.
RATIOMETRIC CALCULATION, P4 = 1
For flows that can be calculated by the equation:
q = q x Ce/Ce x (h/h
cal cal
where : q = flow rate
q = flow rate at maximum head
cal
h = head
h = maximum head
cal
Ce = discharge coefficient for head
Ce = discharge coefficient for maximum head
cal
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01
alpha
¤
α
0.5 2.5
/2) x (2g) x h
◊
¤
2.5
)
cal
'U' parameters calculated **
U1 = Ce
h = head
Ce = function of h and
OCM III
α
70