Modified Trapezoidal Area X Velocity, P3 = 15 - Siemens OCM III Instruction Manual

MODIFIED TRAPEZOIDAL AREA X VELOCITY, P3 = 15

'U' parameters listed *
U0 = channel top width
U1 = channel base width
U2 = transition height
*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 = 1/1000 x (b + mh) x v
q = 1/1000 x ((b + md)d + (B(h - d))) x v for h ≥ d
m = (B - b)/d
where : q = flow rate, l/s
B = channel top width, cm
b = channel base width, cm
RATIOMETRIC CALCULATION, P4 = 1
For flows that can be calculated by the equation:
q = q x A/A x v/v
cal cal
for h ≤ d: A = (b + mh) x h
A = (b + mh
cal
for h ≥ d: A = (b + md) x d + B(h - d)
A = (b + md) x d + B(h
cal
m = (B - b)/d
where : q = flow rate
q = flow rate at h
cal
B = channel top width, cm
b = channel base width, cm
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Refer to Operation \ Flow Calculation.
7ML19985AB01
B
b
ht
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for h ≤ d
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cal
) x h
cal cal
- d)
cal
cal
OCM III
'U' parameters calculated **
U3 = area (h)
d = height of transition, cm
h = head, cm
v = flow velocity, cm/sec
d = depth of channel
h = head
v = flow velocity, cm/sec
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