Siemens OCM III, Инструкция по эксплуатации, Страница: 85 / 112

MODIFIED TRAPEZOIDAL AREA X VELOCITY, P3 = 15
‘U’ parameters listed * ‘U’ parameters calculated **
U0 = channel top width B U3 = area (h)
U1 = channel base width b
U2 = transition height ht
*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 for h
≤
d
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 d = height of transition, cm
B = channel top width, cm h = head, cm
b = channel base width, cm v = flow velocity, cm/sec
RATIOMETRIC CALCULATION, P4 = 1
¤
For flows that can be calculated by the equation:
q = q
cal
x A/A
cal
x v/v
cal
for h
≤
d: A = (b + mh) x h
A
cal
= (b + mh
cal
) x h
cal
for h
≥
d: A = (b + md) x d + B(h - d)
A
cal
= (b + md) x d + B(h
cal
- d)
m = (B - b)/d
where : q = flow rate d = depth of channel
q
cal
= flow rate at h
cal
h = head
B = channel top width, cm v = flow velocity, cm/sec
b = channel base width, cm
¤
Refer to Operation \ Flow Calculation.
7ML19985AB01 OCM III 86