Siemens 7ML19985AB01 instruction manual For h ≥ d, = B b/d Where q = flow rate, l/s

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 = qcal x A/Acal x v/vcal
for h ≤ d: A = (b + mh) x h
Acal = (b + mhcal) x hcal
for h ≥ d: A = (b + md) x d + B(h - d)
Acal = (b + md) x d + B(hcal - d)
m = (B - b)/d
where : q = flow rate	d = depth of channel
qcal = flow rate at hcal	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