Siemens 7ML19985AB01 instruction manual U0 = notch angle Alpha U1 = Ce

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

‘U’ parameters required *		‘U’ parameters calculated **
U0 = notch angle	alpha	U1 = Ce

*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(α/2) x (2g)0.5 x h2.5
where : q = flow rate	h = head
g = gravitational acceleration	Ce = function of h and α

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 = qcal x Ce/Cecal x (h/hcal)2.5

where : q = flow rate

qcal = flow rate at maximum head h = head

hcal = maximum head

Ce = discharge coefficient for head

Cecal = discharge coefficient for maximum head

¤Refer to Operation \ Flow Calculation.

7ML19985AB01 OCM III 70