FlowCERT (UL)
UL manual - Pulsar Process Measurement
UL manual - Pulsar Process Measurement
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RATIOMETRIC<br />
If the flow calculation is to be ratiometric P702 = 2 the flow will be<br />
calculated using the formula: q= q cal C e /C ecal (h e /h ecal ) 1.5<br />
Where: q = flowrate<br />
q cal = flowrate at maximum head P705<br />
Ce = discharge coefficient calculated by <strong>FlowCERT</strong> LITE P723<br />
Ce cal = discharge coefficient at maximum head<br />
he = effective head<br />
he cal = effective head at maximum head<br />
BS 3680 V-Notch Weir<br />
ABSOLUTE<br />
If the flow calculation is to be absolute P702 = 1 the flow will be calculated<br />
using the formula: q = C e 8/15tan(theta/2)(2gn) 0.5 h 2.5<br />
Where: q = flowrate<br />
Ce = discharge coefficient calculated by <strong>FlowCERT</strong> LITE P723<br />
theta = v-notch angle<br />
gn = gravitational acceleration (nominal value = 980.66 cm/s 2 )<br />
h = head<br />
<strong>FlowCERT</strong> LITE presets the angle (theta) on selection of the chosen device<br />
this angle is 90 degrees for a BS 3680 full 90 degree V notch weir, 53<br />
degrees 8 minutes in the case of the BS3680 half 90 degree V notch weir<br />
and 28 degree 4 minutes in the case of the BS3680 quarter 90 degree V<br />
notch<br />
RATIOMETRIC<br />
If the flow calculation is to be ratiometric P702 = 2 the flow will be<br />
calculated using the formula: q = q cal C e (h)/C e (h cal )(h/h cal ) 2.5<br />
Where: q = flowrate<br />
q cal = flowrate at maximum head P705<br />
Ce(h) = discharge coeffecient for head<br />
Ce(h cal ) = discharge coefficient for maximum head<br />
h = head<br />
= maximum head P704<br />
h cal<br />
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