Vega VEGAPULS 6X - Page 43

43
5 Mounting
VEGAPULS 6X • Two-wire 4 … 20 mA/HART
66190-EN-221107
Flow formula:
Iftheowformulaofyourumeisknown,youshouldselectthisop-
tion,astheaccuracyoftheowmeasurementishighesthere.
•
Flowformula:Q=kxh
exp
Manufacturerdenition:
IfyouuseaParshallumefromthemanufacturerISCO,thisoption
mustbeselected.Thisgivesyouahighaccuracyofowmeasure-
mentwitheasyconguration.
Alternatively, you can also take over Q/h table values provided by the
manufacturer here.
•
ISCO-Parshall-Flume
•
Q/htable(assignmentofheightwithcorrespondingowinatable)
Tip:
Detailed project planning data can be found at the channel manufac-
turers and in the technical literature.
Thefollowingexamplesserveasanoverviewforowmeasurement.
h
max
≥ 2 x h
max
90°
4
3 ... 4 h
max
90°
2 3
1
Fig.44:Flowmeasurementwithrectangularume:h
max.
=max.llingofthe
rectangularume
1 Overfallorice(sideview)
2 Upstream water
3 Tailwater
4 Overfallorice(viewfromtailwater)
Rectangular overfall