6 Flow meters
Manual ERZ 2000-NG · EN07 · 2019, May 13th
212
Profile and symmetry factory
With a fully developed flow, the middle paths (3 + 4) have the highest prevailing
speed, the two outside paths (1 + 2; 5 + 6) have about the same speed. The profile
factor (
PF
) is typically between 1.05 and 1.20; with values below 1.00 or above 1.50,
the flow conditions must be checked.
ܲܨ ൌ
ʹ ڄ ሺݒlj
ଷ
ݒlj
ସ
ሻ
ሺݒlj
ଵ
ݒlj
ଶ
ሻ ሺݒlj
ହ
ݒlj
ሻ
The symmetry factor (
SY
) is normally 0.90
–
1.10; with values below 0.75 or above
1.25, the measuring conditions must be checked.
ܻܵ ൌ
ሺݒlj
ଵ
ݒlj
ଶ
ሻ
ሺݒlj
ହ
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Meter performance
This value (
MP
) indicates whether the speeds of all measuring paths could be deter-
mined and incorporated into the flow rate calculation. Calculation takes place for the
last 20 measurements (identical to the number for turbulence).
ܯܲ ൌ
σ
σ
ͳ
ሺר ݒ
ǡ
ൌ ݇ሻ ש Ͳ ሺר ݒ
ǡ
് ݇ሻ
ୀଵ
ଵ
ୀଵ
ͲͲ
The value is a maximum of 100%; under normal conditions it is above 95%. Since 2
measuring paths can fail before a 6-path USM loses its calibrated accuracy, the value
may temporarily decrease to 66%; if the failure is due to a defective transducer, an
immediate repair of the affected transducer of the failed measuring path must be
sought.
Содержание ERZ2000-NG
Страница 10: ......
Страница 43: ...2 Introduction Manual ERZ 2000 NG EN07 2019 May 13th 33 Figure 17 Display of the ERZ2000 NG in the browser...
Страница 68: ...2 Introduction Manual ERZ 2000 NG EN07 2019 May 13th 58 Figure 44 Menu LA Overview...
Страница 69: ...2 Introduction Manual ERZ 2000 NG EN07 2019 May 13th 59 Figure 45 Menu LB Totalizer BM1...
Страница 77: ...2 Introduction Manual ERZ 2000 NG EN07 2019 May 13th 67 Figure 51 Overview System sub menu...
Страница 109: ...3 Electrical connections Manual ERZ 2000 NG EN07 2019 May 13th 99 Figure 81 Menu EH Module assembly...
Страница 111: ...3 Electrical connections Manual ERZ 2000 NG EN07 2019 May 13th 101 Figure 83 Menu EI Configuration...
Страница 241: ...6 Flow meters Manual ERZ 2000 NG EN07 2019 May 13th 231 Figure 167 Interface module C34...
Страница 261: ...6 Flow meters Manual ERZ 2000 NG EN07 2019 May 13th 251 6 5 2 AP diff pressure Figure 184 Menu AP differential pressure...
Страница 340: ...8 Overview Coordinates Manual ERZ 2000 NG EN07 2019 May 13th 330 8 5 6 TSV export...
Страница 345: ...9 Faults Manual ERZ 2000 NG EN07 2019 May 13th 335 9 1 2 JB Message register Figure 249 Menu JB Message register...
Страница 347: ...9 Faults Manual ERZ 2000 NG EN07 2019 May 13th 337 9 1 4 JD Debugging Figure 251 Menu JD Debugging...
Страница 448: ...Appendix Manual ERZ 2000 NG EN07 2019 May 13th 438 K 18 T Trend TA Trend block See chapter 2 5 8 Trend...
Страница 453: ...Certificates Manual ERZ 2000 NG EN07 2019 May 13th 443...