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7 Parameter of the gas
Manual ERZ 2000-NG · EN07 · 2019, May 13th
285
Note
ISO 6976:2016 must only be activated if the model for determining gas compo-
sition utilises a complete gas analysis.
7.4.2
DB Calculation according to AGA10/Helmholtz ISO20765-
1:2005
Figure 207: Menu DB Calculation according to AGA 10 / Helmholtz ISO20765-
1:2005
Calculation according to AGA 10 / Helmholtz ISO20765-1:2005 allows for determina-
tion of parameters which are required for the orifice measurement.
In recent years, the number of flow meters for natural gas using an ultrasonic transit
time difference method for medium and high pressures with medium and larger nom-
inal widths has multiplied many times over. Many of these devices offer determination
of the velocity of sound (VOS) by means of ultrasound.
If AGA 10 is also used for calculation of the velocity of sound based on the gas com-
position (
DB09
), 2 independent measurement values are available for control pur-
poses:
x
A change of the gas composition can be recognized
This allows for a "quick" detection of change with the slow measurement de-
terminations of a GC
Summary of Contents for ERZ2000-NG
Page 10: ......
Page 68: ...2 Introduction Manual ERZ 2000 NG EN07 2019 May 13th 58 Figure 44 Menu LA Overview...
Page 69: ...2 Introduction Manual ERZ 2000 NG EN07 2019 May 13th 59 Figure 45 Menu LB Totalizer BM1...
Page 77: ...2 Introduction Manual ERZ 2000 NG EN07 2019 May 13th 67 Figure 51 Overview System sub menu...
Page 241: ...6 Flow meters Manual ERZ 2000 NG EN07 2019 May 13th 231 Figure 167 Interface module C34...
Page 340: ...8 Overview Coordinates Manual ERZ 2000 NG EN07 2019 May 13th 330 8 5 6 TSV export...
Page 453: ...Certificates Manual ERZ 2000 NG EN07 2019 May 13th 443...