Emerson Daniel 3410 Series Operation Manual page 35

Operations manual
DAN-20057316
P
abs,b
shown in
T
b
T
f
Z
b
Z
f
4.5.6 Volume
The Daniel 3410 Series Gas Ultrasonic Flow Meter provides forward and reverse volume
accumulators for each of the three volumetric flow rate values: raw, flow-condition (raw
with expansion and/or profile correction), and base-condition.
Each volume accumulator is actually stored as a data pair: (64-bit unsigned integer
portion, 32-bit floating point fractional portion). For example, a volume of 12345.750 m
is stored as 12345 m
that while a volumetric flow rate can be positive (indicating forward flow) or negative
(indicating reverse flow), the volume accumulators are always positive values.
The non-volatile volume accumulator data points are as listed in the table below:
Table 4-3: Volume accumulation data points
Volumetric
flow rate type
Raw
Flow-condition
Base-condition
4.5.7 Energy rate and totals
These calculations require that the flow-condition pressure and temperature are available
(either fixed or optional analog inputs,
property data (composition and heating value) are available (either fixed or optionally read
from a GC,
performed (internally by the meter or externally with the results written to the meter,
Flow-condition pressure and
The energy rate is calculated as shown in
Equation 4-13: Energy rate
where
Q
Q
HV = "in-use" heating value (kJ/dm
Model 3418 GUSM
= flow-condition absolute pressure (MPaa) (AbsFlowPressure) calculated as
Equation 4-9.
= base-condition temperature (K) (TBase)
= flow-condition temperature (K) (FlowTemperature)
= base-condition compressibility factor (ZBase)
= flow-condition compressibility factor (ZFlow)
3
for the integer portion and 0.750 m
Forward Direction
Integer
PosVolUncorr
PosVolFlow
PosVolBase
Flow-condition pressure and
Q
E
= energy rate (MJ/h) (EnergyRate)
E
= base-condition volumetric flow rate (m
Base
Fraction
PosVolUncorrFrac
PosVolFlowFrac
PosVolBaseFrac
Flow-condition pressure and
temperature), and the AGA8 calculations are
temperature).
Energy rate
= Q × HV ×
1MJ
Base
1000kJ
3
/h) (QBase)
3
) (HeatingValueInUse)
Measurement
3
as the fractional portion. Note
Reverse direction
Integer Fraction
NegVolUncorr NegVolUncorrFrac
NegVolFlow NegVolFlowUncorr
NegVolBase NegVolBaseUncorr
temperature, the gas
1000dm 3
×
1m 3
January 2019
3
35