Elster Instromet 2000 - Coriolis Meter Serial Output; Coriolis Meter Calculations

Model 2000 Flow Computer Instruction Manual
2.0 GENERAL DESCRIPTION
Model 2000 issue 21 Page No
30
2.4.4.2. CORIOLIS METER SERIAL OUTPUT
If the M2000 is configured to accept a serial communication signal from the coriolis meter pulse then these will be of the form
of an RS232 or RS485 connection to one of the standard communication ports of the FC2000 see paragraph 2.9.
2.4.4.3. CORIOLIS METER CALCULATIONS
The flow computer calculates the liquid totals and flow rates (gross volume, standard volume and mass) for total liquid,
condensate and water. These calculations are based on the measured mass flow and density from the Coriolis flow
transmitter.
Volume flow rate equations
1)
LM
L
L
qM
qG
ρ
=
2)
LS
L
L
qM
qN
ρ
=
Where
qML : Mass flow rate in kg/hr Measured
qGL : Volume flow rate at line conditions in m3/hr Equation 1)
qNL : Volume flow rate at base conditions in m3/hr Equation 2)
ρLM : Line Density of Liquid at metering conditions in kg/m3 Measured
ρLS : Base Density of Liquid in kg/m3 Equation 9)
Calculation of Coefficient of Thermal Expansion CTL
3)
2
LS
1
2
LS
0
T
K
K
)(
K
+
ρ
+
ρ
=α
Temperature Volume Correction Factor Calculation at metering conditions
4)
])]tt[8.01()tt([EXPCTL
blTblTm
−
×
α
×
+
×
−
×
α−=
Pressure Volume Correction Factor Calculation at metering conditions
5)
)]pp(1[
1
CPL
elm
m
−×β−
=
Calculation of Compressibility Factor at metering conditions
6)
)C(EXP00001.0
m
×=β
7)
)
1000
(In)t0161654.002909.3()t00343804.038315.1(C
LS
ll
ρ
××+−×+=
8)
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
ρ
××
+
ρ
×
+×+−
−
×=β
2
3
10t2092.4
2
6
1087096.0
t00021592.062080.1
4
m
LS
l
LS
l
e10