Siemens FUG1010 IP65 NEMA 4X, Operating Instructions Manual, Page: 95 / 271

Functions
7.1 Gas Parameters Menu
FUG1010 IP65 NEMA 4X
94
Operating Instructions, 01/2013, A5E02951519-AC
Table 7- 1 Gas Flow Meters Menu Structure and Default Values
Base Temp 15.5°C (60°F) Enter reference temperature in C or F.
Base Pres. PSIA 14.7 psia (1.014 bara) Enter reference pressure in PSIA or BARA.
Gas Flow meters
Spec. Heat Ratio 1.3 Enter gas specific heat ratio (constant pressure
to constant volume.)
Viscosity (cP) 0.010 centipoise Enter absolute gas viscosity in centipoise.
Fixed MW g/mole 0.0 grams/mole Enter fixed molecular weight to override
automatic computation.
Estimated Vs m/s 450 m/sec Enter the nominal sound velocity of the gas if
significantly different from this default.
Fixed Pres. PSIA 14.7 psia (1.014 bara) Enter fixed operating pressure if external input
is not available.
Z Base 1.000 Enter the compressibility factor for the gas at
base conditions.
Z Actual 1.000 Enter fixed compressibility factor where
pressure, temperature and gas composition do
not vary significantly.
AGA8 Comp YES/NO If a valid AGA8 table is installed then select
[YES] to activate the AGA8 compensation (Std.
Vol. Comp from the Flow/Total Units menu must
also be selected).
Base Temp and Base Pres. PSIA
The base temperature and base pressure represents the conditions to which the reported
volumetric flow rate and volumetric total will be compensated to (standard or normal
conditions) as described in the equation below. The required units for data entry are
determined by the [Preferred Units] menu cell (English or Metric) selected in the [Meter
Facilities] menu. If metric units are selected then the units for temperature and pressure will
be degrees Celsius and BARA (absolute) respectively. For English units, temperature and
pressure will be in degrees Fahrenheit and PSIA.
4
EDVH
4
DFW
[
3
EDVH
3
DFW
[
7
DFW
7
EDVH
[
=
DFW
=
EDVH
where:
Q = Volumetric flow rate
P = Pressure (absolute)
T = Temperature (absolute)
Z = Compressibility
base = Base conditions (pressure and temperature)
act = Actual flowing condition (pressure and temperature)