Siemens FUG1010 IP65 NEMA 4X, Operating Instructions Manual, Page: 97 / 271

Functions
7.1 Gas Parameters Menu
FUG1010 IP65 NEMA 4X
96
Operating Instructions, 01/2013, A5E02951519-AC
Fixed Temp and Fixed Pres. PSIA
The flow meter can accept temperature and pressure input from an external direct sensing
instrument. If you do not have external temperature or pressure available, then the flow
meter will automatically use the fixed value(s) as the assumed gas temperature and/or
pressure. Please note that for proper reporting of volume corrected flow, mass flow or
specific gravity, the flow meter must have reliable temperature and pressure input. However,
if the operating temperature and pressure is very constant, then fixed values may be used
where higher accuracy is not required.
Note
For flow meters with on-board RTD temperature capability, the [Fixed Temp] flow meter will
not be present. In this case, a fixed value for temperature can be set by spanning the analog
input 4mA setting to the desired temperature value. Providing the analog input channel is not
connected to any current source, the valued returned will be the 4mA temperature value.
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.
Z Base
The [Z Base] menu cell allows entry for the compressibility factor, at base conditions, for a
given gas composition. If using the internal AGA8 compensation, Z Base should be set
appropriately for the gas composition.
Z Actual
The [Z Actual] menu cell allows for a fixed entry of the compressibility factor in cases where
pressure, temperature and gas composition do not vary significantly. If standard volume
compensation is desired then enter the average compressibility factor for the specific gas
application.
AGA8
All FUG1010 gas flow meters include a facility for performing internal volume compensation
using an AGA8 lookup table. This volume correction method is suitable and accurate for
applications where the gas composition does not vary significantly or where the gas is
infrequently sampled (not automatically sampled).
Note
In cases where automatic sampling is performed, a gas flow computer must be used in
conjunction with the FUG1010 flow meter to provide the most accurate volume compensated
flow output.