Siemens FUG1010 IP65 NEMA 4X, Operating Instructions Manual, Page: 94 / 271

Functions
7
7.1 Gas Parameters Menu
This menu becomes available after picking a flow meter type and measurement path. We
recommend that you edit the Gas Parameters immediately after creating a new Site Setup,
however any item in the [Gas Parameters] menu can be altered at any time, even during
normal flow meter operation. The default settings are probably suitable for most applications,
however if reliable data can be provided regarding the gas specific heat ratio, gas viscosity
or gas compressibility factor, these settings should be modified.
The FUG1010 Gas flow meter uses the Gas Parameters data to establish the specific gravity
and the volume correction factors required for mass flow or standard volume computations.
●
The base temperature and base pressure settings are customer provided and are used
for standard volume correction.
● The specific heat ratio item is required for the computation of the average gas specific
gravity.
● The Viscosity (cP) item is required for proper flow profile compensation.
● The fixed MW (molecular weight) allows you to force the flow meter to use a specific
molecular weight for well-defined gases.
● The fixed Pressure entry allows for a fixed value to be entered when no external pressure
(analog input) is available.
● The flow meter is also capable of providing an AGA8 volume compensation for fixed gas
compositions. This is accomplished by creating an offline lookup table that contains the
compressibility and density values for a defined range of pressure and temperature. Once
completed, the table must be downloaded to the flow meter. Refer to AGA8 table
generation instructions in this section.
The list below shows the defaults and description for all the [Gas Parameters] menu items.
Each item in the [Gas Parameters] menu can be edited by the user. Pressing the <Right
Arrow> key on any of these menu items will enable numeric entry and allowing the user to
override the default values.
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FUG1010 IP65 NEMA 4X
Operating Instructions, 01/2013, A5E02951519-AC
93