Two-Phase Fluids; Overview Of Fug1010Gcn Memory Resources; Active Memory; Site Storage Memory - Siemens SITRANS FUG1010 IP65 NEMA 4X Instruction Manual

Section 6
Therefore, it measures and reports the aeration level as the analog output, Vtrb %. This represents the
relative degree of turbulence detected within the flow stream. The flowmeter reports the Vtrb level until
it impedes operation and forces a Fault Alarm. The Vtrb output accommodates applications requiring an
aeration indicator. You can use the turbulence percentage as an alarm relay set-point. Vtrb appears also
on the graphic display screen. The system will issue a fault alarm before aeration reaches a level that
impairs flow measurement.

6.3.6 TWO-PHASE FLUIDS

Two-phase fluids (e.g., gas and water) cause sonic beam scattering. Two-phase fluids with large quan-
tities of different components, such as oil or water, could prove to be too attenuative for transit-time
operation.
6.4

OVERVIEW OF FUG1010GCN MEMORY RESOURCES

The FUG1010GCN memory resources include both Read-Only-Memory (ROM) and battery-backed Ran-
dom Access Memory (RAM). The ROM memory contains the system operating instructions, the on-line
help text, the default data, and the pipe, transducer and fluid tables. The flowmeter uses 1 Megabyte of
RAM (standard) to provide three discrete storage functions:

• Active Memory

• Site Storage Memory

• Datalogger Memory

Upon creating a site, the meter copies all ROM-based defaults into the meter's operational database, the
Active Memory. This provides two advantages. First, RAM-based operation increases performance. In
addition, this action creates an immediate Site Setup, based on the meter's defaults. Therefore, to make
the meter operational, you only have to enter required data (e.g., pipe and transducer data) and option-
ally edit other default settings to suit your application. When you program the meter, all your entries are
retained in the Active Memory. This allows you to use the meter immediately after finishing a Site Setup.
However, you are not limited to one set of site parameters. The FUG1010GCN allows you to copy site
data from Active Memory to Site Storage Memory.
Site Storage Memory provides a permanent storage area for several inactive Site Setups. The multi-site
storage feature allows rapid reinstallation at many different locations. All you have to do to reactivate an
inactive Site Setup is to recall it back into to Active Memory. However, be aware that this action over-
writes ALL the data residing in the Active Memory area.
The Datalogger logs data collected at preset intervals during operation. It uses the system RAM re-
sources independently of Active Memory and Site Storage Memory. Therefore, data movement between
Active Memory and Site Storage memory will not affect it directly. However, all stored data shares a
common RAM pool. The meter allocates the actual amount of bytes available for each storage function
dynamically, depending on the demands of each facility. Therefore, an unusually large Datalogger file
may reduce the amount of site storage memory available. On the other hand, storing several inactive
site setups may reduce the available logging capacity. If you receive a [Memory Full!] message when
you try to save a Site Setup, then you will have to delete an obsolete Site Setup or clear the Datalogger
Memory to make room. Another Datalogger memory consideration applies to dual-channel systems,
when both measurement channels are actively logging data. Dual-channel meters store logged data
from BOTH channels in a common file so you must include Site Id for each line to identify the applicable
measurement channel.
6-4
1010GCNFM-3C