Viscous Liquids; Temperature And Pressure Ratings; Overview Of The Fue1010En Memory Resources - Siemens SITRANS F Instruction Manual

Section 5
1010ENFM-3B
5.4.8 TWO-PHASE LIQUIDS
Two-phase liquids (e.g., oil and water) cause some sonic beam scattering. However, these usually con-
duct sonic beams sufficiently for proper operation (unless heavy aeration is present also). Two-phase
liquids with large quantities of different components, such as sand or free gas, could prove to be too
attenuative for transit-time operation. However, switching to Reflexor mode will keep the meter opera-
tional under these circumstances.

5.4.9 VISCOUS LIQUIDS

Highly viscous liquids tend to "absorb" some of the energy of the sonic beam. This causes a reduction of
signal amplitude when compared to low viscosity liquids. However, most high viscosity liquids are suffi-
ciently conductive for acceptable operation. A low Valc % value usually indicates low sonic conductivity.

5.4.10 TEMPERATURE AND PRESSURE RATINGS

We rate our standard (universal) transducers for operation up to 250°F. We offer High (H) temperature
flow transducers rated for operation up to 375°F. We also manufacture Very High (VH) temperature
transducers for applications where the temperature exceeds 375°F, but is less than 450°F. Please refer
to the Flow Tube Appendix for flow tube pressure and temperature ratings.
5.5 OVERVIEW OF THE FUE1010EN MEMORY RESOURCE
S
The FUE1010EN memory resources include both Read-Only-Memory (ROM) and battery-backed Ran-
dom Access Memory (RAM). The ROM memory contains the system operating instructions, on-line help
text, default data, and the pipe, transducer and liquid 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. Sec-
ond, this creates an immediate Site Setup, based on the meter's defaults. To make the meter opera-
tional, you just have to enter required data (e.g., pipe and transducer data) and edit other default
settings to suit your application. When you program the meter, all your entries are retained in the Active
Memory. This enables you to use the meter immediately after finishing a Site Setup. You're not limited to
one set of site parameters. You can copy site data from Active Memory to Site Storage Memory.
Site Storage Memory provides permanent storage area for several inactive Site Setups. The multi-site
storage feature allows rapid reinstallation at many 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 be-
tween 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
dependent on the demands of each facility. Therefore, an unusually large Datalogger file may reduce the
amount of site storage memory available. Storing several inactive site setups may reduce the available
logging capacity.
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