5-6
1010PVNFM-3A
Section 5
NOTE: Before performing the installation routine, allow enough time for the liquid to
flush out all air trapped in the pipe.
5.4.7 SLURRIES
High-density undissolved solids (e.g., sand slurry) may cause application problems if
present in sufficient quantity to scatter the sonic beam significantly. Low-density solids,
such as organic materials, coal slurries and unaerated sewage sludge, are usually adequate
sonic conductors and their sonic impedance is very close to most liquids. Excessive mineral
solids though could trigger the aeration alarm.
5.4.8 TWO-PHASE LIQUIDS
Two-phase liquids (e.g., oil and water) cause some sonic beam scattering. However, these usu-
ally conduct 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 operational 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 sufficiently conductive for acceptable operation. A low Valc % value usu-
ally 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 Section 6 for flow tube pressure and temperature rat-
ings.
5.5
OVERVIEW OF SYSTEM 1010PVN MEMORY RESOURCES
The System1010PVN memory resources include both Read-Only-Memory (ROM) and battery-
backed Random Access Memory (RAM). The ROM memory contains the system operating in-
structions, on-line help text, default data, and the pipe, transducer and liquid tables.
The flowmeter uses 1 Mega byte of RAM (standard) to provide three discrete storage func-
tions:
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 in-
creases performance. Second, this creates an immediate Site Setup, based on the meter’s de-
faults. To make the meter operational, 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 param-
eters. 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
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